<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.costar.com/role/Acquisition" xlink:href="csgp-20131231.xsd#Acquisition" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/AcquisitionDetails" xlink:href="csgp-20131231.xsd#AcquisitionDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/AcquisitionScheduleOfAssetsAcquiredAndLiabilitiesAssumedOfLoopnetAcquisitionDetails" xlink:href="csgp-20131231.xsd#AcquisitionScheduleOfAssetsAcquiredAndLiabilitiesAssumedOfLoopnetAcquisitionDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/AcquisitionScheduleOfConsiderationPaidToAquireLoopnetDetails" xlink:href="csgp-20131231.xsd#AcquisitionScheduleOfConsiderationPaidToAquireLoopnetDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/AcquisitionTables" xlink:href="csgp-20131231.xsd#AcquisitionTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/CommitmentsAndContingencies" xlink:href="csgp-20131231.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/CommitmentsAndContingenciesDetails" xlink:href="csgp-20131231.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/CommitmentsAndContingenciesTables" xlink:href="csgp-20131231.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ConsolidatedBalanceSheets" xlink:href="csgp-20131231.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="csgp-20131231.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="csgp-20131231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:href="csgp-20131231.xsd#ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ConsolidatedStatementsOfOperations" xlink:href="csgp-20131231.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:href="csgp-20131231.xsd#ConsolidatedStatementsOfStockholdersEquity" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/DocumentAndEntityInformationDocumentAndEntityInformation" xlink:href="csgp-20131231.xsd#DocumentAndEntityInformationDocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/EmployeeBenefitPlans" xlink:href="csgp-20131231.xsd#EmployeeBenefitPlans" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/EmployeeBenefitPlansDetails" xlink:href="csgp-20131231.xsd#EmployeeBenefitPlansDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/EmployeeBenefitPlansTables" xlink:href="csgp-20131231.xsd#EmployeeBenefitPlansTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/FairValue" xlink:href="csgp-20131231.xsd#FairValue" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/FairValueDetails" xlink:href="csgp-20131231.xsd#FairValueDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/FairValueTables" xlink:href="csgp-20131231.xsd#FairValueTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/Goodwill" xlink:href="csgp-20131231.xsd#Goodwill" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/GoodwillDetails" xlink:href="csgp-20131231.xsd#GoodwillDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/GoodwillTables" xlink:href="csgp-20131231.xsd#GoodwillTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/IncomeTaxes" xlink:href="csgp-20131231.xsd#IncomeTaxes" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/IncomeTaxesDetails" xlink:href="csgp-20131231.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/IncomeTaxesTables" xlink:href="csgp-20131231.xsd#IncomeTaxesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/IntangiblesAndOtherAssets" xlink:href="csgp-20131231.xsd#IntangiblesAndOtherAssets" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/IntangiblesAndOtherAssetsDetails" xlink:href="csgp-20131231.xsd#IntangiblesAndOtherAssetsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/IntangiblesAndOtherAssetsTables" xlink:href="csgp-20131231.xsd#IntangiblesAndOtherAssetsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/Investments" xlink:href="csgp-20131231.xsd#Investments" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/InvestmentsAvailableForSaleSecuritiesDetails" xlink:href="csgp-20131231.xsd#InvestmentsAvailableForSaleSecuritiesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/InvestmentsDetails" xlink:href="csgp-20131231.xsd#InvestmentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/InvestmentsTables" xlink:href="csgp-20131231.xsd#InvestmentsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/LongTermDebt" xlink:href="csgp-20131231.xsd#LongTermDebt" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/LongTermDebtDetails" xlink:href="csgp-20131231.xsd#LongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/LongTermDebtScheduleOfMaturitiesOfLongTermDebtDetails" xlink:href="csgp-20131231.xsd#LongTermDebtScheduleOfMaturitiesOfLongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/LongTermDebtTables" xlink:href="csgp-20131231.xsd#LongTermDebtTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/NetIncomePerShare" xlink:href="csgp-20131231.xsd#NetIncomePerShare" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/NetIncomePerShareDetails" xlink:href="csgp-20131231.xsd#NetIncomePerShareDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/NetIncomePerShareTables" xlink:href="csgp-20131231.xsd#NetIncomePerShareTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/Organization" xlink:href="csgp-20131231.xsd#Organization" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/OrganizationDetails" xlink:href="csgp-20131231.xsd#OrganizationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/PropertyAndEquipment" xlink:href="csgp-20131231.xsd#PropertyAndEquipment" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/PropertyAndEquipmentDetails" xlink:href="csgp-20131231.xsd#PropertyAndEquipmentDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/PropertyAndEquipmentTables" xlink:href="csgp-20131231.xsd#PropertyAndEquipmentTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ScheduleIiValuationAndQualifyingAccounts" xlink:href="csgp-20131231.xsd#ScheduleIiValuationAndQualifyingAccounts" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ScheduleIiValuationAndQualifyingAccountsDetails" xlink:href="csgp-20131231.xsd#ScheduleIiValuationAndQualifyingAccountsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/ScheduleIiValuationAndQualifyingAccountsTables" xlink:href="csgp-20131231.xsd#ScheduleIiValuationAndQualifyingAccountsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SegmentReporting" xlink:href="csgp-20131231.xsd#SegmentReporting" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SegmentReportingDetails" xlink:href="csgp-20131231.xsd#SegmentReportingDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SegmentReportingTables" xlink:href="csgp-20131231.xsd#SegmentReportingTables" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/StockholdersEquity" xlink:href="csgp-20131231.xsd#StockholdersEquity" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/StockholdersEquityDetails" xlink:href="csgp-20131231.xsd#StockholdersEquityDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="csgp-20131231.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesAccumulatedOtherComprehensiveIncomeLossNetOfTaxDetails" xlink:href="csgp-20131231.xsd#SummaryOfSignificantAccountingPoliciesAccumulatedOtherComprehensiveIncomeLossNetOfTaxDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:href="csgp-20131231.xsd#SummaryOfSignificantAccountingPoliciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="csgp-20131231.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesStockBasedCompensationExpenseDetails" xlink:href="csgp-20131231.xsd#SummaryOfSignificantAccountingPoliciesStockBasedCompensationExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="csgp-20131231.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" xlink:type="simple" />
  <roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" xlink:type="simple" />
  <presentationLink xlink:role="http://www.costar.com/role/Acquisition" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_DDCDF67F438BC1E0A53E1D7E090924BD" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationDisclosureTextBlock" xlink:label="loc_us-gaap_BusinessCombinationDisclosureTextBlock_AB807E5D976056EFDB3D1D7E09093882" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_DDCDF67F438BC1E0A53E1D7E090924BD" xlink:to="loc_us-gaap_BusinessCombinationDisclosureTextBlock_AB807E5D976056EFDB3D1D7E09093882" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/AcquisitionDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_4204B36E98E5778EFAB12BA72D0CDFCF" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACF3CF2998FE1F5BEEB22BA72D0CD751" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_4204B36E98E5778EFAB12BA72D0CDFCF" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACF3CF2998FE1F5BEEB22BA72D0CD751" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_CB2FA6279161E0A232632BA72D0C1077" xlink:type="locator" />
    <presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACF3CF2998FE1F5BEEB22BA72D0CD751" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_CB2FA6279161E0A232632BA72D0C1077" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C6089F326B55CDFC846C2BA72D0C0814" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_CB2FA6279161E0A232632BA72D0C1077" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C6089F326B55CDFC846C2BA72D0C0814" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CustomerContractsMember" xlink:label="loc_us-gaap_CustomerContractsMember_0B2F6D73204CF32858022BA72D0CA456" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C6089F326B55CDFC846C2BA72D0C0814" xlink:to="loc_us-gaap_CustomerContractsMember_0B2F6D73204CF32858022BA72D0CA456" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DatabasesMember" xlink:label="loc_us-gaap_DatabasesMember_8EA6945052863C5C187A2BA72D0C20DB" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C6089F326B55CDFC846C2BA72D0C0814" xlink:to="loc_us-gaap_DatabasesMember_8EA6945052863C5C187A2BA72D0C20DB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8415911470B292AB67542BA72D0C9609" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACF3CF2998FE1F5BEEB22BA72D0CD751" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8415911470B292AB67542BA72D0C9609" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_A56CE6BFE21296DAFC592BA72D0CDD6E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8415911470B292AB67542BA72D0C9609" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_A56CE6BFE21296DAFC592BA72D0CDD6E" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_6BA1E7877C4443F982482BA72D0C07AD" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_A56CE6BFE21296DAFC592BA72D0CDD6E" xlink:to="loc_csgp_LoopnetMember_6BA1E7877C4443F982482BA72D0C07AD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACF3CF2998FE1F5BEEB22BA72D0CD751" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_6324630C6F99CE2AE2452BA72D0CFA98" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_6324630C6F99CE2AE2452BA72D0CFA98" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_NumberOfDistinctIntangibleAsset" xlink:label="loc_csgp_NumberOfDistinctIntangibleAsset_F51B9826C94C98A79E3A2BA72D0C614E" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_csgp_NumberOfDistinctIntangibleAsset_F51B9826C94C98A79E3A2BA72D0C614E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_70C9F33196EC909A629E2BA72D0CEE69" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_70C9F33196EC909A629E2BA72D0CEE69" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BusinessCombinationRecognizedGoodwillAcquired" xlink:label="loc_csgp_BusinessCombinationRecognizedGoodwillAcquired_C979E313C301D2C047322BA72D0C7552" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_csgp_BusinessCombinationRecognizedGoodwillAcquired_C979E313C301D2C047322BA72D0C7552" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_2670026FC75FBCF58E472BA72D0C658B" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_2670026FC75FBCF58E472BA72D0C658B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_9026DD706530D4B856702BA72D0CA740" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_9026DD706530D4B856702BA72D0CA740" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_TermOfConsentOrderPublicCommentPeriod" xlink:label="loc_csgp_TermOfConsentOrderPublicCommentPeriod_0E21CFF1E3F987CAEC732BA72D0C40B6" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_csgp_TermOfConsentOrderPublicCommentPeriod_0E21CFF1E3F987CAEC732BA72D0C40B6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromSaleOfInvestmentProjects" xlink:label="loc_us-gaap_ProceedsFromSaleOfInvestmentProjects_BDCF3537149C31F87AF02BA72D0C268C" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_us-gaap_ProceedsFromSaleOfInvestmentProjects_BDCF3537149C31F87AF02BA72D0C268C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnSaleOfOtherInvestments" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherInvestments_1ABF57365A37E9B78E922BA72D0C2C33" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_849779FB815C8FE15B162BA72D0CB38C" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherInvestments_1ABF57365A37E9B78E922BA72D0C2C33" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/AcquisitionScheduleOfAssetsAcquiredAndLiabilitiesAssumedOfLoopnetAcquisitionDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_EE1A8C20FEEEBA20DB9C1D7E09095E0F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6B17B0C32AF183316B631D7E0909D77A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_EE1A8C20FEEEBA20DB9C1D7E09095E0F" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6B17B0C32AF183316B631D7E0909D77A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_0CAD269DDF958AD38F3D1D7E0909C76D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6B17B0C32AF183316B631D7E0909D77A" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_0CAD269DDF958AD38F3D1D7E0909C76D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_92F49579CFE33D9ECEE71D7E0909E1A9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0CAD269DDF958AD38F3D1D7E0909C76D" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_92F49579CFE33D9ECEE71D7E0909E1A9" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_C92880D05715AFD3954B1D7E09093486" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_92F49579CFE33D9ECEE71D7E0909E1A9" xlink:to="loc_csgp_LoopnetMember_C92880D05715AFD3954B1D7E09093486" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6B17B0C32AF183316B631D7E0909D77A" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_2D3980A1DCF97A7988191D7E0909FC52" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_2D3980A1DCF97A7988191D7E0909FC52" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_2E6EBC5BCA5F09DD12A11D7E09098B48" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_2E6EBC5BCA5F09DD12A11D7E09098B48" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BusinessCombinationRecognizedGoodwillAcquired" xlink:label="loc_csgp_BusinessCombinationRecognizedGoodwillAcquired_D72DBA6A65A446490F0B1D7E090979D0" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_csgp_BusinessCombinationRecognizedGoodwillAcquired_D72DBA6A65A446490F0B1D7E090979D0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets_AC676A4B77734FC036B81D7E0909F015" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets_AC676A4B77734FC036B81D7E0909F015" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BusinessAcquisitionPurchasePriceAllocationAcquiredCustomerBase" xlink:label="loc_csgp_BusinessAcquisitionPurchasePriceAllocationAcquiredCustomerBase_67B188ABDEEA0D1DFF0A1D7E0909EA82" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_csgp_BusinessAcquisitionPurchasePriceAllocationAcquiredCustomerBase_67B188ABDEEA0D1DFF0A1D7E0909EA82" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BusinessAcquisitionPurchasePriceAllocationAcquiredDatabaseTechnology" xlink:label="loc_csgp_BusinessAcquisitionPurchasePriceAllocationAcquiredDatabaseTechnology_AED003B5DF88ABC67D591D7E090965E9" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_csgp_BusinessAcquisitionPurchasePriceAllocationAcquiredDatabaseTechnology_AED003B5DF88ABC67D591D7E090965E9" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxAssetsandLiabilitiesNet" xlink:label="loc_csgp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxAssetsandLiabilitiesNet_9303D58319100329AD7E1D7E0909E781" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_csgp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxAssetsandLiabilitiesNet_9303D58319100329AD7E1D7E0909E781" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BusinessAcquisitionPurchasePriceAllocationOtherAssetsAndLiabilities" xlink:label="loc_csgp_BusinessAcquisitionPurchasePriceAllocationOtherAssetsAndLiabilities_0C9D15C8F93AD02F57A81D7E0909013F" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_csgp_BusinessAcquisitionPurchasePriceAllocationOtherAssetsAndLiabilities_0C9D15C8F93AD02F57A81D7E0909013F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_C321C6D96D6DFEB803931D7E0909794B" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FD2465F64B25B5E2E9A91D7E0909E7F4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_C321C6D96D6DFEB803931D7E0909794B" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/AcquisitionScheduleOfConsiderationPaidToAquireLoopnetDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_92581609F37095BFC2AC1D7E09093A55" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15A09E9FA3F2C8FC60AA1D7E09094427" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_92581609F37095BFC2AC1D7E09093A55" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15A09E9FA3F2C8FC60AA1D7E09094427" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5815A2121D06B9FC3FEA1D7E0909C1B9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15A09E9FA3F2C8FC60AA1D7E09094427" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5815A2121D06B9FC3FEA1D7E0909C1B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61CEF8DC117F75121B9D1D7E09093188" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5815A2121D06B9FC3FEA1D7E0909C1B9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61CEF8DC117F75121B9D1D7E09093188" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_33E05E4ACCE94F7589341D7E0909AD9C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61CEF8DC117F75121B9D1D7E09093188" xlink:to="loc_csgp_LoopnetMember_33E05E4ACCE94F7589341D7E0909AD9C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_1ECB3C9941008C815ACA1D7E0909EAA4" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15A09E9FA3F2C8FC60AA1D7E09094427" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_1ECB3C9941008C815ACA1D7E0909EAA4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_A78FA3483CEE001779381D7E09099D28" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_1ECB3C9941008C815ACA1D7E0909EAA4" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_A78FA3483CEE001779381D7E09099D28" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_8E1BFAF4102E4238C90E1D7E09094E13" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_1ECB3C9941008C815ACA1D7E0909EAA4" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_8E1BFAF4102E4238C90E1D7E09094E13" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionSharePrice" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_EEB6005E547E60216D031D7E09091616" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_1ECB3C9941008C815ACA1D7E0909EAA4" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_EEB6005E547E60216D031D7E09091616" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_23512CA8C3361F6BB47A1D7E0909E2DD" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_1ECB3C9941008C815ACA1D7E0909EAA4" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_23512CA8C3361F6BB47A1D7E0909E2DD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_D9A98B6BEA39202639971D7E0909DC2E" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_1ECB3C9941008C815ACA1D7E0909EAA4" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_D9A98B6BEA39202639971D7E0909DC2E" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/AcquisitionTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_4C10C63B9D6BDDE70B851D7E0909D7DC" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ECE78E274C8DFB37F5DB1D7E09090AA2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_4C10C63B9D6BDDE70B851D7E0909D7DC" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ECE78E274C8DFB37F5DB1D7E09090AA2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8B76A4A79A1068FDC9501D7E09097690" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ECE78E274C8DFB37F5DB1D7E09090AA2" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8B76A4A79A1068FDC9501D7E09097690" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3E7CA0412BEE2827F451D7E09097466" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8B76A4A79A1068FDC9501D7E09097690" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3E7CA0412BEE2827F451D7E09097466" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_0D6BF18ED8A9253D74971D7E09093899" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3E7CA0412BEE2827F451D7E09097466" xlink:to="loc_csgp_LoopnetMember_0D6BF18ED8A9253D74971D7E09093899" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_397E70FAC1D87999DCE61D7E0909088F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ECE78E274C8DFB37F5DB1D7E09090AA2" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_397E70FAC1D87999DCE61D7E0909088F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock_899A753383B7D2FD50201D7E0909C342" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_397E70FAC1D87999DCE61D7E0909088F" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock_899A753383B7D2FD50201D7E0909C342" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_4C6FD8AAAFDB890A10471D7E09092260" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_397E70FAC1D87999DCE61D7E0909088F" xlink:to="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_4C6FD8AAAFDB890A10471D7E09092260" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/CommitmentsAndContingencies" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_0365A1236C85173E9F3CFF4B56A905FE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_192BD537B2D1102B3EAFFF4B56A99CAE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_0365A1236C85173E9F3CFF4B56A905FE" xlink:to="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_192BD537B2D1102B3EAFFF4B56A99CAE" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/CommitmentsAndContingenciesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_796131537CFC07428CD22BA72CAF71D2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesRentExpenseAbstract" xlink:label="loc_us-gaap_OperatingLeasesRentExpenseAbstract_19F131F0B3529EE3CFE32BA72CAF1F37" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_796131537CFC07428CD22BA72CAF71D2" xlink:to="loc_us-gaap_OperatingLeasesRentExpenseAbstract_19F131F0B3529EE3CFE32BA72CAF1F37" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesRentExpenseNet" xlink:label="loc_us-gaap_OperatingLeasesRentExpenseNet_C55D035CD82612FA7E692BA72CAF4888" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesRentExpenseAbstract_19F131F0B3529EE3CFE32BA72CAF1F37" xlink:to="loc_us-gaap_OperatingLeasesRentExpenseNet_C55D035CD82612FA7E692BA72CAF4888" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_796131537CFC07428CD22BA72CAF71D2" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_7BAABED969222D8B34E32BA72CAF36DB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_7BAABED969222D8B34E32BA72CAF36DB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_1C22A0F097E83297F56A2BA72CAF3D55" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_1C22A0F097E83297F56A2BA72CAF3D55" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_EE5687AEF987A228416F2BA72CAF4D65" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_EE5687AEF987A228416F2BA72CAF4D65" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_36E577C77438AA3A2C3B2BA72CAF1D19" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_36E577C77438AA3A2C3B2BA72CAF1D19" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AD89305E46BF0DF21FD62BA72CAF421B" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AD89305E46BF0DF21FD62BA72CAF421B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_C24E49E2607E952C0D5E2BA72CAFAB08" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_C24E49E2607E952C0D5E2BA72CAFAB08" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_C1437AD42CA14226BBB42BA72CAF2E64" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_423F27D9C74D5E2CEFB02BA72CAFF1D1" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_C1437AD42CA14226BBB42BA72CAF2E64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3A731A3887CEBADF592B2BA72CAF0817" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_796131537CFC07428CD22BA72CAF71D2" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3A731A3887CEBADF592B2BA72CAF0817" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8B89633819D519420A5E2BA72CAFC340" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3A731A3887CEBADF592B2BA72CAF0817" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8B89633819D519420A5E2BA72CAFC340" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1C279DAE73871466E3952BA72CAFDBAF" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8B89633819D519420A5E2BA72CAFC340" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1C279DAE73871466E3952BA72CAFDBAF" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_0850CC9AE291F5E566812BA72CAF989A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1C279DAE73871466E3952BA72CAFDBAF" xlink:to="loc_csgp_LoopnetMember_0850CC9AE291F5E566812BA72CAF989A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LitigationCaseAxis" xlink:label="loc_us-gaap_LitigationCaseAxis_1BD4A7F6655665C4ADDB2BA72CAF8388" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3A731A3887CEBADF592B2BA72CAF0817" xlink:to="loc_us-gaap_LitigationCaseAxis_1BD4A7F6655665C4ADDB2BA72CAF8388" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_488C667D8E70478B3F1F2BA72CAF4132" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LitigationCaseAxis_1BD4A7F6655665C4ADDB2BA72CAF8388" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_488C667D8E70478B3F1F2BA72CAF4132" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopNetStockholdersMember" xlink:label="loc_csgp_LoopNetStockholdersMember_7092084FD2594264A8F92BA72CAFB328" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_488C667D8E70478B3F1F2BA72CAF4132" xlink:to="loc_csgp_LoopNetStockholdersMember_7092084FD2594264A8F92BA72CAFB328" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_CivixMember" xlink:label="loc_csgp_CivixMember_84A4932778DCE0A4E1F82BA72CAF6597" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_488C667D8E70478B3F1F2BA72CAF4132" xlink:to="loc_csgp_CivixMember_84A4932778DCE0A4E1F82BA72CAF6597" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_B5708FEC94E0ADFD22072BA72CAF8F71" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3A731A3887CEBADF592B2BA72CAF0817" xlink:to="loc_dei_LegalEntityAxis_B5708FEC94E0ADFD22072BA72CAF8F71" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_E5AC3A6A8AB1CFCDAC222BA72CAFCA4C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_B5708FEC94E0ADFD22072BA72CAF8F71" xlink:to="loc_dei_EntityDomain_E5AC3A6A8AB1CFCDAC222BA72CAFCA4C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="loc_us-gaap_ParentCompanyMember_43D238D655764A2AF86C2BA72CAF4C14" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_E5AC3A6A8AB1CFCDAC222BA72CAFCA4C" xlink:to="loc_us-gaap_ParentCompanyMember_43D238D655764A2AF86C2BA72CAF4C14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_56AC88B7AFFA5612CAA72BA72CAF47E8" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3A731A3887CEBADF592B2BA72CAF0817" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_56AC88B7AFFA5612CAA72BA72CAF47E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4860DCE150ADD6F302682BA72CAFB3AD" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_56AC88B7AFFA5612CAA72BA72CAF47E8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4860DCE150ADD6F302682BA72CAFB3AD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMember" xlink:label="loc_us-gaap_LongTermDebtMember_F05F4D425E26D26667572BA72CAF8FCB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4860DCE150ADD6F302682BA72CAFB3AD" xlink:to="loc_us-gaap_LongTermDebtMember_F05F4D425E26D26667572BA72CAF8FCB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_9353519CB104202B4D4E2BA72CAFC61F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4860DCE150ADD6F302682BA72CAFB3AD" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_9353519CB104202B4D4E2BA72CAFC61F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3A731A3887CEBADF592B2BA72CAF0817" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_0756D9C8AE84DA8B62C82BA72CAFEDB6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:to="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_0756D9C8AE84DA8B62C82BA72CAFEDB6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_36169F372696C1D57EA82BA72CAFD2AE" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:to="loc_us-gaap_DebtInstrumentTerm_36169F372696C1D57EA82BA72CAFD2AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyNewClaimsFiledNumber" xlink:label="loc_us-gaap_LossContingencyNewClaimsFiledNumber_3415EA8D9C6F3F97A5D12BA72CAF3CBB" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:to="loc_us-gaap_LossContingencyNewClaimsFiledNumber_3415EA8D9C6F3F97A5D12BA72CAF3CBB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_11635B65362D58079D2C2BA72CAFF42E" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_11635B65362D58079D2C2BA72CAFF42E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_557036D51373FDCA63692BA72CAFF1C1" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_557036D51373FDCA63692BA72CAFF1C1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_5441A52D0D51C1D72CA12BA72CAF8DF8" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_5441A52D0D51C1D72CA12BA72CAF8DF8" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_MinimumNumberOfCurrentLitigationMatters" xlink:label="loc_csgp_MinimumNumberOfCurrentLitigationMatters_CDC126BEBCAB9FAE85F02BA72CAF271E" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_E6FBE71537B152FA29D92BA72CAFA8E6" xlink:to="loc_csgp_MinimumNumberOfCurrentLitigationMatters_CDC126BEBCAB9FAE85F02BA72CAF271E" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/CommitmentsAndContingenciesTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_D92454A6DF8A8701F9BAFF4B57077CA9" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_32FF13C2BADF1D20334EFF4B570733AE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_D92454A6DF8A8701F9BAFF4B57077CA9" xlink:to="loc_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_32FF13C2BADF1D20334EFF4B570733AE" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_DA924EEA484D248565ADEA13518D3830" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_DA924EEA484D248565ADEA13518D3830" xlink:to="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:to="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_C14F495684FF657BC933EA13518D6A95" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_C14F495684FF657BC933EA13518D6A95" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_D9E4D125868AC9F17F74EA13518DBE3F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:to="loc_us-gaap_ShortTermInvestments_D9E4D125868AC9F17F74EA13518DBE3F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_546104AED8CB8A603420EA13518D201F" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_546104AED8CB8A603420EA13518D201F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_DF7086C7B48A9E84F168EA13518D5CB1" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:to="loc_us-gaap_DeferredTaxAssetsNetCurrent_DF7086C7B48A9E84F168EA13518D5CB1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxesReceivable" xlink:label="loc_us-gaap_IncomeTaxesReceivable_AE22CB662D23F6EF72A0EA13518D1F20" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:to="loc_us-gaap_IncomeTaxesReceivable_AE22CB662D23F6EF72A0EA13518D1F20" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_B01523134E7318154350EA13518D61A3" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_B01523134E7318154350EA13518D61A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredCostsCurrent" xlink:label="loc_us-gaap_DeferredCostsCurrent_8E8C4935537B87B0435EEA13518DEF10" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:to="loc_us-gaap_DeferredCostsCurrent_8E8C4935537B87B0435EEA13518DEF10" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_65B2EAFE2D6871CA2EE5EA13518D4004" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1C78ED7455C0F0BFFBAAEA13518D8CCC" xlink:to="loc_us-gaap_AssetsCurrent_65B2EAFE2D6871CA2EE5EA13518D4004" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="loc_us-gaap_LongTermInvestments_EE43539E5E08ECD0CC7EEA13518D61FA" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:to="loc_us-gaap_LongTermInvestments_EE43539E5E08ECD0CC7EEA13518D61FA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_3341D4595EF6FFAD5249EA13518DD2B5" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_3341D4595EF6FFAD5249EA13518DD2B5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_29FC58119DC115BEF1C0EA13518D08C7" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:to="loc_us-gaap_Goodwill_29FC58119DC115BEF1C0EA13518D08C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_AC194433B8FB1174A7D0EA13518D26C9" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_AC194433B8FB1174A7D0EA13518D26C9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepositsAssetsNoncurrent" xlink:label="loc_us-gaap_DepositsAssetsNoncurrent_B3DF61745AE950514108EA13518DA771" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:to="loc_us-gaap_DepositsAssetsNoncurrent_B3DF61745AE950514108EA13518DA771" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredCosts" xlink:label="loc_us-gaap_DeferredCosts_A425F03FE2B37118605EEA13518D0CB7" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:to="loc_us-gaap_DeferredCosts_A425F03FE2B37118605EEA13518D0CB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_ACACF95697EF0858FE00EA13518DD354" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_7285550BD1A6DCBDF67EEA13518D61EB" xlink:to="loc_us-gaap_Assets_ACACF95697EF0858FE00EA13518DD354" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_DA924EEA484D248565ADEA13518D3830" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_D84BC6D4B041B636ADEDEA13518DDE1F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:to="loc_us-gaap_LongTermDebtCurrent_D84BC6D4B041B636ADEDEA13518DDE1F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_D568F47EFA8AB7FDC01EEA13518D061B" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:to="loc_us-gaap_AccountsPayableCurrent_D568F47EFA8AB7FDC01EEA13518D061B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_A6B9B1FF1E64A3B71ABEEA13518D70C8" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_A6B9B1FF1E64A3B71ABEEA13518D70C8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_4FE9C0D58663678B849DEA13518DC7FB" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_4FE9C0D58663678B849DEA13518DC7FB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredGainOnSaleOfProperty" xlink:label="loc_us-gaap_DeferredGainOnSaleOfProperty_A3802F9052DA071998D1EA13518D8C3C" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:to="loc_us-gaap_DeferredGainOnSaleOfProperty_A3802F9052DA071998D1EA13518D8C3C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_0A7EEAB2581FA9C19CA2EA13518DB2BF" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_0A7EEAB2581FA9C19CA2EA13518DB2BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_626EA7E0FE1D2B401686EA13518DB0BF" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:to="loc_us-gaap_DeferredRevenueCurrent_626EA7E0FE1D2B401686EA13518DB0BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_9E0D01EB94B8546840E5EA13518D9D0B" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28D29A39304BEECD9DA9EA13518D7FBA" xlink:to="loc_us-gaap_LiabilitiesCurrent_9E0D01EB94B8546840E5EA13518D9D0B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_41DB6D9F439725101914EA13518D90AE" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_41DB6D9F439725101914EA13518D90AE" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_DeferredGainOnSaleOfBuildingNoncurrent" xlink:label="loc_csgp_DeferredGainOnSaleOfBuildingNoncurrent_3E71DC8CBD2DD2008F81EA13518D3F08" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_csgp_DeferredGainOnSaleOfBuildingNoncurrent_3E71DC8CBD2DD2008F81EA13518D3F08" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredRentCreditNoncurrent" xlink:label="loc_us-gaap_DeferredRentCreditNoncurrent_C45AA1AE95F2B2013C8CEA13518DC197" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_DeferredRentCreditNoncurrent_C45AA1AE95F2B2013C8CEA13518DC197" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_4B466399523A772FE95AEA13518DF0F4" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_4B466399523A772FE95AEA13518DF0F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedIncomeTaxesNoncurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_760E9531C0CBE476B05FEA13518DBC3A" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_760E9531C0CBE476B05FEA13518DBC3A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_C82F2F7D71B418AE2B92EA13518DF8C3" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_C82F2F7D71B418AE2B92EA13518DF8C3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_10A6C4B00B67A87CB6C0EA13518DDA5D" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_Liabilities_10A6C4B00B67A87CB6C0EA13518DDA5D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_B8E8293BFB5344E2A7BAEA13518D017A" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_CommitmentsAndContingencies_B8E8293BFB5344E2A7BAEA13518D017A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2CBA55B4642577ECF7F1EA13518D6757" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2CBA55B4642577ECF7F1EA13518D6757" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_A3503A116C22929837ABEA13518DDF3A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2CBA55B4642577ECF7F1EA13518D6757" xlink:to="loc_us-gaap_PreferredStockValue_A3503A116C22929837ABEA13518DDF3A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_64CEE967301E7E765342EA13518DBA0C" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2CBA55B4642577ECF7F1EA13518D6757" xlink:to="loc_us-gaap_CommonStockValue_64CEE967301E7E765342EA13518DBA0C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_2E6382861A94A1F534E8EA13518DBCEC" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2CBA55B4642577ECF7F1EA13518D6757" xlink:to="loc_us-gaap_AdditionalPaidInCapital_2E6382861A94A1F534E8EA13518DBCEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_067289C2AC294737BD03EA13518DDFD2" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2CBA55B4642577ECF7F1EA13518D6757" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_067289C2AC294737BD03EA13518DDFD2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_37D28654BBF1CF830100EA13518DFF07" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2CBA55B4642577ECF7F1EA13518D6757" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_37D28654BBF1CF830100EA13518DFF07" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_A7CE39895619E472E82CEA13518D10A1" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_2CBA55B4642577ECF7F1EA13518D6757" xlink:to="loc_us-gaap_StockholdersEquity_A7CE39895619E472E82CEA13518D10A1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_498024AA580CD106AA46EA13518D3FBF" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_FB6255193B1841F5A37DEA13518D9F37" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_498024AA580CD106AA46EA13518D3FBF" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_2BE8F4D20629B871F237FF4B56D88B13" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_7713AB301F90EA822A2BFF4B56D899F1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_2BE8F4D20629B871F237FF4B56D88B13" xlink:to="loc_us-gaap_StatementTable_7713AB301F90EA822A2BFF4B56D899F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_565069C3D2E6C89B698EFF4B56D8EA95" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_7713AB301F90EA822A2BFF4B56D899F1" xlink:to="loc_us-gaap_StatementScenarioAxis_565069C3D2E6C89B698EFF4B56D8EA95" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_606D57CFD20F9D6A858DFF4B56D8F55E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementScenarioAxis_565069C3D2E6C89B698EFF4B56D8EA95" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_606D57CFD20F9D6A858DFF4B56D8F55E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_7713AB301F90EA822A2BFF4B56D899F1" xlink:to="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_6741DF390F07373DC234FF4B56D893BE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_6741DF390F07373DC234FF4B56D893BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_71B532E6D51F5313ADF2FF4B56D85545" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_71B532E6D51F5313ADF2FF4B56D85545" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_AF8D633D32893EB7B503FF4B56D88AB4" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_AF8D633D32893EB7B503FF4B56D88AB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_C7423532488F072759B1FF4B56D8E1FA" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_C7423532488F072759B1FF4B56D8E1FA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_9902E73FC66A800977EFFF4B56D8D063" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_9902E73FC66A800977EFFF4B56D8D063" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_2EB960A09C57D1E12EECFF4B56D8AAE4" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_2EB960A09C57D1E12EECFF4B56D8AAE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_9656540B5272E939D5ECFF4B56D8D48F" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:to="loc_us-gaap_CommonStockSharesIssued_9656540B5272E939D5ECFF4B56D8D48F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_EC4F2679610C00935A60FF4B56D83B85" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_31C496B8291F9AEADE3CFF4B56D873E0" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_EC4F2679610C00935A60FF4B56D83B85" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_85A001AEB99CCFFEC4A42B8ADACB4F37" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_982B42FA8F293BD4A6272B8ADACD244E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_85A001AEB99CCFFEC4A42B8ADACB4F37" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_982B42FA8F293BD4A6272B8ADACD244E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_23B71353040787B821A12B8ADACED07E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_982B42FA8F293BD4A6272B8ADACD244E" xlink:to="loc_us-gaap_NetIncomeLoss_23B71353040787B821A12B8ADACED07E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_982B42FA8F293BD4A6272B8ADACD244E" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_4F9C2A5222A94DE0BD072B8ADAD03C33" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_us-gaap_Depreciation_4F9C2A5222A94DE0BD072B8ADAD03C33" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentForAmortization" xlink:label="loc_us-gaap_AdjustmentForAmortization_5B41A98D07576E54C47A2B8ADAD00EEF" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_us-gaap_AdjustmentForAmortization_5B41A98D07576E54C47A2B8ADAD00EEF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_65BF11BF0E70ADB772492B8ADAD07FAA" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_65BF11BF0E70ADB772492B8ADAD07FAA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_FFC8ACC6DDD1825B318C2B8ADAD05A46" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_FFC8ACC6DDD1825B318C2B8ADAD05A46" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_FC8B35A7B6C4182B61FD2B8ADAD14EAB" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_FC8B35A7B6C4182B61FD2B8ADAD14EAB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_674262A84054ECCF327F2B8ADAD1BE5F" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_us-gaap_ShareBasedCompensation_674262A84054ECCF327F2B8ADAD1BE5F" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BusinessAcquisitionDeferredConsiderationLiabilityReversal" xlink:label="loc_csgp_BusinessAcquisitionDeferredConsiderationLiabilityReversal_61B21C406E3A05177EF52B8ADAD1620A" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_csgp_BusinessAcquisitionDeferredConsiderationLiabilityReversal_61B21C406E3A05177EF52B8ADAD1620A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_2FFAF08652A8B93E690D2B8ADAD17FD4" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_2FFAF08652A8B93E690D2B8ADAD17FD4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_8B9089DF53D2976554A32B8ADAD1A5D3" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_42602F00C5AB16AD7E192B8ADACF1058" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_8B9089DF53D2976554A32B8ADAD1A5D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7C81DAF9234C9B12528C2B8ADAD1F17D" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_982B42FA8F293BD4A6272B8ADACD244E" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7C81DAF9234C9B12528C2B8ADAD1F17D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_4A950138086FBA78FB5F2B8ADAD18DF5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7C81DAF9234C9B12528C2B8ADAD1F17D" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_4A950138086FBA78FB5F2B8ADAD18DF5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_2DF899A0F90C3B5DFD7D2B8ADAD187D2" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7C81DAF9234C9B12528C2B8ADAD1F17D" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_2DF899A0F90C3B5DFD7D2B8ADAD187D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_CA612371E5934CA203CC2B8ADAD26A9E" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7C81DAF9234C9B12528C2B8ADAD1F17D" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_CA612371E5934CA203CC2B8ADAD26A9E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInDeposits" xlink:label="loc_us-gaap_IncreaseDecreaseInDeposits_E42F45FFB83B1CF7FDC62B8ADAD252C1" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7C81DAF9234C9B12528C2B8ADAD1F17D" xlink:to="loc_us-gaap_IncreaseDecreaseInDeposits_E42F45FFB83B1CF7FDC62B8ADAD252C1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E281B4BD7DB61C9203152B8ADAD229DE" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7C81DAF9234C9B12528C2B8ADAD1F17D" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E281B4BD7DB61C9203152B8ADAD229DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_E725EE401A7BD715F9C52B8ADAD290BD" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_7C81DAF9234C9B12528C2B8ADAD1F17D" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_E725EE401A7BD715F9C52B8ADAD290BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_8979F255350E76DC46052B8ADAD27923" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_982B42FA8F293BD4A6272B8ADACD244E" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_8979F255350E76DC46052B8ADAD27923" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8266154C93F301FDB3CF2B8ADAD25CBE" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_85A001AEB99CCFFEC4A42B8ADACB4F37" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8266154C93F301FDB3CF2B8ADAD25CBE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments_6649CA835C2800868BA12B8ADAD3573B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8266154C93F301FDB3CF2B8ADAD25CBE" xlink:to="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments_6649CA835C2800868BA12B8ADAD3573B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SaleLeasebackTransactionNetProceeds" xlink:label="loc_us-gaap_SaleLeasebackTransactionNetProceeds_F9350256966DE3B90DF52B8ADAD3FD8F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8266154C93F301FDB3CF2B8ADAD25CBE" xlink:to="loc_us-gaap_SaleLeasebackTransactionNetProceeds_F9350256966DE3B90DF52B8ADAD3FD8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_32E09BE9216F6678E0032B8ADAD3B83C" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8266154C93F301FDB3CF2B8ADAD25CBE" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_32E09BE9216F6678E0032B8ADAD3B83C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_8C44C5786CE715BBFD3B2B8ADAD329B2" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8266154C93F301FDB3CF2B8ADAD25CBE" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_8C44C5786CE715BBFD3B2B8ADAD329B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_6747782BD5F29455B43F2B8ADAD3913D" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_8266154C93F301FDB3CF2B8ADAD25CBE" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_6747782BD5F29455B43F2B8ADAD3913D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_85A001AEB99CCFFEC4A42B8ADACB4F37" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_508468330CF6A48190E22B8ADAD3A8F5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_508468330CF6A48190E22B8ADAD3A8F5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_8C267F403F390B196E362B8ADAD33E19" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_8C267F403F390B196E362B8ADAD33E19" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_2DE864A11B81CB575D2B2B8ADAD3060E" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_2DE864A11B81CB575D2B2B8ADAD3060E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_E2623AC78278B5A68F832B8ADAD3AA90" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_E2623AC78278B5A68F832B8ADAD3AA90" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_A83D92D31C10BF6413532B8ADAD3F8CC" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_A83D92D31C10BF6413532B8ADAD3F8CC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_26B64B0E61780510B2AE2B8ADAD3965C" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_26B64B0E61780510B2AE2B8ADAD3965C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_F46B70ADC2E81DDE40712B8ADAD3C97D" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_F46B70ADC2E81DDE40712B8ADAD3C97D" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ProceedsFromExerciseOfStockOptionsAndEspp" xlink:label="loc_csgp_ProceedsFromExerciseOfStockOptionsAndEspp_53C7C4263A8375BA35082B8ADAD32DF1" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_csgp_ProceedsFromExerciseOfStockOptionsAndEspp_53C7C4263A8375BA35082B8ADAD32DF1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_F84BFE1545DACF1FF99E2B8ADAD3E49A" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_2C1B4F9CA1936F5489F12B8ADAD3E766" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_F84BFE1545DACF1FF99E2B8ADAD3E49A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_962E0574DC3122B092A42B8ADAD3D061" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_85A001AEB99CCFFEC4A42B8ADACB4F37" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_962E0574DC3122B092A42B8ADAD3D061" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_33C270BC481BA9E7ADE12B8ADAD35DEA" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_85A001AEB99CCFFEC4A42B8ADACB4F37" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_33C270BC481BA9E7ADE12B8ADAD35DEA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_FBA9FBBABAF4A1F14F422B8ADAD4E289" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_85A001AEB99CCFFEC4A42B8ADACB4F37" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_FBA9FBBABAF4A1F14F422B8ADAD4E289" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DDF7DE94F1AE5F0ED3B82B8ADAD400F3" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_85A001AEB99CCFFEC4A42B8ADACB4F37" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DDF7DE94F1AE5F0ED3B82B8ADAD400F3" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_BC2DECEA12388BCAE3EC22365733C758" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_37221EBDA73F9E8844BE2236573346F7" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_BC2DECEA12388BCAE3EC22365733C758" xlink:to="loc_us-gaap_NetIncomeLoss_37221EBDA73F9E8844BE2236573346F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_EABA5FC38150181B51C1223657333DB7" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_BC2DECEA12388BCAE3EC22365733C758" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_EABA5FC38150181B51C1223657333DB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_02AFF39BBD6B07D0F48822365733C9FF" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_EABA5FC38150181B51C1223657333DB7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_02AFF39BBD6B07D0F48822365733C9FF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_99952B5FEF6BB2215C8922365733856C" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_EABA5FC38150181B51C1223657333DB7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_99952B5FEF6BB2215C8922365733856C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_A6202BE08B037E49048D223657333D6E" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_BC2DECEA12388BCAE3EC22365733C758" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_A6202BE08B037E49048D223657333D6E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_9DD54A6102890BECD50D223657339711" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_BC2DECEA12388BCAE3EC22365733C758" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_9DD54A6102890BECD50D223657339711" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_76B761A06E7FD3E9928EFF4B56C9B7E4" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_Revenues_76B761A06E7FD3E9928EFF4B56C9B7E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_66FA86AA0EC876C65D22FF4B56C958E5" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_CostOfRevenue_66FA86AA0EC876C65D22FF4B56C958E5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_C3DC3843C55EBE71625CFF4B56C9517D" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_GrossProfit_C3DC3843C55EBE71625CFF4B56C9517D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_5A0485D2201E47549AACFF4B56C9B366" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_OperatingExpensesAbstract_5A0485D2201E47549AACFF4B56C9B366" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_7D7F0103E4D35C87CCC6FF4B56C9B0FE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_5A0485D2201E47549AACFF4B56C9B366" xlink:to="loc_us-gaap_SellingAndMarketingExpense_7D7F0103E4D35C87CCC6FF4B56C9B0FE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost_FC0782A4DD2065C14B0BFF4B56C98450" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_5A0485D2201E47549AACFF4B56C9B366" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost_FC0782A4DD2065C14B0BFF4B56C98450" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_8522EF14C3B9BFF41BDCFF4B56C9007D" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_5A0485D2201E47549AACFF4B56C9B366" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_8522EF14C3B9BFF41BDCFF4B56C9007D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_89CA3F356DE96ABFF000FF4B56C983F7" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_5A0485D2201E47549AACFF4B56C9B366" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_89CA3F356DE96ABFF000FF4B56C983F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_3121E43B4E69DC89A1DDFF4B56C91756" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_5A0485D2201E47549AACFF4B56C9B366" xlink:to="loc_us-gaap_OperatingExpenses_3121E43B4E69DC89A1DDFF4B56C91756" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_EC101968BB85081F80A1FF4B56C9AC03" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_OperatingIncomeLoss_EC101968BB85081F80A1FF4B56C9AC03" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_FC8AD41A8A593D293D3FFF4B56C9FBC3" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_InvestmentIncomeInterest_FC8AD41A8A593D293D3FFF4B56C9FBC3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_3338E866D1C6B951906FFF4B56C97204" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_InterestExpense_3338E866D1C6B951906FFF4B56C97204" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_01C9E5F358E2C7F939C8FF4B56C929B0" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_01C9E5F358E2C7F939C8FF4B56C929B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_8573F6C5BD59D4E957FBFF4B56C98F7F" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_8573F6C5BD59D4E957FBFF4B56C98F7F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_F685E687218ECEE4BC4EFF4B56C98C98" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_NetIncomeLoss_F685E687218ECEE4BC4EFF4B56C98C98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_F64518DC1CEF121488BBFF4B56C98533" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_EarningsPerShareBasic_F64518DC1CEF121488BBFF4B56C98533" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_25B6E1CD14F40E03C3E0FF4B56C9C953" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_EarningsPerShareDiluted_25B6E1CD14F40E03C3E0FF4B56C9C953" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_92D10871B4B18FA08560FF4B56C96667" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_92D10871B4B18FA08560FF4B56C96667" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_80CC7D83770BE474BDE8FF4B56C98224" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_38F14C3E7AEB5902B7EBFF4B56C91BD2" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_80CC7D83770BE474BDE8FF4B56C98224" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_0363DDA698DC5D0E4D152253ED25C066" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_D1658AC306486E9EFF3A2253ED252029" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_0363DDA698DC5D0E4D152253ED25C066" xlink:to="loc_us-gaap_StatementTable_D1658AC306486E9EFF3A2253ED252029" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_E0D4C8683AAA001D601A2253ED25D35C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_D1658AC306486E9EFF3A2253ED252029" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_E0D4C8683AAA001D601A2253ED25D35C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_A1568B87C011E0F15FD72253ED2585F1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_E0D4C8683AAA001D601A2253ED25D35C" xlink:to="loc_us-gaap_EquityComponentDomain_A1568B87C011E0F15FD72253ED2585F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_9180C915F94234A7D55F2253ED257947" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_A1568B87C011E0F15FD72253ED2585F1" xlink:to="loc_us-gaap_CommonStockMember_9180C915F94234A7D55F2253ED257947" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_69C00DE718D85F2CDFC32253ED254273" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_A1568B87C011E0F15FD72253ED2585F1" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_69C00DE718D85F2CDFC32253ED254273" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_F9C4971A7D7BDA85A45B2253ED251370" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_A1568B87C011E0F15FD72253ED2585F1" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_F9C4971A7D7BDA85A45B2253ED251370" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_9E91DE0B4C387EE8FEDD2253ED25F0DA" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_A1568B87C011E0F15FD72253ED2585F1" xlink:to="loc_us-gaap_RetainedEarningsMember_9E91DE0B4C387EE8FEDD2253ED25F0DA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_D1658AC306486E9EFF3A2253ED252029" xlink:to="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_B5E7DCB0AE5F92B319A02253ED253E1C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_SharesOutstanding_B5E7DCB0AE5F92B319A02253ED253E1C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_DC1A21DB307F7B8D90192253ED254765" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockholdersEquity_DC1A21DB307F7B8D90192253ED254765" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_407B557A6743B6FEE07E2253ED25D893" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_NetIncomeLoss_407B557A6743B6FEE07E2253ED25D893" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_309CC7F75BA9D03B3A6A2253ED25E9FF" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_309CC7F75BA9D03B3A6A2253ED25E9FF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrealizedGainLossOnInvestments" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_727DD153519ED056E5FB2253ED251D1B" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_727DD153519ED056E5FB2253ED251D1B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_E6844BF5E4846F3B25C82253ED25A7AC" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_E6844BF5E4846F3B25C82253ED25A7AC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_C50696719CF7049BF8622253ED250C6D" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_C50696719CF7049BF8622253ED250C6D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_5BC33875E016810545BB2253ED25C3CE" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_5BC33875E016810545BB2253ED25C3CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_E418DB4A5F6BE900A5682253ED25E425" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_E418DB4A5F6BE900A5682253ED25E425" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_451FA0F78AE80F6375702253ED258135" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_451FA0F78AE80F6375702253ED258135" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_C36C583918C0941784D22253ED25054C" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_C36C583918C0941784D22253ED25054C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_EB529000F76F3F4F762B2253ED25E455" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_EB529000F76F3F4F762B2253ED25E455" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_866B8AAFA799D23270592253ED25FABC" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_866B8AAFA799D23270592253ED25FABC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_25A32A653AA2EEB495092253ED252CEB" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_25A32A653AA2EEB495092253ED252CEB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_6AC04D5B9B4530735B782253ED25E7F3" xlink:type="locator" />
    <presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_6AC04D5B9B4530735B782253ED25E7F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_02D2DC567CAA027713D02253ED25CBB7" xlink:type="locator" />
    <presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_02D2DC567CAA027713D02253ED25CBB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_FBAE63A92458D20A8F182253ED25A581" xlink:type="locator" />
    <presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_FBAE63A92458D20A8F182253ED25A581" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_EDCA0800DBFC0389FD132253ED252465" xlink:type="locator" />
    <presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_EDCA0800DBFC0389FD132253ED252465" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxExpenseFromStockOptionsExercised" xlink:label="loc_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_F0D3AAF38003CA45C6FE2253ED252C6E" xlink:type="locator" />
    <presentationArc order="19" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_F0D3AAF38003CA45C6FE2253ED252C6E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_96D5180634B5F7542EFF2253ED255141" xlink:type="locator" />
    <presentationArc order="20" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_SharesOutstanding_96D5180634B5F7542EFF2253ED255141" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_16D3B1A7E7C54352E18C2253ED252A03" xlink:type="locator" />
    <presentationArc order="21" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_26C242D2FF3F858CAC4C2253ED254F8B" xlink:to="loc_us-gaap_StockholdersEquity_16D3B1A7E7C54352E18C2253ED252A03" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/DocumentAndEntityInformationDocumentAndEntityInformation" xlink:type="extended">
    <loc xlink:href="csgp-20131231.xsd#csgp_DocumentAndEntityInformationAbstract" xlink:label="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_FEF46BE84EE6FAAEF260FF4B57073273" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_EntityRegistrantName_FEF46BE84EE6FAAEF260FF4B57073273" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_8497291DEF7CE01BA342FF4B57072AEC" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_EntityCentralIndexKey_8497291DEF7CE01BA342FF4B57072AEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_FA6399744979252A8510FF4B57079EA5" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_CurrentFiscalYearEndDate_FA6399744979252A8510FF4B57079EA5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_6A48C9EC424600820C91FF4B57070797" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_6A48C9EC424600820C91FF4B57070797" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_D40CAF36A000A5118A97FF4B57072690" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_EntityVoluntaryFilers_D40CAF36A000A5118A97FF4B57072690" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_75C61C1F9B7E171765FBFF4B5707F010" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_EntityCurrentReportingStatus_75C61C1F9B7E171765FBFF4B5707F010" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_32B556661351064F1938FF4B5707821E" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_EntityFilerCategory_32B556661351064F1938FF4B5707821E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_9A0CEA65E80BA85427CBFF4B57075C05" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_EntityPublicFloat_9A0CEA65E80BA85427CBFF4B57075C05" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_609DB18E5EF949B4C1D1FF4B5707A864" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_609DB18E5EF949B4C1D1FF4B5707A864" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_B9A751C914564F1DE711FF4B57074EEF" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_DocumentFiscalYearFocus_B9A751C914564F1DE711FF4B57074EEF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_BF91C1DFC09D4A5767D5FF4B5707B155" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_DocumentFiscalPeriodFocus_BF91C1DFC09D4A5767D5FF4B5707B155" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_19C1781D02D839606099FF4B5707DDD0" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_DocumentType_19C1781D02D839606099FF4B5707DDD0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_6AFC9CCFAB1835BD6396FF4B5707D68A" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_AmendmentFlag_6AFC9CCFAB1835BD6396FF4B5707D68A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_5E47464D89A54F652D2DFF4B570774D3" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_DocumentAndEntityInformationAbstract_8665880A43465893D84AFF4B57073AC7" xlink:to="loc_dei_DocumentPeriodEndDate_5E47464D89A54F652D2DFF4B570774D3" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/EmployeeBenefitPlans" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CompensationRelatedCostsAbstract" xlink:label="loc_us-gaap_CompensationRelatedCostsAbstract_EEE0A6D1BF0FC3D511DCFF4B5774ED4B" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_308CD49250FB429DB37AFF4B5774B590" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationRelatedCostsAbstract_EEE0A6D1BF0FC3D511DCFF4B5774ED4B" xlink:to="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_308CD49250FB429DB37AFF4B5774B590" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/EmployeeBenefitPlansDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CompensationRelatedCostsAbstract" xlink:label="loc_us-gaap_CompensationRelatedCostsAbstract_F61E2E915B4006749971408FC2E6C654" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4A0A391C960B0EE16854408FC2E6A973" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationRelatedCostsAbstract_F61E2E915B4006749971408FC2E6C654" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4A0A391C960B0EE16854408FC2E6A973" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_7E557E033A94678AB1AF408FC2E6CB6F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4A0A391C960B0EE16854408FC2E6A973" xlink:to="loc_us-gaap_RangeAxis_7E557E033A94678AB1AF408FC2E6CB6F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_C89AB1217BBEFDFB58A2408FC2E60BBB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeAxis_7E557E033A94678AB1AF408FC2E6CB6F" xlink:to="loc_us-gaap_RangeMember_C89AB1217BBEFDFB58A2408FC2E60BBB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_7BBD86ACAEBF20C4B792408FC2E6C04C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_C89AB1217BBEFDFB58A2408FC2E60BBB" xlink:to="loc_us-gaap_MinimumMember_7BBD86ACAEBF20C4B792408FC2E6C04C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_FBE73E1DCFB19C2FA10B408FC2E6AE50" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_C89AB1217BBEFDFB58A2408FC2E60BBB" xlink:to="loc_us-gaap_MaximumMember_FBE73E1DCFB19C2FA10B408FC2E6AE50" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_765A99EEDF8022D4F165408FC2E6DCB6" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4A0A391C960B0EE16854408FC2E6A973" xlink:to="loc_us-gaap_AwardTypeAxis_765A99EEDF8022D4F165408FC2E6DCB6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BED93BF1DF10D2ADCCF1408FC2E6F530" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_765A99EEDF8022D4F165408FC2E6DCB6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BED93BF1DF10D2ADCCF1408FC2E6F530" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_D19EA49C6F36331393CD408FC2F6260B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BED93BF1DF10D2ADCCF1408FC2E6F530" xlink:to="loc_us-gaap_EmployeeStockOptionMember_D19EA49C6F36331393CD408FC2F6260B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_659DE6F6F2306A5A9AEE408FC2F6DDCB" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BED93BF1DF10D2ADCCF1408FC2E6F530" xlink:to="loc_us-gaap_RestrictedStockMember_659DE6F6F2306A5A9AEE408FC2F6DDCB" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PerformanceBasedRestrictedCommonStockMember" xlink:label="loc_csgp_PerformanceBasedRestrictedCommonStockMember_8A435CA718848E5FD188408FC2F63F38" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BED93BF1DF10D2ADCCF1408FC2E6F530" xlink:to="loc_csgp_PerformanceBasedRestrictedCommonStockMember_8A435CA718848E5FD188408FC2F63F38" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_F9AED1FEBAB4791D1507408FC2F682B2" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4A0A391C960B0EE16854408FC2E6A973" xlink:to="loc_us-gaap_PlanNameAxis_F9AED1FEBAB4791D1507408FC2F682B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_295858FB64E040526882408FC2F61693" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_F9AED1FEBAB4791D1507408FC2F682B2" xlink:to="loc_us-gaap_PlanNameDomain_295858FB64E040526882408FC2F61693" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_StockIncentivePlan1998Member" xlink:label="loc_csgp_StockIncentivePlan1998Member_4843C3A23F5BFF8C14C7408FC2F68D2C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_295858FB64E040526882408FC2F61693" xlink:to="loc_csgp_StockIncentivePlan1998Member_4843C3A23F5BFF8C14C7408FC2F68D2C" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_CostarGroupInc2007StockIncentivePlanMember" xlink:label="loc_csgp_CostarGroupInc2007StockIncentivePlanMember_79A8F24657F563AC4AA7408FC2F6ECC2" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_295858FB64E040526882408FC2F61693" xlink:to="loc_csgp_CostarGroupInc2007StockIncentivePlanMember_79A8F24657F563AC4AA7408FC2F6ECC2" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_EmployeeStockPurchasePlanMember" xlink:label="loc_csgp_EmployeeStockPurchasePlanMember_DCD585F4B4DFE281F1BF408FC2F6FCAA" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_295858FB64E040526882408FC2F61693" xlink:to="loc_csgp_EmployeeStockPurchasePlanMember_DCD585F4B4DFE281F1BF408FC2F6FCAA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_DBA4544474FC77BC64F2408FC2F63E11" xlink:type="locator" />
    <presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4A0A391C960B0EE16854408FC2E6A973" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_DBA4544474FC77BC64F2408FC2F63E11" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:type="locator" />
    <presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_DBA4544474FC77BC64F2408FC2F63E11" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding1Member" xlink:label="loc_csgp_OptionsOutstanding1Member_046D9E451825322C392E408FC2F663DC" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding1Member_046D9E451825322C392E408FC2F663DC" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding2Member" xlink:label="loc_csgp_OptionsOutstanding2Member_BD50E0628CD55EFBF27D408FC2F6DD4A" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding2Member_BD50E0628CD55EFBF27D408FC2F6DD4A" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding3Member" xlink:label="loc_csgp_OptionsOutstanding3Member_DB09441F90FFA61363E9408FC2F63365" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding3Member_DB09441F90FFA61363E9408FC2F63365" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding4Member" xlink:label="loc_csgp_OptionsOutstanding4Member_1DC6079C5BC3B5A40D99408FC2F6E50E" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding4Member_1DC6079C5BC3B5A40D99408FC2F6E50E" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding5Member" xlink:label="loc_csgp_OptionsOutstanding5Member_9564E9711ECCB27FE2BD408FC2F62B60" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding5Member_9564E9711ECCB27FE2BD408FC2F62B60" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding6Member" xlink:label="loc_csgp_OptionsOutstanding6Member_5461532A33398F3A731A408FC2F612E5" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding6Member_5461532A33398F3A731A408FC2F612E5" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding7Member" xlink:label="loc_csgp_OptionsOutstanding7Member_96B566352079B5169E1F408FC2F6794E" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding7Member_96B566352079B5169E1F408FC2F6794E" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding8Member" xlink:label="loc_csgp_OptionsOutstanding8Member_CC4B93A53D7C8AAEFC11408FC2F66421" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding8Member_CC4B93A53D7C8AAEFC11408FC2F66421" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding9Member" xlink:label="loc_csgp_OptionsOutstanding9Member_5F03AD0432CC8FD616D6408FC2F619FA" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding9Member_5F03AD0432CC8FD616D6408FC2F619FA" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsOutstanding10Member" xlink:label="loc_csgp_OptionsOutstanding10Member_B44649C2EC22BAA2DBF6408FC2F6423D" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsOutstanding10Member_B44649C2EC22BAA2DBF6408FC2F6423D" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable1Member" xlink:label="loc_csgp_OptionsExercisable1Member_301AC9BB3E6AAE82F50E408FC2F6A637" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable1Member_301AC9BB3E6AAE82F50E408FC2F6A637" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable2Member" xlink:label="loc_csgp_OptionsExercisable2Member_41BA3347CA2ED91B8C7A408FC2F6603E" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable2Member_41BA3347CA2ED91B8C7A408FC2F6603E" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable3Member" xlink:label="loc_csgp_OptionsExercisable3Member_6E20B469A474561D1188408FC2F67B1F" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable3Member_6E20B469A474561D1188408FC2F67B1F" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable4Member" xlink:label="loc_csgp_OptionsExercisable4Member_5CE7D33615321290A0C5408FC2F6EEA8" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable4Member_5CE7D33615321290A0C5408FC2F6EEA8" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable5Member" xlink:label="loc_csgp_OptionsExercisable5Member_A693E3610DD5AEC88512408FC2F6CA2B" xlink:type="locator" />
    <presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable5Member_A693E3610DD5AEC88512408FC2F6CA2B" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable6Member" xlink:label="loc_csgp_OptionsExercisable6Member_8841A9438255DDA5063C408FC2F6E5E4" xlink:type="locator" />
    <presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable6Member_8841A9438255DDA5063C408FC2F6E5E4" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable7Member" xlink:label="loc_csgp_OptionsExercisable7Member_FF3D9DF2F46C2F1D9E83408FC2F612EF" xlink:type="locator" />
    <presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable7Member_FF3D9DF2F46C2F1D9E83408FC2F612EF" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable8Member" xlink:label="loc_csgp_OptionsExercisable8Member_D3BC2CF6284655690A01408FC2F60FF5" xlink:type="locator" />
    <presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable8Member_D3BC2CF6284655690A01408FC2F60FF5" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable9Member" xlink:label="loc_csgp_OptionsExercisable9Member_95C3AAA73B86B9BFEF96408FC2F614CE" xlink:type="locator" />
    <presentationArc order="19" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable9Member_95C3AAA73B86B9BFEF96408FC2F614CE" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisable10Member" xlink:label="loc_csgp_OptionsExercisable10Member_EFB5F3728B7C2D782DE2408FC2F64E72" xlink:type="locator" />
    <presentationArc order="20" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_013F30F819D8C6ECA864408FC2F639F0" xlink:to="loc_csgp_OptionsExercisable10Member_EFB5F3728B7C2D782DE2408FC2F64E72" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_39066A46919C4C985366408FC2F6B78C" xlink:type="locator" />
    <presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4A0A391C960B0EE16854408FC2E6A973" xlink:to="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_39066A46919C4C985366408FC2F6B78C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_A6AD6EF99B14E5B43720408FC2F6AFDC" xlink:type="locator" />
    <presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_39066A46919C4C985366408FC2F6B78C" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_A6AD6EF99B14E5B43720408FC2F6AFDC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherPensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_8C36C8D0FF94BB80D1BD408FC2F681D3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_A6AD6EF99B14E5B43720408FC2F6AFDC" xlink:to="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_8C36C8D0FF94BB80D1BD408FC2F681D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignPensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_ForeignPensionPlansDefinedBenefitMember_B9F0BBAB5839BC27750A408FC2F6D030" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_A6AD6EF99B14E5B43720408FC2F6AFDC" xlink:to="loc_us-gaap_ForeignPensionPlansDefinedBenefitMember_B9F0BBAB5839BC27750A408FC2F6D030" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:type="locator" />
    <presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4A0A391C960B0EE16854408FC2E6A973" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_82A7927A8E8212655E7C408FC2F617E8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_82A7927A8E8212655E7C408FC2F617E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_8DF1D88BA1CC778B4D56408FC2F68382" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_8DF1D88BA1CC778B4D56408FC2F68382" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherShareIncreaseDecrease" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherShareIncreaseDecrease_0961E50DE2FDE15BCD86408FC2F69F08" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherShareIncreaseDecrease_0961E50DE2FDE15BCD86408FC2F69F08" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_Increaseinsharesofcommonstockissuedpursuanttostockplan" xlink:label="loc_csgp_Increaseinsharesofcommonstockissuedpursuanttostockplan_9F6DB1468BB85C801173408FC2F6DE18" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_csgp_Increaseinsharesofcommonstockissuedpursuanttostockplan_9F6DB1468BB85C801173408FC2F6DE18" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_3D14A7E5D93476E6A8EF408FC2F6E5B7" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_3D14A7E5D93476E6A8EF408FC2F6E5B7" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_CumulativeEbitdaRequiredForAwardSharesToVest" xlink:label="loc_csgp_CumulativeEbitdaRequiredForAwardSharesToVest_1295590A5EC4D45DCCA5408FC2F6B185" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_csgp_CumulativeEbitdaRequiredForAwardSharesToVest_1295590A5EC4D45DCCA5408FC2F6B185" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_NumberOfConsecutiveQuartersToMantainCumulativeEbitdaRequiredForAwardSharesToVest" xlink:label="loc_csgp_NumberOfConsecutiveQuartersToMantainCumulativeEbitdaRequiredForAwardSharesToVest_AE25E740C930FA3856D7408FC2F640BA" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_csgp_NumberOfConsecutiveQuartersToMantainCumulativeEbitdaRequiredForAwardSharesToVest_AE25E740C930FA3856D7408FC2F640BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_342D91E99DC78B003F99408FC2F6071B" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_342D91E99DC78B003F99408FC2F6071B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:type="locator" />
    <presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_896EA46DDD594A54CCF9408FC2F6DD0C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_896EA46DDD594A54CCF9408FC2F6DD0C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_B576EA57F06586CE2947408FC2F6F89D" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_B576EA57F06586CE2947408FC2F6F89D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_FE1D688F3DDB494D280A408FC2F6D1EE" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_FE1D688F3DDB494D280A408FC2F6D1EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_128298EAB98320498E54408FC2F60C90" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_128298EAB98320498E54408FC2F60C90" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_D209081FCEE077E93F6A408FC2F6F6AE" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_D209081FCEE077E93F6A408FC2F6F6AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_EC2E4221ADA5876A3620408FC2F648D6" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_EC2E4221ADA5876A3620408FC2F648D6" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SharebasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange" xlink:label="loc_csgp_SharebasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange_67E4F21E8963E1571808408FC2F60C9B" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_csgp_SharebasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange_67E4F21E8963E1571808408FC2F60C9B" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SharebasedCompensationSharesGrantedUnderStockOptionPlansExercisePriceRange" xlink:label="loc_csgp_SharebasedCompensationSharesGrantedUnderStockOptionPlansExercisePriceRange_ED386173411702E7DDA8408FC2F674A9" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_csgp_SharebasedCompensationSharesGrantedUnderStockOptionPlansExercisePriceRange_ED386173411702E7DDA8408FC2F674A9" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SharebasedCompensationSharesExercisedUnderStockOptionPlansExercisePriceRange" xlink:label="loc_csgp_SharebasedCompensationSharesExercisedUnderStockOptionPlansExercisePriceRange_A1350F7ABD5AB6D370AF408FC2F6EDFB" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_csgp_SharebasedCompensationSharesExercisedUnderStockOptionPlansExercisePriceRange_A1350F7ABD5AB6D370AF408FC2F6EDFB" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SharebasedCompensationSharesCanceledorExpiredUnderStockOptionPlansExercisePriceRange" xlink:label="loc_csgp_SharebasedCompensationSharesCanceledorExpiredUnderStockOptionPlansExercisePriceRange_C9AB9107C001E3F6D637408FC2F653D1" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_csgp_SharebasedCompensationSharesCanceledorExpiredUnderStockOptionPlansExercisePriceRange_C9AB9107C001E3F6D637408FC2F653D1" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SharebasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange" xlink:label="loc_csgp_SharebasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange_200594DFE9D63783B60D408FC2F6B9D8" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_csgp_SharebasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange_200594DFE9D63783B60D408FC2F6B9D8" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_Exercisableatendofperiod" xlink:label="loc_csgp_Exercisableatendofperiod_8BDAEA7BC46F1F370337408FC2F64830" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_73CD37801CDA027778E9408FC2F632B1" xlink:to="loc_csgp_Exercisableatendofperiod_8BDAEA7BC46F1F370337408FC2F64830" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:type="locator" />
    <presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_95BADF35A4B6CF5D5E89408FC2F6C873" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_95BADF35A4B6CF5D5E89408FC2F6C873" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_D92C84FC9B54C5E45996408FC2F65AA9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_D92C84FC9B54C5E45996408FC2F65AA9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_1E96A6789609D70FF4A9408FC2F67ABF" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_1E96A6789609D70FF4A9408FC2F67ABF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_7EBEE36D9FC3F6458A41408FC2F602FB" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_7EBEE36D9FC3F6458A41408FC2F602FB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_5B5C42DC4AE88B5B357E408FC2F6A7E3" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_5B5C42DC4AE88B5B357E408FC2F6A7E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_E03760F0A807A3334F3A408FC2F64FE0" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_E03760F0A807A3334F3A408FC2F64FE0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_F545321760027E041ABA408FC2F6126D" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_F545321760027E041ABA408FC2F6126D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_B4FD1C510AC5C49F6BDF408FC2F688C7" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_B4FD1C510AC5C49F6BDF408FC2F688C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_77FD2304FFCC6A6C76D4408FC2F65D5A" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_77FD2304FFCC6A6C76D4408FC2F65D5A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2DDB16E29C7874B51E44408FC2F6F476" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_7E975D78C764C39FE9CD408FC2F6BF49" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2DDB16E29C7874B51E44408FC2F6F476" xlink:type="arc" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_FE1D688F3DDB494D280A408FC2F6D1EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_12238DE9FFB800C15194408FC2F6506A" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_12238DE9FFB800C15194408FC2F6506A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_6E4516703B3FD815ABB6408FC2F665D4" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_6E4516703B3FD815ABB6408FC2F665D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_562E36E605FA6AAB9C89408FC2F6AE0E" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_562E36E605FA6AAB9C89408FC2F6AE0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_F93E0CBFFCA30B6D1FD6408FC2F66434" xlink:type="locator" />
    <presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_F93E0CBFFCA30B6D1FD6408FC2F66434" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1D1A7635B7133986054C408FC2F64377" xlink:type="locator" />
    <presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1D1A7635B7133986054C408FC2F64377" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_891D4C3FAE58494B59A4408FC2F6B680" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1D1A7635B7133986054C408FC2F64377" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_891D4C3FAE58494B59A4408FC2F6B680" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_A02CD0CF8BEDAF58EAF4408FC2F649D5" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1D1A7635B7133986054C408FC2F64377" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_A02CD0CF8BEDAF58EAF4408FC2F649D5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_42A1ABB1EB7F5FDC0DE9408FC2F6767E" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1D1A7635B7133986054C408FC2F64377" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_42A1ABB1EB7F5FDC0DE9408FC2F6767E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_62FA196966F8670A83B1408FC2F69E98" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_1D1A7635B7133986054C408FC2F64377" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_62FA196966F8670A83B1408FC2F69E98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_CF822F4DAB2C0495937D408FC2F61AC3" xlink:type="locator" />
    <presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_CF822F4DAB2C0495937D408FC2F61AC3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_52D4E9EBD4887F7838A4408FC2F6BD3C" xlink:type="locator" />
    <presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_52D4E9EBD4887F7838A4408FC2F6BD3C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_5584BBAEB9C63C9F2023408FC2F69EC9" xlink:type="locator" />
    <presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_5584BBAEB9C63C9F2023408FC2F69EC9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_13A909B936DF6F614FDD408FC2F6C4C7" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_5584BBAEB9C63C9F2023408FC2F69EC9" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_13A909B936DF6F614FDD408FC2F6C4C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_C3CEAC3AA21D5D0B2563408FC2F641CF" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_5584BBAEB9C63C9F2023408FC2F69EC9" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_C3CEAC3AA21D5D0B2563408FC2F641CF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_78CD991B6D6604F0E433408FC2F6EDBC" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_5584BBAEB9C63C9F2023408FC2F69EC9" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_78CD991B6D6604F0E433408FC2F6EDBC" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_OptionsExercisableAbstract" xlink:label="loc_csgp_OptionsExercisableAbstract_57D48C160C802798D894408FC2F63F17" xlink:type="locator" />
    <presentationArc order="20" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_csgp_OptionsExercisableAbstract_57D48C160C802798D894408FC2F63F17" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_E0C0A0E665D112836F03408FC2F6FA16" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_OptionsExercisableAbstract_57D48C160C802798D894408FC2F63F17" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_E0C0A0E665D112836F03408FC2F6FA16" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_DCBBBC4255A773D9C06C408FC2F634E8" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_OptionsExercisableAbstract_57D48C160C802798D894408FC2F63F17" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_DCBBBC4255A773D9C06C408FC2F634E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_26C5139BBC292185E747408FC2F612DC" xlink:type="locator" />
    <presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_26C5139BBC292185E747408FC2F612DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_B4B2C92B6F6048C6DFB9408FC2F609EE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_26C5139BBC292185E747408FC2F612DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_B4B2C92B6F6048C6DFB9408FC2F609EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_8FA9F8AA357055A02A6F408FC2F63D23" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_26C5139BBC292185E747408FC2F612DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_8FA9F8AA357055A02A6F408FC2F63D23" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_3EC068F4E1D25A143A3F408FC2F61639" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_26C5139BBC292185E747408FC2F612DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_3EC068F4E1D25A143A3F408FC2F61639" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_4E0F831CC91128A37EA2408FC2F648F7" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_26C5139BBC292185E747408FC2F612DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_4E0F831CC91128A37EA2408FC2F648F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8F4234D72AFC516FBC70408FC2F67CED" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_26C5139BBC292185E747408FC2F612DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8F4234D72AFC516FBC70408FC2F67CED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_184CBBB990A90C99F1BF408FC2F620E3" xlink:type="locator" />
    <presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_184CBBB990A90C99F1BF408FC2F620E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_D3A4B4A61538CB7B3E97408FC2F63621" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_184CBBB990A90C99F1BF408FC2F620E3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_D3A4B4A61538CB7B3E97408FC2F63621" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_14318D9F190A7E6D8C51408FC2F68D22" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_184CBBB990A90C99F1BF408FC2F620E3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_14318D9F190A7E6D8C51408FC2F68D22" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_214210172815FF78DB28408FC2F602F9" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_184CBBB990A90C99F1BF408FC2F620E3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_214210172815FF78DB28408FC2F602F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_CED86C827AD324809BF6408FC2F65E8A" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_184CBBB990A90C99F1BF408FC2F620E3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_CED86C827AD324809BF6408FC2F65E8A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_87CAAF7CDDCDB3087536408FC2F608D5" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_184CBBB990A90C99F1BF408FC2F620E3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_87CAAF7CDDCDB3087536408FC2F608D5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract" xlink:label="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:type="locator" />
    <presentationArc order="23" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C4B8329D1F6C95B0A3C9408FC2F62E2E" xlink:to="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PercentageOfCompanyMatchOfEmployeeContribution" xlink:label="loc_csgp_PercentageOfCompanyMatchOfEmployeeContribution_BE0F20AB28BADB58567D408FC2F67EDE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:to="loc_csgp_PercentageOfCompanyMatchOfEmployeeContribution_BE0F20AB28BADB58567D408FC2F67EDE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_87002B586880669F967A408FC2F60FA9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_87002B586880669F967A408FC2F60FA9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_AACE8A5C07D022674FC8408FC2F6DCB8" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_AACE8A5C07D022674FC8408FC2F6DCB8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedContributionPlanAdministrativeExpenses" xlink:label="loc_us-gaap_DefinedContributionPlanAdministrativeExpenses_6FD26863EBD8DEA4142E408FC2F671E8" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:to="loc_us-gaap_DefinedContributionPlanAdministrativeExpenses_6FD26863EBD8DEA4142E408FC2F671E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_BA5D26CDF935723755EC408FC2F60C60" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_BA5D26CDF935723755EC408FC2F60C60" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PercentageOfPurchasePriceOfCompanysCommonStockToMarketPrice" xlink:label="loc_csgp_PercentageOfPurchasePriceOfCompanysCommonStockToMarketPrice_4C76410EBC49CE88B574408FC2F63612" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:to="loc_csgp_PercentageOfPurchasePriceOfCompanysCommonStockToMarketPrice_4C76410EBC49CE88B574408FC2F63612" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SharesAvailableEmployeeStockPurchasePlan" xlink:label="loc_csgp_SharesAvailableEmployeeStockPurchasePlan_497999B3DDC67C04001C4099297A4C28" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:to="loc_csgp_SharesAvailableEmployeeStockPurchasePlan_497999B3DDC67C04001C4099297A4C28" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_BF578856F641A276B162408FC2F60048" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract_7088EE75336D6C4DB444408FC2F6DFDF" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_BF578856F641A276B162408FC2F60048" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/EmployeeBenefitPlansTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CompensationRelatedCostsAbstract" xlink:label="loc_us-gaap_CompensationRelatedCostsAbstract_37642D834B90129C6D1EFF4B5726989A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_D595085DBEE0235E8268FF4B57263308" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationRelatedCostsAbstract_37642D834B90129C6D1EFF4B5726989A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_D595085DBEE0235E8268FF4B57263308" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_7B2C86F0149839614212FF4B57266099" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationRelatedCostsAbstract_37642D834B90129C6D1EFF4B5726989A" xlink:to="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_7B2C86F0149839614212FF4B57266099" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock_A0D778CDD42EF6FC4787FF4B57269FF8" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationRelatedCostsAbstract_37642D834B90129C6D1EFF4B5726989A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock_A0D778CDD42EF6FC4787FF4B57269FF8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_8973C824A32B64D8D7C9FF4B5726E08F" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationRelatedCostsAbstract_37642D834B90129C6D1EFF4B5726989A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_8973C824A32B64D8D7C9FF4B5726E08F" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/FairValue" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_E8D7898194E201A66970FF4B57745067" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_F9EB7BD79BBA5E7AF2E3FF4B57749115" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_E8D7898194E201A66970FF4B57745067" xlink:to="loc_us-gaap_FairValueDisclosuresTextBlock_F9EB7BD79BBA5E7AF2E3FF4B57749115" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/FairValueDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_8A73F5CB41E55AB75F002BA72CED1575" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9594CAC0C7A420172B3E2BA72CED6540" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_8A73F5CB41E55AB75F002BA72CED1575" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9594CAC0C7A420172B3E2BA72CED6540" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_931FB6292B68414E748D2BA72CED2ACA" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9594CAC0C7A420172B3E2BA72CED6540" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_931FB6292B68414E748D2BA72CED2ACA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6388BB226918C0660BE32BA72CED79E9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_931FB6292B68414E748D2BA72CED2ACA" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6388BB226918C0660BE32BA72CED79E9" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LandsofamericaMember" xlink:label="loc_csgp_LandsofamericaMember_E67CC66536A090B79D3A2BA72CED0B03" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6388BB226918C0660BE32BA72CED79E9" xlink:to="loc_csgp_LandsofamericaMember_E67CC66536A090B79D3A2BA72CED0B03" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ReactionWebMember" xlink:label="loc_csgp_ReactionWebMember_91EF0AA5582493F621432BA72CEDF3A2" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6388BB226918C0660BE32BA72CED79E9" xlink:to="loc_csgp_ReactionWebMember_91EF0AA5582493F621432BA72CEDF3A2" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_873027186C7606E102192BA72CED2BC5" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6388BB226918C0660BE32BA72CED79E9" xlink:to="loc_csgp_LoopnetMember_873027186C7606E102192BA72CED2BC5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_9780C045FCD1B721980B2BA72CEDC4C7" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9594CAC0C7A420172B3E2BA72CED6540" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_9780C045FCD1B721980B2BA72CEDC4C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_E3F7B34D8958C373A9DF2BA72CEDE1A9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_9780C045FCD1B721980B2BA72CEDC4C7" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_E3F7B34D8958C373A9DF2BA72CEDE1A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AuctionRateSecuritiesMember" xlink:label="loc_us-gaap_AuctionRateSecuritiesMember_BA513CBCC69219ACE02A2BA72CED8269" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_E3F7B34D8958C373A9DF2BA72CEDE1A9" xlink:to="loc_us-gaap_AuctionRateSecuritiesMember_BA513CBCC69219ACE02A2BA72CED8269" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_EF98E636E432BDAF5A422BA72CED4972" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9594CAC0C7A420172B3E2BA72CED6540" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_EF98E636E432BDAF5A422BA72CED4972" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9778B09944616AE960AE2BA72CED2253" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_EF98E636E432BDAF5A422BA72CED4972" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9778B09944616AE960AE2BA72CED2253" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_5F1D81F9C0F6624E29192BA72CEDD726" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_9778B09944616AE960AE2BA72CED2253" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_5F1D81F9C0F6624E29192BA72CEDD726" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B5317DE5438BB791BFF62BA72CEDB210" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9594CAC0C7A420172B3E2BA72CED6540" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B5317DE5438BB791BFF62BA72CEDB210" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_54AD7FC7CB8C734AE7B62BA72CEDB582" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B5317DE5438BB791BFF62BA72CEDB210" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_54AD7FC7CB8C734AE7B62BA72CEDB582" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_075D83BA8E367C9B98A12BA72CED5C64" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_54AD7FC7CB8C734AE7B62BA72CEDB582" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_075D83BA8E367C9B98A12BA72CED5C64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_083A5A76DF93086D6F6C2BA72CED309E" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_54AD7FC7CB8C734AE7B62BA72CEDB582" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_083A5A76DF93086D6F6C2BA72CED309E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_DC11E96A5151CA12834C2BA72CEDC742" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_54AD7FC7CB8C734AE7B62BA72CEDB582" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_DC11E96A5151CA12834C2BA72CEDC742" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_48277EDC073D4831C0482BA72CED8CB8" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9594CAC0C7A420172B3E2BA72CED6540" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_48277EDC073D4831C0482BA72CED8CB8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_D3A5CD8F6907568F1F3E2BA72CED0C78" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_48277EDC073D4831C0482BA72CED8CB8" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_D3A5CD8F6907568F1F3E2BA72CED0C78" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashMember" xlink:label="loc_us-gaap_CashMember_08756FE2C206C86BCD142BA72CED96E3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_D3A5CD8F6907568F1F3E2BA72CED0C78" xlink:to="loc_us-gaap_CashMember_08756FE2C206C86BCD142BA72CED96E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_4004AA583A0B57F786082BA72CEDF8A8" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_D3A5CD8F6907568F1F3E2BA72CED0C78" xlink:to="loc_us-gaap_MoneyMarketFundsMember_4004AA583A0B57F786082BA72CEDF8A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_2E6B450952990624C48D2BA72CEDAA76" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_D3A5CD8F6907568F1F3E2BA72CED0C78" xlink:to="loc_us-gaap_CommercialPaperMember_2E6B450952990624C48D2BA72CEDAA76" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_107A6BB4AB05F0A865062BA72CED8327" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_D3A5CD8F6907568F1F3E2BA72CED0C78" xlink:to="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_107A6BB4AB05F0A865062BA72CED8327" xlink:type="arc" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_D3A5CD8F6907568F1F3E2BA72CED0C78" xlink:to="loc_us-gaap_AuctionRateSecuritiesMember_BA513CBCC69219ACE02A2BA72CED8269" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_91FEEAA6A3B9BC842BCD2BA72CED8A2F" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9594CAC0C7A420172B3E2BA72CED6540" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_91FEEAA6A3B9BC842BCD2BA72CED8A2F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_7796EB06EDB10DF02B642BA72CED6515" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_91FEEAA6A3B9BC842BCD2BA72CED8A2F" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_7796EB06EDB10DF02B642BA72CED6515" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_01ECFC45E51AB74D874F2BA72CED3024" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_7796EB06EDB10DF02B642BA72CED6515" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_01ECFC45E51AB74D874F2BA72CED3024" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_C53A6C302C9DAA6F974E2BA72CEDB617" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_7796EB06EDB10DF02B642BA72CED6515" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_C53A6C302C9DAA6F974E2BA72CEDB617" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_5CDBB4935A27BE05AA2C2BA72CEDA265" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_C53A6C302C9DAA6F974E2BA72CEDB617" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_5CDBB4935A27BE05AA2C2BA72CEDA265" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_AuctionRateSecuritiesUponAcquisition" xlink:label="loc_csgp_AuctionRateSecuritiesUponAcquisition_3AE3670557AFF5371AA82BA72CED32E7" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_C53A6C302C9DAA6F974E2BA72CEDB617" xlink:to="loc_csgp_AuctionRateSecuritiesUponAcquisition_3AE3670557AFF5371AA82BA72CED32E7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_C6EB7C02078190A1174D2BA72CED15F5" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_C53A6C302C9DAA6F974E2BA72CEDB617" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_C6EB7C02078190A1174D2BA72CED15F5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_33D5E82EB095CEA1C5D72BA72CED81D2" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_C53A6C302C9DAA6F974E2BA72CEDB617" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_33D5E82EB095CEA1C5D72BA72CED81D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_5BFA1B870CDA87ED97912BA72CEDD326" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_C53A6C302C9DAA6F974E2BA72CEDB617" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_5BFA1B870CDA87ED97912BA72CEDD326" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_AuctionRateSecuritiesVariableRateDebtInstrumentsInterestRateResetPeriod" xlink:label="loc_csgp_AuctionRateSecuritiesVariableRateDebtInstrumentsInterestRateResetPeriod_CF09170FF32B3B275C542BA72CED185A" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_7796EB06EDB10DF02B642BA72CED6515" xlink:to="loc_csgp_AuctionRateSecuritiesVariableRateDebtInstrumentsInterestRateResetPeriod_CF09170FF32B3B275C542BA72CED185A" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_MinimumContractualMaturitiesOnUnderlyingSecuritiesInvolvedInAuctionRateSecurities" xlink:label="loc_csgp_MinimumContractualMaturitiesOnUnderlyingSecuritiesInvolvedInAuctionRateSecurities_68C2ADB85250246EEA372BA72CED8853" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_7796EB06EDB10DF02B642BA72CED6515" xlink:to="loc_csgp_MinimumContractualMaturitiesOnUnderlyingSecuritiesInvolvedInAuctionRateSecurities_68C2ADB85250246EEA372BA72CED8853" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableforsaleSecuritiesFailedAuctionValue" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesFailedAuctionValue_F8C284D1F3E4BDC583FD2BA72CEDC384" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_7796EB06EDB10DF02B642BA72CED6515" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesFailedAuctionValue_F8C284D1F3E4BDC583FD2BA72CEDC384" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_E8BD9E9EB5DF5325A7CB2BA72CED8A25" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_7796EB06EDB10DF02B642BA72CED6515" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_E8BD9E9EB5DF5325A7CB2BA72CED8A25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_9663CE22C750F8DB22A32BA72CED06B4" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_91FEEAA6A3B9BC842BCD2BA72CED8A2F" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_9663CE22C750F8DB22A32BA72CED06B4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_0F7260FEC87A96F1C23A2BA72CEDC5D1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_9663CE22C750F8DB22A32BA72CED06B4" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_0F7260FEC87A96F1C23A2BA72CEDC5D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_52F536BA5DA074DA433D2BA72CEDE930" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_9663CE22C750F8DB22A32BA72CED06B4" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_52F536BA5DA074DA433D2BA72CEDE930" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_653C315525F888EB6F612BA72CED93FD" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_52F536BA5DA074DA433D2BA72CEDE930" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_653C315525F888EB6F612BA72CED93FD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_61C65BA5C3941071C0A62BA72CEDBFC1" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_52F536BA5DA074DA433D2BA72CEDE930" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_61C65BA5C3941071C0A62BA72CEDBFC1" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_FairValueLiabilitiesDeferredConsiderationUponAcquisition" xlink:label="loc_csgp_FairValueLiabilitiesDeferredConsiderationUponAcquisition_52C9DC640D25E8C0B54A2BA72CED8F1B" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_52F536BA5DA074DA433D2BA72CEDE930" xlink:to="loc_csgp_FairValueLiabilitiesDeferredConsiderationUponAcquisition_52C9DC640D25E8C0B54A2BA72CED8F1B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_63DA7A08E0B6B726E6D92BA72CED1AFA" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_52F536BA5DA074DA433D2BA72CEDE930" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_63DA7A08E0B6B726E6D92BA72CED1AFA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_927DB5BD42209ED7F0CE2BA72CED147D" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_52F536BA5DA074DA433D2BA72CEDE930" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_927DB5BD42209ED7F0CE2BA72CED147D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_6FD5337E846994DEA6872BA72CED349B" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_91FEEAA6A3B9BC842BCD2BA72CED8A2F" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_6FD5337E846994DEA6872BA72CED349B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsDiscountRate" xlink:label="loc_us-gaap_FairValueInputsDiscountRate_0882BA1F505E6D878DEA2BA72CED0E65" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_91FEEAA6A3B9BC842BCD2BA72CED8A2F" xlink:to="loc_us-gaap_FairValueInputsDiscountRate_0882BA1F505E6D878DEA2BA72CED0E65" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BusinessAcquisitionContingentConsiderationCashPayment" xlink:label="loc_csgp_BusinessAcquisitionContingentConsiderationCashPayment_2EA52F409ED222D24FD52BA72CED34EE" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_91FEEAA6A3B9BC842BCD2BA72CED8A2F" xlink:to="loc_csgp_BusinessAcquisitionContingentConsiderationCashPayment_2EA52F409ED222D24FD52BA72CED34EE" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/FairValueTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_23990635920B345D6217FF4B568A246F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_FCBFC5A2CAE7E1810671FF4B568AC198" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_23990635920B345D6217FF4B568A246F" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_FCBFC5A2CAE7E1810671FF4B568AC198" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_0B5E64732B4F833F37CBFF4B568A6076" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_23990635920B345D6217FF4B568A246F" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_0B5E64732B4F833F37CBFF4B568A6076" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_770007A1864E0C958376FF4B568ABFA3" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_23990635920B345D6217FF4B568A246F" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_770007A1864E0C958376FF4B568ABFA3" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/Goodwill" xlink:type="extended">
    <loc xlink:href="csgp-20131231.xsd#csgp_GoodwillAbstract" xlink:label="loc_csgp_GoodwillAbstract_E57E958F65C59D088C98FF4B56A985AF" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillDisclosureTextBlock" xlink:label="loc_us-gaap_GoodwillDisclosureTextBlock_7F2F0D4C23A7DADBB3C4FF4B56A95BC8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_GoodwillAbstract_E57E958F65C59D088C98FF4B56A985AF" xlink:to="loc_us-gaap_GoodwillDisclosureTextBlock_7F2F0D4C23A7DADBB3C4FF4B56A95BC8" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/GoodwillDetails" xlink:type="extended">
    <loc xlink:href="csgp-20131231.xsd#csgp_GoodwillAbstract" xlink:label="loc_csgp_GoodwillAbstract_03FB884662CBE803D160FF4B56B9C2F9" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_FB596944D8F4401DF501FF4B56B9E171" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_GoodwillAbstract_03FB884662CBE803D160FF4B56B9C2F9" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_FB596944D8F4401DF501FF4B56B9E171" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1F7E521F19FEE7AC9330FF4B56B98B18" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_FB596944D8F4401DF501FF4B56B9E171" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1F7E521F19FEE7AC9330FF4B56B98B18" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_2DECE32F786AD0BA1AAEFF4B56B9F6D5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1F7E521F19FEE7AC9330FF4B56B98B18" xlink:to="loc_us-gaap_SegmentDomain_2DECE32F786AD0BA1AAEFF4B56B9F6D5" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_UnitedStatesMember" xlink:label="loc_csgp_UnitedStatesMember_FF721144A9D68E3DD12AFF4B56B9A0CF" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_2DECE32F786AD0BA1AAEFF4B56B9F6D5" xlink:to="loc_csgp_UnitedStatesMember_FF721144A9D68E3DD12AFF4B56B9A0CF" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_InternationalMember" xlink:label="loc_csgp_InternationalMember_EC4D595F5968404DB5FAFF4B56B9EA98" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_2DECE32F786AD0BA1AAEFF4B56B9F6D5" xlink:to="loc_csgp_InternationalMember_EC4D595F5968404DB5FAFF4B56B9EA98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_44CB4621F6832CBF654CFF4B56B90BEC" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_FB596944D8F4401DF501FF4B56B9E171" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_44CB4621F6832CBF654CFF4B56B90BEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B96C8B064FCFE590A93DFF4B56B9CF98" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_44CB4621F6832CBF654CFF4B56B90BEC" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B96C8B064FCFE590A93DFF4B56B9CF98" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_549E7C3B459AF1D66C00FF4B56B97B68" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_B96C8B064FCFE590A93DFF4B56B9CF98" xlink:to="loc_csgp_LoopnetMember_549E7C3B459AF1D66C00FF4B56B97B68" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_699EC315BE62C3B6AD78FF4B56B96F69" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_FB596944D8F4401DF501FF4B56B9E171" xlink:to="loc_us-gaap_GoodwillLineItems_699EC315BE62C3B6AD78FF4B56B96F69" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillPeriodIncreaseDecrease" xlink:label="loc_us-gaap_GoodwillPeriodIncreaseDecrease_8B7EC6C3F74A7FD842E3FF4B56B9EAB6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillLineItems_699EC315BE62C3B6AD78FF4B56B96F69" xlink:to="loc_us-gaap_GoodwillPeriodIncreaseDecrease_8B7EC6C3F74A7FD842E3FF4B56B9EAB6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_92A09CA1181BE8425F27FF4B56B979C0" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillLineItems_699EC315BE62C3B6AD78FF4B56B96F69" xlink:to="loc_us-gaap_GoodwillRollForward_92A09CA1181BE8425F27FF4B56B979C0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_85CF029998F5BAFD91BBFF4B56B9CF7B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_92A09CA1181BE8425F27FF4B56B979C0" xlink:to="loc_us-gaap_Goodwill_85CF029998F5BAFD91BBFF4B56B9CF7B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_1624691B2C81324C8442FF4B56B9E8A9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_92A09CA1181BE8425F27FF4B56B979C0" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_1624691B2C81324C8442FF4B56B9E8A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillTranslationAdjustments" xlink:label="loc_us-gaap_GoodwillTranslationAdjustments_C475CFCEE53A620111D7FF4B56B9F0E8" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_92A09CA1181BE8425F27FF4B56B979C0" xlink:to="loc_us-gaap_GoodwillTranslationAdjustments_C475CFCEE53A620111D7FF4B56B9F0E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_1E969D81A51BBC14A48FFF4B56B94550" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_92A09CA1181BE8425F27FF4B56B979C0" xlink:to="loc_us-gaap_Goodwill_1E969D81A51BBC14A48FFF4B56B94550" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/GoodwillTables" xlink:type="extended">
    <loc xlink:href="csgp-20131231.xsd#csgp_GoodwillAbstract" xlink:label="loc_csgp_GoodwillAbstract_F579D452E3708E4B7CA7FF4B568A979A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfGoodwillTextBlock" xlink:label="loc_us-gaap_ScheduleOfGoodwillTextBlock_EBA0494838869ABF1ED6FF4B568A20B8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_GoodwillAbstract_F579D452E3708E4B7CA7FF4B568A979A" xlink:to="loc_us-gaap_ScheduleOfGoodwillTextBlock_EBA0494838869ABF1ED6FF4B568A20B8" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/IncomeTaxes" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_EE6943854F18526C8E3BFF4B568A3680" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="loc_us-gaap_IncomeTaxDisclosureTextBlock_8251EEA46E67100E57F4FF4B568A2ED2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_EE6943854F18526C8E3BFF4B568A3680" xlink:to="loc_us-gaap_IncomeTaxDisclosureTextBlock_8251EEA46E67100E57F4FF4B568A2ED2" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/IncomeTaxesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_2D9F828739553E09C2DB40D80BC6F60C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_2D9F828739553E09C2DB40D80BC6F60C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_D0B9C06C7215E1AB58F840D80BC6B859" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_2D9F828739553E09C2DB40D80BC6F60C" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_D0B9C06C7215E1AB58F840D80BC6B859" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_A389E9E480FC8069340B40D80BC6135A" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_2D9F828739553E09C2DB40D80BC6F60C" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_A389E9E480FC8069340B40D80BC6135A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_5D2B217BFB1479002B1B40D80BC68E37" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_2D9F828739553E09C2DB40D80BC6F60C" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_5D2B217BFB1479002B1B40D80BC68E37" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_822FD8CD21551C222CA740D80BC6102B" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_2D9F828739553E09C2DB40D80BC6F60C" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_822FD8CD21551C222CA740D80BC6102B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_128ACBF0DAC6DC25F83540D80BC690BF" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_128ACBF0DAC6DC25F83540D80BC690BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_63539004A509556E922440D80BC6333B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_128ACBF0DAC6DC25F83540D80BC690BF" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_63539004A509556E922440D80BC6333B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_A5BF7F10236F6FF7FBD640D80BC6F450" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_128ACBF0DAC6DC25F83540D80BC690BF" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_A5BF7F10236F6FF7FBD640D80BC6F450" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_F622FAEBA24F8439C71D40D80BC68840" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_128ACBF0DAC6DC25F83540D80BC690BF" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_F622FAEBA24F8439C71D40D80BC68840" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_TotalDeferredIncomeTaxPerYear" xlink:label="loc_csgp_TotalDeferredIncomeTaxPerYear_EE8A32E9A468289F215340D80BC60208" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_128ACBF0DAC6DC25F83540D80BC690BF" xlink:to="loc_csgp_TotalDeferredIncomeTaxPerYear_EE8A32E9A468289F215340D80BC60208" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_94C937ABE81B6AD7AA0B40D80BC613BF" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_94C937ABE81B6AD7AA0B40D80BC613BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsGrossAbstract" xlink:label="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_E0166D0550CA7D26E7F640D80BC6DEEC" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_E0166D0550CA7D26E7F640D80BC6DEEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_46FDB94BF37F4210F4FB40D80BC6AB3F" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_46FDB94BF37F4210F4FB40D80BC6AB3F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_2A0635463A24D87788E140D80BC61025" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_2A0635463A24D87788E140D80BC61025" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_D1AD6E429E8CCFF23F9640D80BC6062A" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_D1AD6E429E8CCFF23F9640D80BC6062A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves_245EF461F8402EB6497540D80BC68837" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves_245EF461F8402EB6497540D80BC68837" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross" xlink:label="loc_us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross_1E056AD2CF7051C7705B40D80BC6E4FE" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross_1E056AD2CF7051C7705B40D80BC6E4FE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent_598380AF37983FCCDD0F40D80BC6F92B" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent_598380AF37983FCCDD0F40D80BC6F92B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredIncome" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredIncome_4C1FF16E062F539D92DE40D80BC6B74B" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredIncome_4C1FF16E062F539D92DE40D80BC6B74B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction_4E90081D3472B664C9D340D80BC6D5F4" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction_4E90081D3472B664C9D340D80BC6D5F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsGross" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_12F7F1C40055AA1FD6A040D80BC6E367" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxAssetsGrossAbstract_49516536A0883012C74B40D80BC62769" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_12F7F1C40055AA1FD6A040D80BC6E367" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesAbstract" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesAbstract_B4F6061324237676A95640D80BC6DFFC" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesAbstract_B4F6061324237676A95640D80BC6DFFC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPrepaidExpenses" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_A771528BC2DD6F647A5940D80BC644AD" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesAbstract_B4F6061324237676A95640D80BC6DFFC" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_A771528BC2DD6F647A5940D80BC644AD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_BAF59B2FE7151109A38440D80BC67C93" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesAbstract_B4F6061324237676A95640D80BC6DFFC" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_BAF59B2FE7151109A38440D80BC67C93" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_E2871D10E57D1CF8BBCF40D80BC641C8" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesAbstract_B4F6061324237676A95640D80BC6DFFC" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_E2871D10E57D1CF8BBCF40D80BC641C8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaap_DeferredTaxLiabilities_30557FACF098370D3A1140D80BC6C900" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredTaxLiabilitiesAbstract_B4F6061324237676A95640D80BC6DFFC" xlink:to="loc_us-gaap_DeferredTaxLiabilities_30557FACF098370D3A1140D80BC6C900" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_879305F8D1000E45D20140D80BC634B7" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_879305F8D1000E45D20140D80BC634B7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_D86748DCD3177B9AE72140D80BC69E60" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_D86748DCD3177B9AE72140D80BC69E60" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_9D7F48070802818C27C640D80BC60320" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_9D7F48070802818C27C640D80BC60320" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_04D6757F7DD135EEF87640D80BC67500" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_04D6757F7DD135EEF87640D80BC67500" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_32A1AD9724EF82D86EA540D80BC690D2" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_32A1AD9724EF82D86EA540D80BC690D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_79B15A1BBC91ED3EA37640D80BC621C7" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_79B15A1BBC91ED3EA37640D80BC621C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_3F960FE6EA6B120006FA40D80BC6B5BD" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_3F960FE6EA6B120006FA40D80BC6B5BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential" xlink:label="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_72A51BAED63B5AD6780840D80BC62401" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_72A51BAED63B5AD6780840D80BC62401" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_1487AC7C8D790CDC644B40D80BC616A7" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_1487AC7C8D790CDC644B40D80BC616A7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_D6E1021C5020A80F48B440D80BC65474" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_D6E1021C5020A80F48B440D80BC65474" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpense" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpense_CE6353B9D9EBF325B01040D80BC6EC48" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpense_CE6353B9D9EBF325B01040D80BC6EC48" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_E3885BFF063AB92A5B2140D80BC69156" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_E3885BFF063AB92A5B2140D80BC69156" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_329328155307DB657AE540D80BC6657C" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_329328155307DB657AE540D80BC6657C" xlink:type="arc" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_FA7A9E71C9D6FC5BEFC740D80BC6060E" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_94C937ABE81B6AD7AA0B40D80BC613BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxesPaid" xlink:label="loc_us-gaap_IncomeTaxesPaid_3BF85B496BF2DA140DF440D80BC6A43B" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_IncomeTaxesPaid_3BF85B496BF2DA140DF440D80BC6A43B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_AEFE53F714EC888A0E6440D80BC62FC4" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_AEFE53F714EC888A0E6440D80BC62FC4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_E99CA6FDB1E1E8A6FB2F40D80BC67295" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_AEFE53F714EC888A0E6440D80BC62FC4" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_E99CA6FDB1E1E8A6FB2F40D80BC67295" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_4CF522B75F545500906840D80BC65BEB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_E99CA6FDB1E1E8A6FB2F40D80BC67295" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_4CF522B75F545500906840D80BC65BEB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCountryMember" xlink:label="loc_us-gaap_ForeignCountryMember_0EEFB6818484A628935A40D80BC69AA3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_4CF522B75F545500906840D80BC65BEB" xlink:to="loc_us-gaap_ForeignCountryMember_0EEFB6818484A628935A40D80BC69AA3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="loc_us-gaap_DomesticCountryMember_58C56D097518BBF592EF40D80BC6748A" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_4CF522B75F545500906840D80BC65BEB" xlink:to="loc_us-gaap_DomesticCountryMember_58C56D097518BBF592EF40D80BC6748A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_A151DEC38623B38E34D640D80BC60B4C" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_4CF522B75F545500906840D80BC65BEB" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_A151DEC38623B38E34D640D80BC60B4C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_64170BA6DA1596F23AE640D80BC66F13" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_AEFE53F714EC888A0E6440D80BC62FC4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_64170BA6DA1596F23AE640D80BC66F13" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3356631DD1384139FB0740D80BC670A6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_64170BA6DA1596F23AE640D80BC66F13" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3356631DD1384139FB0740D80BC670A6" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_975F84E716BB800470EC40D80BC638E1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3356631DD1384139FB0740D80BC670A6" xlink:to="loc_csgp_LoopnetMember_975F84E716BB800470EC40D80BC638E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_57E8652F2006ED508D8E40D80BC6DAE0" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_AEFE53F714EC888A0E6440D80BC62FC4" xlink:to="loc_us-gaap_OperatingLossCarryforwardsLineItems_57E8652F2006ED508D8E40D80BC6DAE0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_24291D66CFA7F9DD644A40D80BC6FF13" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_57E8652F2006ED508D8E40D80BC6DAE0" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_24291D66CFA7F9DD644A40D80BC6FF13" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaap_OperatingLossCarryforwards_4E7FA76EDF32E21DB05B40D80BC657E3" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_57E8652F2006ED508D8E40D80BC6DAE0" xlink:to="loc_us-gaap_OperatingLossCarryforwards_4E7FA76EDF32E21DB05B40D80BC657E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLossCarryforwardsExpirationDate" xlink:label="loc_us-gaap_OperatingLossCarryforwardsExpirationDate_AF64EB2815C769F03D6440D80BC696DE" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_57E8652F2006ED508D8E40D80BC6DAE0" xlink:to="loc_us-gaap_OperatingLossCarryforwardsExpirationDate_AF64EB2815C769F03D6440D80BC696DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_CF85ED856D54D780810340D80BC6F2DF" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_57E8652F2006ED508D8E40D80BC6DAE0" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_CF85ED856D54D780810340D80BC6F2DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward_69DCBB290FCCC8EA539440D80BC691B9" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_57E8652F2006ED508D8E40D80BC6DAE0" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward_69DCBB290FCCC8EA539440D80BC691B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward" xlink:label="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_06063CFBAC02FCE23BDB40D80BC6B1C3" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_06063CFBAC02FCE23BDB40D80BC6B1C3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_E7BBBC28E1701B85A80840D80BC6F5BF" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_06063CFBAC02FCE23BDB40D80BC6B1C3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_E7BBBC28E1701B85A80840D80BC6F5BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_FE21C1576854C021C78B40D80BC621CB" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_06063CFBAC02FCE23BDB40D80BC6B1C3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_FE21C1576854C021C78B40D80BC621CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_5DA560E42A4A0A61265E40D80BC6EDCA" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_06063CFBAC02FCE23BDB40D80BC6B1C3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_5DA560E42A4A0A61265E40D80BC6EDCA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_BF2442B1AB7CC88F0E2440D80BC688EC" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_06063CFBAC02FCE23BDB40D80BC6B1C3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_BF2442B1AB7CC88F0E2440D80BC688EC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_E0EA64D22EF732DB7FF340D80BC64212" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_06063CFBAC02FCE23BDB40D80BC6B1C3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_E0EA64D22EF732DB7FF340D80BC64212" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_F6C639F2A337538213B740D80BC6C157" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_06063CFBAC02FCE23BDB40D80BC6B1C3" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_F6C639F2A337538213B740D80BC6C157" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_C2043C51DEC6283A120A40D80BC65354" xlink:type="locator" />
    <presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_C2043C51DEC6283A120A40D80BC65354" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_26FE13C1BEFF3F77EDF640D80BC685F7" xlink:type="locator" />
    <presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_26FE13C1BEFF3F77EDF640D80BC685F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_7E01688A93E208AA526A40D80BC63F45" xlink:type="locator" />
    <presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_972450B04FA38FE1AD9A40D80BC6E9BA" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_7E01688A93E208AA526A40D80BC63F45" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/IncomeTaxesTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_A27479A495A5ECA2F5DCFF4B576583FE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5C5F3DF9249E175B8E9AFF4B57658DCA" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_A27479A495A5ECA2F5DCFF4B576583FE" xlink:to="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5C5F3DF9249E175B8E9AFF4B57658DCA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_18B25B0CE8CE3D0B02D0FF4B5765B287" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_A27479A495A5ECA2F5DCFF4B576583FE" xlink:to="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_18B25B0CE8CE3D0B02D0FF4B5765B287" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_20C08A362C4B4E5E377EFF4B5765E7E4" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_A27479A495A5ECA2F5DCFF4B576583FE" xlink:to="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_20C08A362C4B4E5E377EFF4B5765E7E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock_6A9C4A833576C1AC4247FF4B57657448" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_A27479A495A5ECA2F5DCFF4B576583FE" xlink:to="loc_us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock_6A9C4A833576C1AC4247FF4B57657448" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/IntangiblesAndOtherAssets" xlink:type="extended">
    <loc xlink:href="csgp-20131231.xsd#csgp_IntangiblesAndOtherAssetsAbstract" xlink:label="loc_csgp_IntangiblesAndOtherAssetsAbstract_7050248D78821439CB3EFF4B56E88CC1" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IntangibleAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_IntangibleAssetsDisclosureTextBlock_132AF7619E19C8B4B185FF4B56E8FBCF" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_IntangiblesAndOtherAssetsAbstract_7050248D78821439CB3EFF4B56E88CC1" xlink:to="loc_us-gaap_IntangibleAssetsDisclosureTextBlock_132AF7619E19C8B4B185FF4B56E8FBCF" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/IntangiblesAndOtherAssetsDetails" xlink:type="extended">
    <loc xlink:href="csgp-20131231.xsd#csgp_IntangiblesAndOtherAssetsAbstract" xlink:label="loc_csgp_IntangiblesAndOtherAssetsAbstract_5796788A79658D3ED0D32BA72CDDC417" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_854C517158FC7CCE10772BA72CDDE8C0" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_IntangiblesAndOtherAssetsAbstract_5796788A79658D3ED0D32BA72CDDC417" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_854C517158FC7CCE10772BA72CDDE8C0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_897240597B09235180DA2BA72CDD79BB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_854C517158FC7CCE10772BA72CDDE8C0" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_897240597B09235180DA2BA72CDD79BB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6066D22828AD6F3CEA6E2BA72CDD6262" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_897240597B09235180DA2BA72CDD79BB" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6066D22828AD6F3CEA6E2BA72CDD6262" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_4D1ECD2D207A6B4417292BA72CDD2C5E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6066D22828AD6F3CEA6E2BA72CDD6262" xlink:to="loc_csgp_LoopnetMember_4D1ECD2D207A6B4417292BA72CDD2C5E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_EBB441C677B82684A8782BA72CDDBF70" xlink:type="locator" />
    <presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_854C517158FC7CCE10772BA72CDDE8C0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_EBB441C677B82684A8782BA72CDDBF70" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EE75CB4C9DEDB3F579A92BA72CDDCCFB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_EBB441C677B82684A8782BA72CDDBF70" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EE75CB4C9DEDB3F579A92BA72CDDCCFB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_BCF443C3389F34B90C432BDF17E47C71" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EE75CB4C9DEDB3F579A92BA72CDDCCFB" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_BCF443C3389F34B90C432BDF17E47C71" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BuildingPhotographyMember" xlink:label="loc_csgp_BuildingPhotographyMember_532B0E9492B02251A6242BA72CDD3871" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EE75CB4C9DEDB3F579A92BA72CDDCCFB" xlink:to="loc_csgp_BuildingPhotographyMember_532B0E9492B02251A6242BA72CDD3871" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DatabasesMember" xlink:label="loc_us-gaap_DatabasesMember_7AEAF1EFF72F7286902B2BA72CDD8453" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EE75CB4C9DEDB3F579A92BA72CDDCCFB" xlink:to="loc_us-gaap_DatabasesMember_7AEAF1EFF72F7286902B2BA72CDD8453" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CustomerContractsMember" xlink:label="loc_us-gaap_CustomerContractsMember_E6E0F6FA128B3AA3DBAB2BA72CDD1C63" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EE75CB4C9DEDB3F579A92BA72CDDCCFB" xlink:to="loc_us-gaap_CustomerContractsMember_E6E0F6FA128B3AA3DBAB2BA72CDD1C63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="loc_us-gaap_TradeNamesMember_E7DE08F0318DE89551392BA72CDD4479" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EE75CB4C9DEDB3F579A92BA72CDDCCFB" xlink:to="loc_us-gaap_TradeNamesMember_E7DE08F0318DE89551392BA72CDD4479" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_8AF5592879D4A765A1482BA72CDD26B6" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_854C517158FC7CCE10772BA72CDDE8C0" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_8AF5592879D4A765A1482BA72CDD26B6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_8ECF0C3A061CD54D39A02BA72CDD5779" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_8AF5592879D4A765A1482BA72CDD26B6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_8ECF0C3A061CD54D39A02BA72CDD5779" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_288E2DF0B249BBD8DD8E2BA72CDD4FDC" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_8AF5592879D4A765A1482BA72CDD26B6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_288E2DF0B249BBD8DD8E2BA72CDD4FDC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_6C533C9EF5AD40B4E4872BA72CDD7443" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_8AF5592879D4A765A1482BA72CDD26B6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_6C533C9EF5AD40B4E4872BA72CDD7443" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_001923A84C3DF71D1D7D2BA72CDD6BDB" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_8AF5592879D4A765A1482BA72CDD26B6" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_001923A84C3DF71D1D7D2BA72CDD6BDB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets_ACF16205DCC7715154612BA72CDD5452" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_8AF5592879D4A765A1482BA72CDD26B6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets_ACF16205DCC7715154612BA72CDD5452" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentForAmortization" xlink:label="loc_us-gaap_AdjustmentForAmortization_BA27FB8CD57B16C8846E2BA72CDD0402" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_8AF5592879D4A765A1482BA72CDD26B6" xlink:to="loc_us-gaap_AdjustmentForAmortization_BA27FB8CD57B16C8846E2BA72CDD0402" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_AE1F36B08A8FB6EDA1F52BA72CDDEDA7" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_IntangiblesAndOtherAssetsAbstract_5796788A79658D3ED0D32BA72CDDC417" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_AE1F36B08A8FB6EDA1F52BA72CDDEDA7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_7D3D3BFC148F4ED7DAED2BA72CDD4230" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_AE1F36B08A8FB6EDA1F52BA72CDDEDA7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_7D3D3BFC148F4ED7DAED2BA72CDD4230" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_5FF91DA2BDDFF00372622BA72CDDF45C" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_AE1F36B08A8FB6EDA1F52BA72CDDEDA7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_5FF91DA2BDDFF00372622BA72CDDF45C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_BDF15185214C7E877DDB2BA72CDD6CB0" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_AE1F36B08A8FB6EDA1F52BA72CDDEDA7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_BDF15185214C7E877DDB2BA72CDD6CB0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_9BBAB84CD6D6754010A32BA72CDD5D99" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_AE1F36B08A8FB6EDA1F52BA72CDDEDA7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_9BBAB84CD6D6754010A32BA72CDD5D99" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4940ED1DB718C6842E7D2BA72CDDF557" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_AE1F36B08A8FB6EDA1F52BA72CDDEDA7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4940ED1DB718C6842E7D2BA72CDDF557" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/IntangiblesAndOtherAssetsTables" xlink:type="extended">
    <loc xlink:href="csgp-20131231.xsd#csgp_IntangiblesAndOtherAssetsAbstract" xlink:label="loc_csgp_IntangiblesAndOtherAssetsAbstract_159140E6DC6194576D93FF4B56E83432" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_575EAEA3E294AFA3935AFF4B56E8B117" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_IntangiblesAndOtherAssetsAbstract_159140E6DC6194576D93FF4B56E83432" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_575EAEA3E294AFA3935AFF4B56E8B117" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/Investments" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:label="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_D653A8CB775CAD452EB1FF4B56B99847" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_E8C2B1043BBD87DA79E8FF4B56B9CC7E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_D653A8CB775CAD452EB1FF4B56B99847" xlink:to="loc_us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_E8C2B1043BBD87DA79E8FF4B56B9CC7E" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/InvestmentsAvailableForSaleSecuritiesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:label="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_9F6DAC0315AD5BC9FFD32BA72CFD7F8B" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_17EEE86FFEED6753F3092BA72CFD68AF" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_9F6DAC0315AD5BC9FFD32BA72CFD7F8B" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_17EEE86FFEED6753F3092BA72CFD68AF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_763A9D49299B978D730B2BA72CFDBEC5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_17EEE86FFEED6753F3092BA72CFD68AF" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_763A9D49299B978D730B2BA72CFDBEC5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_2EB672DD426DE89691DE2BA72CFDA7EC" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_763A9D49299B978D730B2BA72CFDBEC5" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_2EB672DD426DE89691DE2BA72CFDA7EC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_D88130B7B0D3E7814FFC2BA72CFDC784" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_2EB672DD426DE89691DE2BA72CFDA7EC" xlink:to="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_D88130B7B0D3E7814FFC2BA72CFDC784" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AuctionRateSecuritiesMember" xlink:label="loc_us-gaap_AuctionRateSecuritiesMember_2641F72B968E69BB5C6D2BA72CFD7809" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_2EB672DD426DE89691DE2BA72CFDA7EC" xlink:to="loc_us-gaap_AuctionRateSecuritiesMember_2641F72B968E69BB5C6D2BA72CFD7809" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_0A858A3F812F751973072BA72CFD4211" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_17EEE86FFEED6753F3092BA72CFD68AF" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_0A858A3F812F751973072BA72CFD4211" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses_15582255424346D7985F2BA72CFD389F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_0A858A3F812F751973072BA72CFD4211" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses_15582255424346D7985F2BA72CFD389F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedGains" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedGains_8FDA9FFD733E7C00A1A82BA72CFD536A" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_0A858A3F812F751973072BA72CFD4211" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedGains_8FDA9FFD733E7C00A1A82BA72CFD536A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses_0C3F72749C6740E2B2932BA72CFD03EA" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_0A858A3F812F751973072BA72CFD4211" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses_0C3F72749C6740E2B2932BA72CFD03EA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAbstract" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAbstract_D461345F658AD2C1B8662BA72CFD419B" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_0A858A3F812F751973072BA72CFD4211" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAbstract_D461345F658AD2C1B8662BA72CFD419B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_001665FBE1606EF4BCF02BA72CFDE5F1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_D461345F658AD2C1B8662BA72CFD419B" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_001665FBE1606EF4BCF02BA72CFDE5F1" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_GrossUnrealizedGainsforAvailableForSaleSecurities" xlink:label="loc_csgp_GrossUnrealizedGainsforAvailableForSaleSecurities_38D1AE1450BB13EEE8A12BA72CFD1363" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_D461345F658AD2C1B8662BA72CFD419B" xlink:to="loc_csgp_GrossUnrealizedGainsforAvailableForSaleSecurities_38D1AE1450BB13EEE8A12BA72CFD1363" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_GrossUnrealizedLossesforAvailableForSaleSecurities" xlink:label="loc_csgp_GrossUnrealizedLossesforAvailableForSaleSecurities_E3A9648F661A1AE94FC02BA72CFD61FC" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_D461345F658AD2C1B8662BA72CFD419B" xlink:to="loc_csgp_GrossUnrealizedLossesforAvailableForSaleSecurities_E3A9648F661A1AE94FC02BA72CFD61FC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_A2926E6BEDA85C8376AA2BA72CFDF6EC" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_D461345F658AD2C1B8662BA72CFD419B" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_A2926E6BEDA85C8376AA2BA72CFDF6EC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_8BC535D9C0E05A1B90A42BA72CFDC388" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_0A858A3F812F751973072BA72CFD4211" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_8BC535D9C0E05A1B90A42BA72CFDC388" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_AE13F56487CB408264A32BA72CFDC2B1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_8BC535D9C0E05A1B90A42BA72CFDC388" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_AE13F56487CB408264A32BA72CFDC2B1" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/InvestmentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:label="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_03AD7143ED3E591EEE5C2BA72CFD0021" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_B89B95DEA78B9D766DAD2BA72CFDDDF3" xlink:type="locator" />
    <presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_03AD7143ED3E591EEE5C2BA72CFD0021" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_B89B95DEA78B9D766DAD2BA72CFDDDF3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_2CD36E8803B6454E9D1B2BA72CFD62A5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_B89B95DEA78B9D766DAD2BA72CFDDDF3" xlink:to="loc_us-gaap_RangeAxis_2CD36E8803B6454E9D1B2BA72CFD62A5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_D07BF81C793727AA619C2BA72CFD7A69" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeAxis_2CD36E8803B6454E9D1B2BA72CFD62A5" xlink:to="loc_us-gaap_RangeMember_D07BF81C793727AA619C2BA72CFD7A69" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_BA40877E20A4AC3BC8D32BA72CFD64B3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_D07BF81C793727AA619C2BA72CFD7A69" xlink:to="loc_us-gaap_MinimumMember_BA40877E20A4AC3BC8D32BA72CFD64B3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_5726DB8DFC82BABD6FA12BA72CFD76CD" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_B89B95DEA78B9D766DAD2BA72CFDDDF3" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_5726DB8DFC82BABD6FA12BA72CFD76CD" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ShortTermInvestmentsMaturityTerm" xlink:label="loc_csgp_ShortTermInvestmentsMaturityTerm_D3B4D8CB9CD2DD7E5D822BA72CFDC653" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_5726DB8DFC82BABD6FA12BA72CFD76CD" xlink:to="loc_csgp_ShortTermInvestmentsMaturityTerm_D3B4D8CB9CD2DD7E5D822BA72CFDC653" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_AvailableForSaleShortTermInvestmentContractualMaturities" xlink:label="loc_csgp_AvailableForSaleShortTermInvestmentContractualMaturities_166E993A421979B6620E2BA72CFD6D20" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_5726DB8DFC82BABD6FA12BA72CFD76CD" xlink:to="loc_csgp_AvailableForSaleShortTermInvestmentContractualMaturities_166E993A421979B6620E2BA72CFD6D20" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_FB45C8A0CCBD3FEC27E82BA72CFD415C" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_5726DB8DFC82BABD6FA12BA72CFD76CD" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_FB45C8A0CCBD3FEC27E82BA72CFD415C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_C7B7B0F5C692D1A810CA2BA72CFDC52C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_FB45C8A0CCBD3FEC27E82BA72CFD415C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_C7B7B0F5C692D1A810CA2BA72CFDC52C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_F517786512855EB0B7F02BA72CFD7D00" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_FB45C8A0CCBD3FEC27E82BA72CFD415C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_F517786512855EB0B7F02BA72CFD7D00" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_F9C7C387F9F74AFF7D172BA72CFDF3A5" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_FB45C8A0CCBD3FEC27E82BA72CFD415C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_F9C7C387F9F74AFF7D172BA72CFDF3A5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_A67F2583D2C773A7F33C2BA72CFDCB7D" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_FB45C8A0CCBD3FEC27E82BA72CFD415C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_A67F2583D2C773A7F33C2BA72CFDCB7D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_9F596C64238D0FF650E72BA72CFD90FC" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_FB45C8A0CCBD3FEC27E82BA72CFD415C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_9F596C64238D0FF650E72BA72CFD90FC" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/InvestmentsTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:label="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_1A44796DE5B86F58CE52FF4B57656600" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock" xlink:label="loc_us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock_78DF810093453D11757AFF4B57657D61" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_1A44796DE5B86F58CE52FF4B57656600" xlink:to="loc_us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock_78DF810093453D11757AFF4B57657D61" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_E7B760C734C1C6AF1C1CFF4B57659024" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_1A44796DE5B86F58CE52FF4B57656600" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_E7B760C734C1C6AF1C1CFF4B57659024" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock_A80BACE4840577212921FF4B5765A485" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_1A44796DE5B86F58CE52FF4B57656600" xlink:to="loc_us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock_A80BACE4840577212921FF4B5765A485" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/LongTermDebt" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtCurrentAndNoncurrentAbstract" xlink:label="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_C7EA6D166719C61120F6FF4B56D86261" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtTextBlock" xlink:label="loc_us-gaap_LongTermDebtTextBlock_41DB03E214C077038CB6FF4B56D8B0B1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_C7EA6D166719C61120F6FF4B56D86261" xlink:to="loc_us-gaap_LongTermDebtTextBlock_41DB03E214C077038CB6FF4B56D8B0B1" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/LongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtCurrentAndNoncurrentAbstract" xlink:label="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_15FF016DFB2D47982EBE0625FEC78FBE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_AF8422C3F0F59E45B6E00625FEC70FC8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_15FF016DFB2D47982EBE0625FEC78FBE" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_AF8422C3F0F59E45B6E00625FEC70FC8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_7FADDC1B1B4FB6BCD1460625FEC749E4" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_AF8422C3F0F59E45B6E00625FEC70FC8" xlink:to="loc_us-gaap_VariableRateAxis_7FADDC1B1B4FB6BCD1460625FEC749E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_A0FC996AD08064F707660625FEC7A409" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateAxis_7FADDC1B1B4FB6BCD1460625FEC749E4" xlink:to="loc_us-gaap_VariableRateDomain_A0FC996AD08064F707660625FEC7A409" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_FederalFundsRateMember" xlink:label="loc_csgp_FederalFundsRateMember_5F431ADB92B6BCC41FE30625FEC76478" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateDomain_A0FC996AD08064F707660625FEC7A409" xlink:to="loc_csgp_FederalFundsRateMember_5F431ADB92B6BCC41FE30625FEC76478" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_0934171596ABF871CEA10625FEC73F85" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateDomain_A0FC996AD08064F707660625FEC7A409" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_0934171596ABF871CEA10625FEC73F85" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_F4DC584C0D7DECB9AFD50625FEC787A3" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_AF8422C3F0F59E45B6E00625FEC70FC8" xlink:to="loc_us-gaap_RangeAxis_F4DC584C0D7DECB9AFD50625FEC787A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_4116B5C7C84C040437360625FEC762E1" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeAxis_F4DC584C0D7DECB9AFD50625FEC787A3" xlink:to="loc_us-gaap_RangeMember_4116B5C7C84C040437360625FEC762E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_D13C3FE0DFFC8BB047950625FEC7DC8F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_4116B5C7C84C040437360625FEC762E1" xlink:to="loc_us-gaap_MinimumMember_D13C3FE0DFFC8BB047950625FEC7DC8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_C4C4B44B2DE08BE55B770625FEC71EB9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_4116B5C7C84C040437360625FEC762E1" xlink:to="loc_us-gaap_MaximumMember_C4C4B44B2DE08BE55B770625FEC71EB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_BAAC30FF6511E326D2110625FEC77DCA" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_AF8422C3F0F59E45B6E00625FEC70FC8" xlink:to="loc_dei_LegalEntityAxis_BAAC30FF6511E326D2110625FEC77DCA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_6EB3A2CFB232DBAE6A910625FEC7C80E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_BAAC30FF6511E326D2110625FEC77DCA" xlink:to="loc_dei_EntityDomain_6EB3A2CFB232DBAE6A910625FEC7C80E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="loc_us-gaap_ParentCompanyMember_924249B768D717CFAD690625FEC7526F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_6EB3A2CFB232DBAE6A910625FEC7C80E" xlink:to="loc_us-gaap_ParentCompanyMember_924249B768D717CFAD690625FEC7526F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_CA018CBACF8FF942272C0625FEC78BAC" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_AF8422C3F0F59E45B6E00625FEC70FC8" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_CA018CBACF8FF942272C0625FEC78BAC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_D586A38C09F91EC6C5430625FEC7C356" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_CA018CBACF8FF942272C0625FEC78BAC" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_D586A38C09F91EC6C5430625FEC7C356" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LoopnetMember" xlink:label="loc_csgp_LoopnetMember_0B0838325475DC0FF2CE0625FEC76C80" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_D586A38C09F91EC6C5430625FEC7C356" xlink:to="loc_csgp_LoopnetMember_0B0838325475DC0FF2CE0625FEC76C80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_9BADE559A526187AF0590625FEC705EE" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_AF8422C3F0F59E45B6E00625FEC70FC8" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9BADE559A526187AF0590625FEC705EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_FE6C887E8917BEC989ED0625FEC7A014" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9BADE559A526187AF0590625FEC705EE" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_FE6C887E8917BEC989ED0625FEC7A014" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesPayableToBanksMember" xlink:label="loc_us-gaap_NotesPayableToBanksMember_1D62123CC693E321A9CD0625FEC77F6F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_FE6C887E8917BEC989ED0625FEC7A014" xlink:to="loc_us-gaap_NotesPayableToBanksMember_1D62123CC693E321A9CD0625FEC77F6F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMember" xlink:label="loc_us-gaap_LongTermDebtMember_E61B91648904DBB2E2750625FEC7DBE3" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_FE6C887E8917BEC989ED0625FEC7A014" xlink:to="loc_us-gaap_LongTermDebtMember_E61B91648904DBB2E2750625FEC7DBE3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_7FE366EE791791D6FA3C0625FEC7CC6B" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_FE6C887E8917BEC989ED0625FEC7A014" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_7FE366EE791791D6FA3C0625FEC7CC6B" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SwinglineLoanMember" xlink:label="loc_csgp_SwinglineLoanMember_8C4631E724005B29D7610625FEC7396C" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_FE6C887E8917BEC989ED0625FEC7A014" xlink:to="loc_csgp_SwinglineLoanMember_8C4631E724005B29D7610625FEC7396C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_8A580CD5F318DF1B8E380625FEC71D12" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_FE6C887E8917BEC989ED0625FEC7A014" xlink:to="loc_us-gaap_LetterOfCreditMember_8A580CD5F318DF1B8E380625FEC71D12" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_AF8422C3F0F59E45B6E00625FEC70FC8" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_FFFBFBF1D7B9F3EC7D330625FEC78DEC" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_FFFBFBF1D7B9F3EC7D330625FEC78DEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_ED4594F301B9BEE8FB6C0625FEC7AE8C" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_DebtInstrumentTerm_ED4594F301B9BEE8FB6C0625FEC7AE8C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_220465307F8DC72E41AC0625FEC78E10" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_220465307F8DC72E41AC0625FEC78E10" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F202A236346E4B349E8C0625FEC78E22" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F202A236346E4B349E8C0625FEC78E22" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PercentageOfLoanAmortizationInYearOne" xlink:label="loc_csgp_PercentageOfLoanAmortizationInYearOne_94890323CC4B976C84230625FEC71A52" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_PercentageOfLoanAmortizationInYearOne_94890323CC4B976C84230625FEC71A52" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PercentageOfLoanAmortizationInYearTwo" xlink:label="loc_csgp_PercentageOfLoanAmortizationInYearTwo_EE0E74D6F425C5A654090625FEC7EAD6" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_PercentageOfLoanAmortizationInYearTwo_EE0E74D6F425C5A654090625FEC7EAD6" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PercentageOfLoanAmortizationInYearThree" xlink:label="loc_csgp_PercentageOfLoanAmortizationInYearThree_61FE5E53621F3C8925BF0625FEC7FEF3" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_PercentageOfLoanAmortizationInYearThree_61FE5E53621F3C8925BF0625FEC7FEF3" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PercentageOfLoanAmortizationInYearFour" xlink:label="loc_csgp_PercentageOfLoanAmortizationInYearFour_DE9735C59F6D7ABF99130625FEC77532" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_PercentageOfLoanAmortizationInYearFour_DE9735C59F6D7ABF99130625FEC77532" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PercentageOfLoanAmortizationInYearFive" xlink:label="loc_csgp_PercentageOfLoanAmortizationInYearFive_DCD50DA3387AD6EFC1AA0625FEC736CC" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_PercentageOfLoanAmortizationInYearFive_DCD50DA3387AD6EFC1AA0625FEC736CC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_38C775EF7EAEA0E69E5D0625FEC73A78" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_38C775EF7EAEA0E69E5D0625FEC73A78" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_LiborMaturityPeriod" xlink:label="loc_csgp_LiborMaturityPeriod_FDDA59119D55D928F4590625FEC7C422" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_LiborMaturityPeriod_FDDA59119D55D928F4590625FEC7C422" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_DebtInstrumentBasisSpreadOnVariableRateOneMonthInterestPeriod" xlink:label="loc_csgp_DebtInstrumentBasisSpreadOnVariableRateOneMonthInterestPeriod_24EF083779739220B2870625FEC7AD39" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_DebtInstrumentBasisSpreadOnVariableRateOneMonthInterestPeriod_24EF083779739220B2870625FEC7AD39" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_DebtInstrumentBasisSpreadOnVariableRatePerAnnum" xlink:label="loc_csgp_DebtInstrumentBasisSpreadOnVariableRatePerAnnum_5FF3CF9FAAD4E47565700625FED73134" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_DebtInstrumentBasisSpreadOnVariableRatePerAnnum_5FF3CF9FAAD4E47565700625FED73134" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_DefaultInterestRateSpreadPerAnnum" xlink:label="loc_csgp_DefaultInterestRateSpreadPerAnnum_9B54DC3AF547DE97E7940625FED718D1" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_DefaultInterestRateSpreadPerAnnum_9B54DC3AF547DE97E7940625FED718D1" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_MaximumDebtServiceCoverageRatio" xlink:label="loc_csgp_MaximumDebtServiceCoverageRatio_BA13D1694A146EF79B610625FED74880" xlink:type="locator" />
    <presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_MaximumDebtServiceCoverageRatio_BA13D1694A146EF79B610625FED74880" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_MaximumTotalLeverageRatioForFifthThroughEighthQuartersAfterClosingDate" xlink:label="loc_csgp_MaximumTotalLeverageRatioForFifthThroughEighthQuartersAfterClosingDate_A3B2A85632AE3E7EE5C90625FED7844C" xlink:type="locator" />
    <presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_MaximumTotalLeverageRatioForFifthThroughEighthQuartersAfterClosingDate_A3B2A85632AE3E7EE5C90625FED7844C" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_MaximumTotalLeverageRatioAfterEightFiscalQuarters" xlink:label="loc_csgp_MaximumTotalLeverageRatioAfterEightFiscalQuarters_84A96A3B809A41B643560625FED7CC62" xlink:type="locator" />
    <presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_MaximumTotalLeverageRatioAfterEightFiscalQuarters_84A96A3B809A41B643560625FED7CC62" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ExcessCashFlowPaymentMaturityPeriodWithinIssuanceOfFinancialStatements" xlink:label="loc_csgp_ExcessCashFlowPaymentMaturityPeriodWithinIssuanceOfFinancialStatements_B3623DC6CD66981309A10625FED72A89" xlink:type="locator" />
    <presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_ExcessCashFlowPaymentMaturityPeriodWithinIssuanceOfFinancialStatements_B3623DC6CD66981309A10625FED72A89" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_FirstExcessCashFlowRepaymentPercentage" xlink:label="loc_csgp_FirstExcessCashFlowRepaymentPercentage_E8074AFF2DD170854AD90625FED7003F" xlink:type="locator" />
    <presentationArc order="19" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_FirstExcessCashFlowRepaymentPercentage_E8074AFF2DD170854AD90625FED7003F" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_FirstExcessCashFlowRepaymentRequirement" xlink:label="loc_csgp_FirstExcessCashFlowRepaymentRequirement_CFC1CA60835B33D8B3DE0625FED781BB" xlink:type="locator" />
    <presentationArc order="20" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_FirstExcessCashFlowRepaymentRequirement_CFC1CA60835B33D8B3DE0625FED781BB" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SecondExcessCashFlowRepaymentRequirement" xlink:label="loc_csgp_SecondExcessCashFlowRepaymentRequirement_0792D2A2D325FA639A5E0625FED79540" xlink:type="locator" />
    <presentationArc order="21" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_SecondExcessCashFlowRepaymentRequirement_0792D2A2D325FA639A5E0625FED79540" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SecondExcessCashFlowRepaymentPercentage" xlink:label="loc_csgp_SecondExcessCashFlowRepaymentPercentage_D1C3F5DD40F46CCDE6200625FED7333A" xlink:type="locator" />
    <presentationArc order="22" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_SecondExcessCashFlowRepaymentPercentage_D1C3F5DD40F46CCDE6200625FED7333A" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ThirdExcessCashFlowRepaymentRequirement" xlink:label="loc_csgp_ThirdExcessCashFlowRepaymentRequirement_E4535B58B15E526412C20625FED7797D" xlink:type="locator" />
    <presentationArc order="23" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_ThirdExcessCashFlowRepaymentRequirement_E4535B58B15E526412C20625FED7797D" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ThirdExcessCashFlowRepaymentPercentage" xlink:label="loc_csgp_ThirdExcessCashFlowRepaymentPercentage_E8D690483BBCF5D24C6F0625FED734CD" xlink:type="locator" />
    <presentationArc order="24" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_ThirdExcessCashFlowRepaymentPercentage_E8D690483BBCF5D24C6F0625FED734CD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_03A5F78A50EB9D8BD4D90625FED7C198" xlink:type="locator" />
    <presentationArc order="25" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_03A5F78A50EB9D8BD4D90625FED7C198" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_DebtIssuanceUnderwritingFees" xlink:label="loc_csgp_DebtIssuanceUnderwritingFees_52902FF944F85CB547D90625FED7D197" xlink:type="locator" />
    <presentationArc order="26" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_DebtIssuanceUnderwritingFees_52902FF944F85CB547D90625FED7D197" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_DebtIssuanceLegalFees" xlink:label="loc_csgp_DebtIssuanceLegalFees_20A8FDD6DC747775E8660625FED70CB9" xlink:type="locator" />
    <presentationArc order="27" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_csgp_DebtIssuanceLegalFees_20A8FDD6DC747775E8660625FED70CB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="loc_us-gaap_InterestExpenseDebt_1BA67EF36671739A62210625FED744CE" xlink:type="locator" />
    <presentationArc order="28" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_InterestExpenseDebt_1BA67EF36671739A62210625FED744CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_6C195A4E70EDF94AF5D60625FED7FCD7" xlink:type="locator" />
    <presentationArc order="29" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_6C195A4E70EDF94AF5D60625FED7FCD7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestPaid" xlink:label="loc_us-gaap_InterestPaid_CE05B009BCFBB78125A70625FED7129A" xlink:type="locator" />
    <presentationArc order="30" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_969D0ABBEC293B01775F0625FEC7E21F" xlink:to="loc_us-gaap_InterestPaid_CE05B009BCFBB78125A70625FED7129A" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/LongTermDebtScheduleOfMaturitiesOfLongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtCurrentAndNoncurrentAbstract" xlink:label="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5D1F19EC60EAEDD5E06A939D9E9DFB7F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_2179003D681DAF60A792939D9E9DEB47" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5D1F19EC60EAEDD5E06A939D9E9DFB7F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_2179003D681DAF60A792939D9E9DEB47" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_3A4C0E5433ADEC5C76DB939D9E9D7CC8" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5D1F19EC60EAEDD5E06A939D9E9DFB7F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_3A4C0E5433ADEC5C76DB939D9E9D7CC8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_FAAEF3172779838A4400939D9E9D94C1" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5D1F19EC60EAEDD5E06A939D9E9DFB7F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_FAAEF3172779838A4400939D9E9D94C1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_46950609E9545C995DC1939D9E9DC48E" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5D1F19EC60EAEDD5E06A939D9E9DFB7F" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_46950609E9545C995DC1939D9E9DC48E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_7C47BA8B34C650FF57BC939D9E9D4C1B" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_5D1F19EC60EAEDD5E06A939D9E9DFB7F" xlink:to="loc_us-gaap_LongTermDebt_7C47BA8B34C650FF57BC939D9E9D4C1B" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/LongTermDebtTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtCurrentAndNoncurrentAbstract" xlink:label="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_3688CF7D4339864CC42A0625FDEDFCD7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_81FB2035A37FEEC8D9770625FDEDF399" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtCurrentAndNoncurrentAbstract_3688CF7D4339864CC42A0625FDEDFCD7" xlink:to="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_81FB2035A37FEEC8D9770625FDEDF399" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/NetIncomePerShare" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_5DE148084769C5A527A4FF4B569A80D5" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="loc_us-gaap_EarningsPerShareTextBlock_3D37B35E19D1D1F53F9AFF4B569AFA07" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_5DE148084769C5A527A4FF4B569A80D5" xlink:to="loc_us-gaap_EarningsPerShareTextBlock_3D37B35E19D1D1F53F9AFF4B569AFA07" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/NetIncomePerShareDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_CE59C2688E5093C3FAB5094A3E65E39D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareReconciliationAbstract" xlink:label="loc_us-gaap_EarningsPerShareReconciliationAbstract_0859B5BF259BA1123D34094A3E65A200" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_CE59C2688E5093C3FAB5094A3E65E39D" xlink:to="loc_us-gaap_EarningsPerShareReconciliationAbstract_0859B5BF259BA1123D34094A3E65A200" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_DF02527803D85F64D5F7094A3E656D14" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareReconciliationAbstract_0859B5BF259BA1123D34094A3E65A200" xlink:to="loc_us-gaap_NetIncomeLoss_DF02527803D85F64D5F7094A3E656D14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_B1D46C5276550D08D6B9094A3E657FED" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_CE59C2688E5093C3FAB5094A3E65E39D" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_B1D46C5276550D08D6B9094A3E657FED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_6F1267B95A70E6E15642094A3E653B25" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_B1D46C5276550D08D6B9094A3E657FED" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_6F1267B95A70E6E15642094A3E653B25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DilutiveSecuritiesAbstract" xlink:label="loc_us-gaap_DilutiveSecuritiesAbstract_D2FDC397AD10A720A9F5094A3E651441" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_CE59C2688E5093C3FAB5094A3E65E39D" xlink:to="loc_us-gaap_DilutiveSecuritiesAbstract_D2FDC397AD10A720A9F5094A3E651441" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_98CB3A9802F2383CE206094A3E656A8F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DilutiveSecuritiesAbstract_D2FDC397AD10A720A9F5094A3E651441" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_98CB3A9802F2383CE206094A3E656A8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F4AF6F5AB66326D699FD094A3E650122" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DilutiveSecuritiesAbstract_D2FDC397AD10A720A9F5094A3E651441" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F4AF6F5AB66326D699FD094A3E650122" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_E46DE32DD110FB76E7E9094A3E65A894" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_CE59C2688E5093C3FAB5094A3E65E39D" xlink:to="loc_us-gaap_EarningsPerShareBasic_E46DE32DD110FB76E7E9094A3E65A894" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_266CE74526FA38BA43FC094A3E65109E" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_CE59C2688E5093C3FAB5094A3E65E39D" xlink:to="loc_us-gaap_EarningsPerShareDiluted_266CE74526FA38BA43FC094A3E65109E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_2B3C05203075E18181BA094A3E650D24" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_CE59C2688E5093C3FAB5094A3E65E39D" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_2B3C05203075E18181BA094A3E650D24" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6D6A0F25FEA33D76D557094A3E65DF1A" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_2B3C05203075E18181BA094A3E650D24" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6D6A0F25FEA33D76D557094A3E65DF1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_418AE99C47C7D298177E094A3E651D64" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6D6A0F25FEA33D76D557094A3E65DF1A" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_418AE99C47C7D298177E094A3E651D64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_9AC30B7C7D20FED5A7BF094A3E65295D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_418AE99C47C7D298177E094A3E651D64" xlink:to="loc_us-gaap_EmployeeStockOptionMember_9AC30B7C7D20FED5A7BF094A3E65295D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_BB729504BFD8C110C07F094A3E656DAB" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_2B3C05203075E18181BA094A3E650D24" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_BB729504BFD8C110C07F094A3E656DAB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_E7A24BAC56D5605C2638094A3E65350D" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_BB729504BFD8C110C07F094A3E656DAB" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_E7A24BAC56D5605C2638094A3E65350D" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/NetIncomePerShareTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_A7BFAD42AE2D52FDF776FF4B5755E1AB" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_B1CF5CFE21E1CC4A3B36FF4B5755CC03" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareAbstract_A7BFAD42AE2D52FDF776FF4B5755E1AB" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_B1CF5CFE21E1CC4A3B36FF4B5755CC03" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/Organization" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_323E6CE50135BF57252FFF4B56D8B0A3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NatureOfOperations" xlink:label="loc_us-gaap_NatureOfOperations_D381668C7420C6FBF71EFF4B56D8367F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_323E6CE50135BF57252FFF4B56D8B0A3" xlink:to="loc_us-gaap_NatureOfOperations_D381668C7420C6FBF71EFF4B56D8367F" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/OrganizationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_E516511859E8F52917F1FF4B56D83519" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="loc_us-gaap_NumberOfOperatingSegments_F76ECFB990A855B62F2EFF4B56D8036F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_E516511859E8F52917F1FF4B56D83519" xlink:to="loc_us-gaap_NumberOfOperatingSegments_F76ECFB990A855B62F2EFF4B56D8036F" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SubscriptionBasedLicensingAgreementMinimumTermYears" xlink:label="loc_csgp_SubscriptionBasedLicensingAgreementMinimumTermYears_C1E6A7F167EE0E55EEC6FF4B56D8D899" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_E516511859E8F52917F1FF4B56D83519" xlink:to="loc_csgp_SubscriptionBasedLicensingAgreementMinimumTermYears_C1E6A7F167EE0E55EEC6FF4B56D8D899" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/PropertyAndEquipment" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_EE68456563E671E34CAAFF4B574511B8" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_E8631DD6027B09AFF4EFFF4B5745D634" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_EE68456563E671E34CAAFF4B574511B8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_E8631DD6027B09AFF4EFFF4B5745D634" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/PropertyAndEquipmentDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_C68FC73BB09171A5A47BFF4B569A9CD9" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BF6800AE1E74E4A46E5BFF4B569A7E6C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_C68FC73BB09171A5A47BFF4B569A9CD9" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BF6800AE1E74E4A46E5BFF4B569A7E6C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7CB65CA6F04657C42C25FF4B569AA102" xlink:type="locator" />
    <presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BF6800AE1E74E4A46E5BFF4B569A7E6C" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7CB65CA6F04657C42C25FF4B569AA102" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_753043788408F43351D7FF4B569A4B2B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7CB65CA6F04657C42C25FF4B569AA102" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_753043788408F43351D7FF4B569A4B2B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_BD478E923889F0F29019FF4B569A7F17" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_753043788408F43351D7FF4B569A4B2B" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_BD478E923889F0F29019FF4B569A7F17" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_FEE07321B219D51251D3FF4B569A763A" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_753043788408F43351D7FF4B569A4B2B" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_FEE07321B219D51251D3FF4B569A763A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaap_ComputerEquipmentMember_C557CAF81496C0D74C78FF4B569AAFEF" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_753043788408F43351D7FF4B569A4B2B" xlink:to="loc_us-gaap_ComputerEquipmentMember_C557CAF81496C0D74C78FF4B569AAFEF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0BB87F3AA93A06C76CCCFF4B569A5E36" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BF6800AE1E74E4A46E5BFF4B569A7E6C" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0BB87F3AA93A06C76CCCFF4B569A5E36" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_3F746173BD5C83B2FCE5FF4B569AF070" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0BB87F3AA93A06C76CCCFF4B569A5E36" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_3F746173BD5C83B2FCE5FF4B569AF070" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_604D74ADB8FCAFE1F68AFF4B569A8CF9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0BB87F3AA93A06C76CCCFF4B569A5E36" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_604D74ADB8FCAFE1F68AFF4B569A8CF9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_5F0AADE870897272E583FF4B569AF557" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0BB87F3AA93A06C76CCCFF4B569A5E36" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_5F0AADE870897272E583FF4B569AF557" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_CADF57EEA06DB2BF0E92FF4B569ADEC0" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0BB87F3AA93A06C76CCCFF4B569A5E36" xlink:to="loc_us-gaap_Depreciation_CADF57EEA06DB2BF0E92FF4B569ADEC0" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/PropertyAndEquipmentTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_F31A57ACAF5541CE7288FF4B56D8ED60" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_5E7161FAA176E60B5581FF4B56D8F4DE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_F31A57ACAF5541CE7288FF4B56D8ED60" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_5E7161FAA176E60B5581FF4B56D8F4DE" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ScheduleIiValuationAndQualifyingAccounts" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsAbstract" xlink:label="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_65624C9B54BDA7C65391FF4B56C9F788" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock" xlink:label="loc_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_9D975384E78AECBBEAEFFF4B56C9338C" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_65624C9B54BDA7C65391FF4B56C9F788" xlink:to="loc_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_9D975384E78AECBBEAEFFF4B56C9338C" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ScheduleIiValuationAndQualifyingAccountsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsAbstract" xlink:label="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_22A20D47AF0ED1C21630FF4B56E84799" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_ABEA21C11A507A7A3ECEFF4B56E84B80" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_22A20D47AF0ED1C21630FF4B56E84799" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_ABEA21C11A507A7A3ECEFF4B56E84B80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_14C3B14571D1A0E54A95FF4B56E8B893" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_22A20D47AF0ED1C21630FF4B56E84799" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_14C3B14571D1A0E54A95FF4B56E8B893" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_701F84E3187194610458FF4B56E83F81" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_22A20D47AF0ED1C21630FF4B56E84799" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_701F84E3187194610458FF4B56E83F81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_5A2D55C22873B5B70E3AFF4B56E8AD74" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_22A20D47AF0ED1C21630FF4B56E84799" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_5A2D55C22873B5B70E3AFF4B56E8AD74" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_5617CBF604CCA071CE56FF4B56E8D6EB" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_22A20D47AF0ED1C21630FF4B56E84799" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_5617CBF604CCA071CE56FF4B56E8D6EB" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/ScheduleIiValuationAndQualifyingAccountsTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsAbstract" xlink:label="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_3AB2D85F2AC80E3030DAFF4B56C9E4BF" xlink:type="locator" />
    <loc xlink:href="csgp-20131231.xsd#csgp_AllowanceForDoubtfulAccountsAndBillingAdjustmentsTableTextBlock" xlink:label="loc_csgp_AllowanceForDoubtfulAccountsAndBillingAdjustmentsTableTextBlock_FB99213676417D9B0C74FF4B56C9E3F9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsAbstract_3AB2D85F2AC80E3030DAFF4B56C9E4BF" xlink:to="loc_csgp_AllowanceForDoubtfulAccountsAndBillingAdjustmentsTableTextBlock_FB99213676417D9B0C74FF4B56C9E3F9" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SegmentReporting" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_10F6BACEB39D34A6E28AFF4B56F7753A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="loc_us-gaap_SegmentReportingDisclosureTextBlock_1CDFE2B1F4934745E275FF4B56F71ED6" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_10F6BACEB39D34A6E28AFF4B56F7753A" xlink:to="loc_us-gaap_SegmentReportingDisclosureTextBlock_1CDFE2B1F4934745E275FF4B56F71ED6" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SegmentReportingDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_BF262982AF41640454F207FB6EF0F638" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_52B6964240F415E3F3D007FB6EF046B0" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_BF262982AF41640454F207FB6EF0F638" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_52B6964240F415E3F3D007FB6EF046B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_F934F3CDE02541F7511C07FB6EFFA668" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_52B6964240F415E3F3D007FB6EF046B0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_F934F3CDE02541F7511C07FB6EFFA668" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_DFE9B1B5D841359BF69707FB6EFF8169" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_F934F3CDE02541F7511C07FB6EFFA668" xlink:to="loc_us-gaap_SegmentDomain_DFE9B1B5D841359BF69707FB6EFF8169" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_UnitedStatesMember" xlink:label="loc_csgp_UnitedStatesMember_9D64C884E2EBBFD810BC07FB6EFFB63B" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_DFE9B1B5D841359BF69707FB6EFF8169" xlink:to="loc_csgp_UnitedStatesMember_9D64C884E2EBBFD810BC07FB6EFFB63B" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_InternationalMember" xlink:label="loc_csgp_InternationalMember_4762FCE80FF835C1048E07FB6EFFCAC5" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_DFE9B1B5D841359BF69707FB6EFF8169" xlink:to="loc_csgp_InternationalMember_4762FCE80FF835C1048E07FB6EFFCAC5" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ExternalCustomersMember" xlink:label="loc_csgp_ExternalCustomersMember_E9E5116A1AAF08BA3A0007FB6EFFE5CE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_InternationalMember_4762FCE80FF835C1048E07FB6EFFCAC5" xlink:to="loc_csgp_ExternalCustomersMember_E9E5116A1AAF08BA3A0007FB6EFFE5CE" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_IntersegmentRevenueMember" xlink:label="loc_csgp_IntersegmentRevenueMember_88403AC0B9EE4F0EC9CB07FB6EFF34FE" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_InternationalMember_4762FCE80FF835C1048E07FB6EFFCAC5" xlink:to="loc_csgp_IntersegmentRevenueMember_88403AC0B9EE4F0EC9CB07FB6EFF34FE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_DC3F26D93B037A585DA207FB6EFF3526" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentDomain_DFE9B1B5D841359BF69707FB6EFF8169" xlink:to="loc_us-gaap_IntersegmentEliminationMember_DC3F26D93B037A585DA207FB6EFF3526" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_52B6964240F415E3F3D007FB6EF046B0" xlink:to="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="loc_us-gaap_NumberOfOperatingSegments_2E01486E1EC63EABCC8007FB6EFF1924" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:to="loc_us-gaap_NumberOfOperatingSegments_2E01486E1EC63EABCC8007FB6EFF1924" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_CorporateAllocationUs" xlink:label="loc_csgp_CorporateAllocationUs_ABEE7A2805FA37195C2007FB6EFFF608" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:to="loc_csgp_CorporateAllocationUs_ABEE7A2805FA37195C2007FB6EFFF608" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_CorporateAllocation" xlink:label="loc_csgp_CorporateAllocation_62831960880D076F9F1307FB6EFFAC68" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:to="loc_csgp_CorporateAllocation_62831960880D076F9F1307FB6EFFAC68" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingInformationAdditionalInformationAbstract" xlink:label="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_B5E000929CAC092B2B0607FB6EFFBDAE" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:to="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_B5E000929CAC092B2B0607FB6EFFBDAE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_F5EC0748DD9CF0EC362507FB6EFF00E2" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_B5E000929CAC092B2B0607FB6EFFBDAE" xlink:to="loc_us-gaap_Revenues_F5EC0748DD9CF0EC362507FB6EFF00E2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_4AEE37F067A9883E042107FB6EFF8943" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_B5E000929CAC092B2B0607FB6EFFBDAE" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_4AEE37F067A9883E042107FB6EFF8943" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_89EF8F61E6836A53FA3B07FB6EFF0B24" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationAdditionalInformationAbstract_B5E000929CAC092B2B0607FB6EFFBDAE" xlink:to="loc_us-gaap_Goodwill_89EF8F61E6836A53FA3B07FB6EFF0B24" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_928A8AA2713741F6134C07FB6EFFAC56" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_928A8AA2713741F6134C07FB6EFFAC56" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfGoodsSoldAmortization" xlink:label="loc_us-gaap_CostOfGoodsSoldAmortization_878835A2750E10B3AD3E07FB6EFF7045" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:to="loc_us-gaap_CostOfGoodsSoldAmortization_878835A2750E10B3AD3E07FB6EFF7045" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_55C1672483A7F9834A8207FB6EFF2DD4" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_55C1672483A7F9834A8207FB6EFF2DD4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_8142F1DB876C8EE519DC07FB6EFF0F48" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_8142F1DB876C8EE519DC07FB6EFF0F48" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_CDAF570560666A25CDDE07FB6EFF67DA" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:to="loc_us-gaap_InvestmentIncomeInterest_CDAF570560666A25CDDE07FB6EFF67DA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_7588109841253B80F54207FB6EFF5EB4" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:to="loc_us-gaap_InterestExpense_7588109841253B80F54207FB6EFF5EB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_9993EA7ED8D7ABC41E1507FB6EFFBA6F" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_9993EA7ED8D7ABC41E1507FB6EFFBA6F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_B7F79DB545D351EAA3F707FB6EFFD15C" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_9942D2C30C50F0BB3F8A07FB6EFFE0C8" xlink:to="loc_us-gaap_NetIncomeLoss_B7F79DB545D351EAA3F707FB6EFFD15C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract" xlink:label="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_88314304087B53FC743207FB6EFFCCF1" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:to="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_88314304087B53FC743207FB6EFFCCF1" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SegmentReportingSegmentGrossAssets" xlink:label="loc_csgp_SegmentReportingSegmentGrossAssets_29262A22E3A46AFC850B07FB6EFFA0D9" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_88314304087B53FC743207FB6EFFCCF1" xlink:to="loc_csgp_SegmentReportingSegmentGrossAssets_29262A22E3A46AFC850B07FB6EFFA0D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_C69C816E65670713E3A907FB6EFF53C4" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_88314304087B53FC743207FB6EFFCCF1" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_C69C816E65670713E3A907FB6EFF53C4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsReceivableRelatedParties" xlink:label="loc_us-gaap_AccountsReceivableRelatedParties_D7D527E213DCCB0E648107FB6EFF93AC" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_88314304087B53FC743207FB6EFFCCF1" xlink:to="loc_us-gaap_AccountsReceivableRelatedParties_D7D527E213DCCB0E648107FB6EFF93AC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_CF851E790C70283C6F6B07FB6EFF5537" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_88314304087B53FC743207FB6EFFCCF1" xlink:to="loc_us-gaap_Assets_CF851E790C70283C6F6B07FB6EFF5537" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ReconciliationOfSegmentLiabilitiesToTotalLiabilitiesAbstract" xlink:label="loc_csgp_ReconciliationOfSegmentLiabilitiesToTotalLiabilitiesAbstract_9BF8E321D1B5CD5355E107FB6EFF1820" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_329B087C7A3A391BF92507FB6EFF7382" xlink:to="loc_csgp_ReconciliationOfSegmentLiabilitiesToTotalLiabilitiesAbstract_9BF8E321D1B5CD5355E107FB6EFF1820" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_TotalSegmentLiabilities" xlink:label="loc_csgp_TotalSegmentLiabilities_8A273A1BE630F1959C8D07FB6EFFD407" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_ReconciliationOfSegmentLiabilitiesToTotalLiabilitiesAbstract_9BF8E321D1B5CD5355E107FB6EFF1820" xlink:to="loc_csgp_TotalSegmentLiabilities_8A273A1BE630F1959C8D07FB6EFFD407" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent_F4E2EA8F10319454DC4907FB6EFF8B14" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_ReconciliationOfSegmentLiabilitiesToTotalLiabilitiesAbstract_9BF8E321D1B5CD5355E107FB6EFF1820" xlink:to="loc_us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent_F4E2EA8F10319454DC4907FB6EFF8B14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_218B3EEB6A65A36B207D07FB6EFF7729" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_ReconciliationOfSegmentLiabilitiesToTotalLiabilitiesAbstract_9BF8E321D1B5CD5355E107FB6EFF1820" xlink:to="loc_us-gaap_Liabilities_218B3EEB6A65A36B207D07FB6EFF7729" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SegmentReportingTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_E03C16615DF738191B1FFF4B5745FCAD" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_86490D61AAB2A662A635FF4B5745E4AF" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_E03C16615DF738191B1FFF4B5745FCAD" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_86490D61AAB2A662A635FF4B5745E4AF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_DE024F881320FAD38E63FF4B574556BD" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_E03C16615DF738191B1FFF4B5745FCAD" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_DE024F881320FAD38E63FF4B574556BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock" xlink:label="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_94F21A4BDF3AD2315D1CFF4B57453036" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_E03C16615DF738191B1FFF4B5745FCAD" xlink:to="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_94F21A4BDF3AD2315D1CFF4B57453036" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/StockholdersEquity" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract" xlink:label="loc_us-gaap_StockholdersEquityNoteAbstract_52009ECE0C8558CB2CE5FF4B56E84DA8" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_7E14DD1F9C7F9A373DC0FF4B56E87D64" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityNoteAbstract_52009ECE0C8558CB2CE5FF4B56E84DA8" xlink:to="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_7E14DD1F9C7F9A373DC0FF4B56E87D64" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/StockholdersEquityDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract" xlink:label="loc_us-gaap_StockholdersEquityNoteAbstract_B83409CEFE2B78E9EFB3FF4B56A92E5D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockNumberOfSharesParValueAndOtherDisclosuresAbstract" xlink:label="loc_us-gaap_PreferredStockNumberOfSharesParValueAndOtherDisclosuresAbstract_29C93CFCCF4B12A49876FF4B56A91F40" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityNoteAbstract_B83409CEFE2B78E9EFB3FF4B56A92E5D" xlink:to="loc_us-gaap_PreferredStockNumberOfSharesParValueAndOtherDisclosuresAbstract_29C93CFCCF4B12A49876FF4B56A91F40" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_811EBCA572067D2313B6FF4B56A9E295" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PreferredStockNumberOfSharesParValueAndOtherDisclosuresAbstract_29C93CFCCF4B12A49876FF4B56A91F40" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_811EBCA572067D2313B6FF4B56A9E295" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_D03B090CAA5FAEC172CBFF4B56A9EEE6" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PreferredStockNumberOfSharesParValueAndOtherDisclosuresAbstract_29C93CFCCF4B12A49876FF4B56A91F40" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_D03B090CAA5FAEC172CBFF4B56A9EEE6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract" xlink:label="loc_us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract_6187595317C12231CB76FF4B56A9299E" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityNoteAbstract_B83409CEFE2B78E9EFB3FF4B56A92E5D" xlink:to="loc_us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract_6187595317C12231CB76FF4B56A9299E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_BFBBBCB94E4E3566A370FF4B56A97297" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract_6187595317C12231CB76FF4B56A9299E" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_BFBBBCB94E4E3566A370FF4B56A97297" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_3A3C6979871722183AD9FF4B56A9728E" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract_6187595317C12231CB76FF4B56A9299E" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_3A3C6979871722183AD9FF4B56A9728E" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_IncreaseInSharesAuthorized" xlink:label="loc_csgp_IncreaseInSharesAuthorized_616B30187A67F46B5EE5FF4B56A9462D" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract_6187595317C12231CB76FF4B56A9299E" xlink:to="loc_csgp_IncreaseInSharesAuthorized_616B30187A67F46B5EE5FF4B56A9462D" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_8FCCE0AB3A4367D91809FF4B5765468C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock_1F9D07EB684363EA7D13FF4B5765AA6F" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_8FCCE0AB3A4367D91809FF4B5765468C" xlink:to="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock_1F9D07EB684363EA7D13FF4B5765AA6F" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesAccumulatedOtherComprehensiveIncomeLossNetOfTaxDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_FAC3C01FCEA5A23EF872FF4B56B94231" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_7924699AE6F048523819FF4B56B97173" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_FAC3C01FCEA5A23EF872FF4B56B94231" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_7924699AE6F048523819FF4B56B97173" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_CA25F986510015ECF361FF4B56B9E603" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_7924699AE6F048523819FF4B56B97173" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_CA25F986510015ECF361FF4B56B9E603" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_DFA7904EBB81E26EDE3EFF4B56B9D4CB" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_7924699AE6F048523819FF4B56B97173" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_DFA7904EBB81E26EDE3EFF4B56B9D4CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_F0AC386557324BB3BCC8FF4B56B9CD59" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract_7924699AE6F048523819FF4B56B97173" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_F0AC386557324BB3BCC8FF4B56B9CD59" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_36CC2B9DBE8CB264463330B09A2D8D49" xlink:type="locator" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SummaryOfSignificantAccountingPoliciesTable" xlink:label="loc_csgp_SummaryOfSignificantAccountingPoliciesTable_B67FDDF1C61189BF922130B09A2D51F1" xlink:type="locator" />
    <presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_36CC2B9DBE8CB264463330B09A2D8D49" xlink:to="loc_csgp_SummaryOfSignificantAccountingPoliciesTable_B67FDDF1C61189BF922130B09A2D51F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_AC46BAB72645E4D6272030B09A2D1400" xlink:type="locator" />
    <presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesTable_B67FDDF1C61189BF922130B09A2D51F1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_AC46BAB72645E4D6272030B09A2D1400" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EF0E8327C8F5CD35272430B09A2D04EA" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_AC46BAB72645E4D6272030B09A2D1400" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EF0E8327C8F5CD35272430B09A2D04EA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DatabasesMember" xlink:label="loc_us-gaap_DatabasesMember_DB350E0EF223206E176830B09A2D2FF5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EF0E8327C8F5CD35272430B09A2D04EA" xlink:to="loc_us-gaap_DatabasesMember_DB350E0EF223206E176830B09A2D2FF5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="loc_us-gaap_TradeNamesMember_7398189AE6403266641830B09A2D5C95" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EF0E8327C8F5CD35272430B09A2D04EA" xlink:to="loc_us-gaap_TradeNamesMember_7398189AE6403266641830B09A2D5C95" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CustomerContractsMember" xlink:label="loc_us-gaap_CustomerContractsMember_DFD55A1F2F8F86FCF2AC30B09A2D838B" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EF0E8327C8F5CD35272430B09A2D04EA" xlink:to="loc_us-gaap_CustomerContractsMember_DFD55A1F2F8F86FCF2AC30B09A2D838B" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_BuildingPhotographyMember" xlink:label="loc_csgp_BuildingPhotographyMember_2300527CA0A28411911630B09A2D86DD" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EF0E8327C8F5CD35272430B09A2D04EA" xlink:to="loc_csgp_BuildingPhotographyMember_2300527CA0A28411911630B09A2D86DD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_1EE2F1DB094BEFF330BB30B09A2D3A3D" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_EF0E8327C8F5CD35272430B09A2D04EA" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_1EE2F1DB094BEFF330BB30B09A2D3A3D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_AE8CF74E738C5D348A3430B09A2DB5CE" xlink:type="locator" />
    <presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesTable_B67FDDF1C61189BF922130B09A2D51F1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_AE8CF74E738C5D348A3430B09A2DB5CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_898472629CDE5929584030B09A2D76F8" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_AE8CF74E738C5D348A3430B09A2DB5CE" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_898472629CDE5929584030B09A2D76F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_9E2D92E30464126F01FF30B09A2D1F0E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_898472629CDE5929584030B09A2D76F8" xlink:to="loc_us-gaap_BuildingMember_9E2D92E30464126F01FF30B09A2D1F0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_5E070B36CCAEF39FC41E30B09A2DCD63" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_898472629CDE5929584030B09A2D76F8" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_5E070B36CCAEF39FC41E30B09A2DCD63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VehiclesMember" xlink:label="loc_us-gaap_VehiclesMember_D76FD0704EFE342DDAD330B09A2D6FB3" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_898472629CDE5929584030B09A2D76F8" xlink:to="loc_us-gaap_VehiclesMember_D76FD0704EFE342DDAD330B09A2D6FB3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaap_ComputerEquipmentMember_DAF9CADE13341B6E534230B09A2D5C92" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_898472629CDE5929584030B09A2D76F8" xlink:to="loc_us-gaap_ComputerEquipmentMember_DAF9CADE13341B6E534230B09A2D5C92" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_BE0E41487B098FC2370330B09A2D7525" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesTable_B67FDDF1C61189BF922130B09A2D51F1" xlink:to="loc_us-gaap_RangeAxis_BE0E41487B098FC2370330B09A2D7525" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_51D1827832AFB0615EBD30B09A2DC0E0" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeAxis_BE0E41487B098FC2370330B09A2D7525" xlink:to="loc_us-gaap_RangeMember_51D1827832AFB0615EBD30B09A2DC0E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_C5FC2571AD7A65B04AB530B09A2DE67E" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_51D1827832AFB0615EBD30B09A2DC0E0" xlink:to="loc_us-gaap_MinimumMember_C5FC2571AD7A65B04AB530B09A2DE67E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_31FA386A1C610BE26D6A30B09A2D34E2" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RangeMember_51D1827832AFB0615EBD30B09A2DC0E0" xlink:to="loc_us-gaap_MaximumMember_31FA386A1C610BE26D6A30B09A2D34E2" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SummaryOfSignificantAccountingPoliciesLineItems" xlink:label="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:type="locator" />
    <presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesTable_B67FDDF1C61189BF922130B09A2D51F1" xlink:to="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_SubscriptionBasedLicensingAgreementMinimumTermYears" xlink:label="loc_csgp_SubscriptionBasedLicensingAgreementMinimumTermYears_C16B661A5F2C92389B2030B09A2DF372" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_csgp_SubscriptionBasedLicensingAgreementMinimumTermYears_C16B661A5F2C92389B2030B09A2DF372" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_EDDA9B57E2682B2745BE30B09A2D7CDF" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_EDDA9B57E2682B2745BE30B09A2D7CDF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_9D6AD5784A43B781E6FA30B09A2DDA9F" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_9D6AD5784A43B781E6FA30B09A2DDA9F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdvertisingExpense" xlink:label="loc_us-gaap_AdvertisingExpense_3004005EFB7FBC38E31C30B09A2D0579" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_AdvertisingExpense_3004005EFB7FBC38E31C30B09A2D0579" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_MaximumOriginalMaturityOfHighlyLiquidInvestmentsToBeConsideredCashEquivalents" xlink:label="loc_csgp_MaximumOriginalMaturityOfHighlyLiquidInvestmentsToBeConsideredCashEquivalents_2D40C9B425D0F1CBFFB230B09A2DC345" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_csgp_MaximumOriginalMaturityOfHighlyLiquidInvestmentsToBeConsideredCashEquivalents_2D40C9B425D0F1CBFFB230B09A2DC345" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalents" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_07F9F6E82EF9B59ECC2230B09A2D29CF" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_07F9F6E82EF9B59ECC2230B09A2D29CF" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ShortTermInvestmentsMaturityTerm" xlink:label="loc_csgp_ShortTermInvestmentsMaturityTerm_709C7306C6794AEB91D930B09A2D906E" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_csgp_ShortTermInvestmentsMaturityTerm_709C7306C6794AEB91D930B09A2D906E" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_AvailableForSaleShortTermInvestmentContractualMaturities" xlink:label="loc_csgp_AvailableForSaleShortTermInvestmentContractualMaturities_AD68D76738C25FB4236A30B09A2D2DA2" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_csgp_AvailableForSaleShortTermInvestmentContractualMaturities_AD68D76738C25FB4236A30B09A2D2DA2" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_NumberOfCustomersAccoutingForMoreThanFivePercentOfRevenue" xlink:label="loc_csgp_NumberOfCustomersAccoutingForMoreThanFivePercentOfRevenue_F16E157A6192D043F97830B09A2D1E3A" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_csgp_NumberOfCustomersAccoutingForMoreThanFivePercentOfRevenue_F16E157A6192D043F97830B09A2D1E3A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_3F0A79B9A9E01DE9E3BB30B09A2D6E7D" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_3F0A79B9A9E01DE9E3BB30B09A2D6E7D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_A06CBD8D0DFB23FBF66930B09A2D205F" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_A06CBD8D0DFB23FBF66930B09A2D205F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_82C39683193F9A580EC930B09A2D9C25" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_82C39683193F9A580EC930B09A2D9C25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_34BB2D6E43752EECCD9A30B09A2D56AC" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_34BB2D6E43752EECCD9A30B09A2D56AC" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_NumberOfDistinctIntangibleAsset" xlink:label="loc_csgp_NumberOfDistinctIntangibleAsset_A2D1C97D1BC59FA3C4E030B09A2D2CA4" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_csgp_NumberOfDistinctIntangibleAsset_A2D1C97D1BC59FA3C4E030B09A2D2CA4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_EDCFD3FB70667F6D38AF30B09A2D0131" xlink:type="locator" />
    <presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_EDCFD3FB70667F6D38AF30B09A2D0131" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_BC161E9A02A2BE6C0B2930B09A2D22F5" xlink:type="locator" />
    <presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_BC161E9A02A2BE6C0B2930B09A2D22F5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_33CAD1E1FAEF092FA61130B09A2D7C00" xlink:type="locator" />
    <presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_csgp_SummaryOfSignificantAccountingPoliciesLineItems_313FF78E208350AAD5AD30B09A2DD70F" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_33CAD1E1FAEF092FA61130B09A2D7C00" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_FEF64D545B478305D0FDFF4B5745F128" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_ConsolidationPolicyTextBlock_FEF64D545B478305D0FDFF4B5745F128" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_90F2467C7A464989885CFF4B5745C294" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_UseOfEstimates_90F2467C7A464989885CFF4B5745C294" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PriorPeriodReclassificationAdjustmentDescription" xlink:label="loc_us-gaap_PriorPeriodReclassificationAdjustmentDescription_77F672D8E6E1336DB53FFF4B5745E519" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_PriorPeriodReclassificationAdjustmentDescription_77F672D8E6E1336DB53FFF4B5745E519" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="loc_us-gaap_RevenueRecognitionPolicyTextBlock_3A82E04FC46CCBCFE0E8FF4B574592C3" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_RevenueRecognitionPolicyTextBlock_3A82E04FC46CCBCFE0E8FF4B574592C3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfSalesPolicyTextBlock" xlink:label="loc_us-gaap_CostOfSalesPolicyTextBlock_258D10832B7E67892787FF4B5745EBB7" xlink:type="locator" />
    <presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_CostOfSalesPolicyTextBlock_258D10832B7E67892787FF4B5745EBB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:label="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_E202BD6061CC7AF9CFBEFF4B57450A75" xlink:type="locator" />
    <presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_E202BD6061CC7AF9CFBEFF4B57450A75" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_AccumulatedOtherComprehensiveIncomeLossPolicyTextBlock" xlink:label="loc_csgp_AccumulatedOtherComprehensiveIncomeLossPolicyTextBlock_18C63F8556EF8C463FBDFF4B574523A5" xlink:type="locator" />
    <presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_csgp_AccumulatedOtherComprehensiveIncomeLossPolicyTextBlock_18C63F8556EF8C463FBDFF4B574523A5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdvertisingCostsPolicyTextBlock" xlink:label="loc_us-gaap_AdvertisingCostsPolicyTextBlock_33928ECB1898A03C4FEEFF4B5745FBE4" xlink:type="locator" />
    <presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_AdvertisingCostsPolicyTextBlock_33928ECB1898A03C4FEEFF4B5745FBE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_EDD260387169AE4D2BE6FF4B574599B0" xlink:type="locator" />
    <presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_IncomeTaxPolicyTextBlock_EDD260387169AE4D2BE6FF4B574599B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_0A276B65BDBD3E6FABF8FF4B5745B91E" xlink:type="locator" />
    <presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_EarningsPerSharePolicyTextBlock_0A276B65BDBD3E6FABF8FF4B5745B91E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:label="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_B3A7E396DF0549E6F5AEFF4B5745B40C" xlink:type="locator" />
    <presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_B3A7E396DF0549E6F5AEFF4B5745B40C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_19B2D8CDA06069D5139DFF4B5745E756" xlink:type="locator" />
    <presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_19B2D8CDA06069D5139DFF4B5745E756" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentPolicyTextBlock" xlink:label="loc_us-gaap_InvestmentPolicyTextBlock_437583DECA23A95FA7FDFF4B5745AB22" xlink:type="locator" />
    <presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_InvestmentPolicyTextBlock_437583DECA23A95FA7FDFF4B5745AB22" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConcentrationRiskCreditRisk" xlink:label="loc_us-gaap_ConcentrationRiskCreditRisk_7E85AE8A2651D470EBB7FF4B5745C29B" xlink:type="locator" />
    <presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_ConcentrationRiskCreditRisk_7E85AE8A2651D470EBB7FF4B5745C29B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TradeAndOtherAccountsReceivablePolicy" xlink:label="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_E30EEAE0C36653EFB5D7FF4B57451F72" xlink:type="locator" />
    <presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_E30EEAE0C36653EFB5D7FF4B57451F72" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_7FB05EA5A34AE1C835E5FF4B57457C89" xlink:type="locator" />
    <presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_7FB05EA5A34AE1C835E5FF4B57457C89" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_4890309C67544D261B56FF4B5745605C" xlink:type="locator" />
    <presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_4890309C67544D261B56FF4B5745605C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock" xlink:label="loc_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_5FF8D4A3571D4CFC73FCFF4B574566A2" xlink:type="locator" />
    <presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_5FF8D4A3571D4CFC73FCFF4B574566A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_EDC6F01FB126268E6548FF4B57459DE7" xlink:type="locator" />
    <presentationArc order="19" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_EDC6F01FB126268E6548FF4B57459DE7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtPolicyTextBlock" xlink:label="loc_us-gaap_DebtPolicyTextBlock_7A10C7C19D7EF8B19FFDFF4B574562B1" xlink:type="locator" />
    <presentationArc order="20" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_DebtPolicyTextBlock_7A10C7C19D7EF8B19FFDFF4B574562B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_887459995CB62ECB176FFF4B574549E6" xlink:type="locator" />
    <presentationArc order="21" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_C87CFEC866B1691CB5FAFF4B5745604F" xlink:to="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_887459995CB62ECB176FFF4B574549E6" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesStockBasedCompensationExpenseDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_F7FA1787E613FE07BE2F2BA72D0CD391" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_A8F0C4942EBF872890262BA72D0C8354" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_F7FA1787E613FE07BE2F2BA72D0CD391" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_A8F0C4942EBF872890262BA72D0C8354" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_8AA5C02163A5511704EC2BA72D0CF6AE" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_A8F0C4942EBF872890262BA72D0C8354" xlink:to="loc_us-gaap_AwardTypeAxis_8AA5C02163A5511704EC2BA72D0CF6AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9385C95AE4194DA830872BA72D0C2D36" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_8AA5C02163A5511704EC2BA72D0CF6AE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9385C95AE4194DA830872BA72D0C2D36" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PerformanceBasedRestrictedCommonStockMember" xlink:label="loc_csgp_PerformanceBasedRestrictedCommonStockMember_7A8BAE8ABC9CEF13D2382BA72D0C8675" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9385C95AE4194DA830872BA72D0C2D36" xlink:to="loc_csgp_PerformanceBasedRestrictedCommonStockMember_7A8BAE8ABC9CEF13D2382BA72D0C8675" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_E8FFEAAFB9F1868C1E7B2BA72D0C0808" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_A8F0C4942EBF872890262BA72D0C8354" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_E8FFEAAFB9F1868C1E7B2BA72D0C0808" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_11F511AA2E76201BAB032BA72D0C8AE3" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_E8FFEAAFB9F1868C1E7B2BA72D0C0808" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_11F511AA2E76201BAB032BA72D0C8AE3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_B2AD731E0CD3165E63C12BA72D0CA0C5" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_11F511AA2E76201BAB032BA72D0C8AE3" xlink:to="loc_us-gaap_CostOfSalesMember_B2AD731E0CD3165E63C12BA72D0CA0C5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_F0B090ED0535052EE3F62BA72D0CD68E" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_11F511AA2E76201BAB032BA72D0C8AE3" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_F0B090ED0535052EE3F62BA72D0CD68E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SoftwareDevelopmentMember" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_875AF532A52F2BF8F59D2BA72D0C7066" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_11F511AA2E76201BAB032BA72D0C8AE3" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_875AF532A52F2BF8F59D2BA72D0C7066" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_B110DE5AFECB41D744062BA72D0CABC0" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_11F511AA2E76201BAB032BA72D0C8AE3" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_B110DE5AFECB41D744062BA72D0CABC0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_612AD140BD436158A5282BA72D0C9F0E" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_A8F0C4942EBF872890262BA72D0C8354" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_612AD140BD436158A5282BA72D0C9F0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9583AFD904CD5CCC1FD92BA72D0C0646" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_612AD140BD436158A5282BA72D0C9F0E" xlink:to="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9583AFD904CD5CCC1FD92BA72D0C0646" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_1138662ADC3ACE0D42802BA72D0C45A7" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9583AFD904CD5CCC1FD92BA72D0C0646" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_1138662ADC3ACE0D42802BA72D0C45A7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_64D68BCC9FF8562E71062BA72D0C487D" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9583AFD904CD5CCC1FD92BA72D0C0646" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_64D68BCC9FF8562E71062BA72D0C487D" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_ProceedsFromExerciseOfStockOptionsAndEspp" xlink:label="loc_csgp_ProceedsFromExerciseOfStockOptionsAndEspp_F35F97C9D48E50D8B97D2BA72D0C2D5A" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9583AFD904CD5CCC1FD92BA72D0C0646" xlink:to="loc_csgp_ProceedsFromExerciseOfStockOptionsAndEspp_F35F97C9D48E50D8B97D2BA72D0C2D5A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxExpenseFromStockOptionsExercised" xlink:label="loc_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_802996C74E2C73DA8AC32BA72D0C95E3" xlink:type="locator" />
    <presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9583AFD904CD5CCC1FD92BA72D0C0646" xlink:to="loc_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_802996C74E2C73DA8AC32BA72D0C95E3" xlink:type="arc" />
  </presentationLink>
  <presentationLink xlink:role="http://www.costar.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_18C186D926BD1C79C08AFF4B56D86667" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_6EE6FAAD148A1BC7E8E7FF4B56D892BB" xlink:type="locator" />
    <presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_18C186D926BD1C79C08AFF4B56D86667" xlink:to="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_6EE6FAAD148A1BC7E8E7FF4B56D892BB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_56A47A75AEEAE91F8A3AFF4B56D879E9" xlink:type="locator" />
    <presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_18C186D926BD1C79C08AFF4B56D86667" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_56A47A75AEEAE91F8A3AFF4B56D879E9" xlink:type="arc" />
    <loc xlink:href="csgp-20131231.xsd#csgp_PropertyPlantAndEquipmentEstimatedUsefulLivesTableTextBlock" xlink:label="loc_csgp_PropertyPlantAndEquipmentEstimatedUsefulLivesTableTextBlock_D3BE6BDEDF0E0FBB26CCFF4B56D87136" xlink:type="locator" />
    <presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_18C186D926BD1C79C08AFF4B56D86667" xlink:to="loc_csgp_PropertyPlantAndEquipmentEstimatedUsefulLivesTableTextBlock_D3BE6BDEDF0E0FBB26CCFF4B56D87136" xlink:type="arc" />
  </presentationLink>
</linkbase>
