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  <element name="DebtInstrumentCovenantFixedChargeCoverageRatio" id="bxmt_DebtInstrumentCovenantFixedChargeCoverageRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentCovenantLiquidity" id="bxmt_DebtInstrumentCovenantLiquidity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentCovenantMinimumPercentageOfCashLiquidityOnRecourseIndebtedness" id="bxmt_DebtInstrumentCovenantMinimumPercentageOfCashLiquidityOnRecourseIndebtedness" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentCovenantMinimumPercentageOfTangibleNetWorthOnNetCashProceedOfEquityIssuances" id="bxmt_DebtInstrumentCovenantMinimumPercentageOfTangibleNetWorthOnNetCashProceedOfEquityIssuances" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentCovenantRequirementOnConsolidatedTangibleNetWorthMinimum" id="bxmt_DebtInstrumentCovenantRequirementOnConsolidatedTangibleNetWorthMinimum" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentEffectiveInterestRate" id="bxmt_DebtInstrumentEffectiveInterestRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentInterestRateStatedPercentageIncludingAmortizationCost" id="bxmt_DebtInstrumentInterestRateStatedPercentageIncludingAmortizationCost" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredFeesAndOtherItemsMember" id="bxmt_DeferredFeesAndOtherItemsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredIncomeAllocation" id="bxmt_DeferredIncomeAllocation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredStockUnits" id="bxmt_DeferredStockUnits" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DelinquentMember" id="bxmt_DelinquentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DirectStockPurchasePlanMember" id="bxmt_DirectStockPurchasePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendDeclaredNotPaid" id="bxmt_DividendDeclaredNotPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendPaidDate" id="bxmt_DividendPaidDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendReinvestmentAndDirectStockPurchasePlanMember" id="bxmt_DividendReinvestmentAndDirectStockPurchasePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendReinvestmentPlanMember" id="bxmt_DividendReinvestmentPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DocumentAndEntityInformationAbstract" id="bxmt_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentDividendsDistributions" id="bxmt_EquityMethodInvestmentDividendsDistributions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExciseTaxRate" id="bxmt_ExciseTaxRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpectedLossOnInvestment" id="bxmt_ExpectedLossOnInvestment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpenseReimbursementsPayableToManager" id="bxmt_ExpenseReimbursementsPayableToManager" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpensesOfConsolidatedSecuritizationVehicles" id="bxmt_ExpensesOfConsolidatedSecuritizationVehicles" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FaceAmountFairValueDisclosureMember" id="bxmt_FaceAmountFairValueDisclosureMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueInputRecoveryPercentage" id="bxmt_FairValueInputRecoveryPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNetOne" id="bxmt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNetOne" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetDeferredInterest" id="bxmt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDefinedBenefitPlanAssetDeferredInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringConsolidation" id="bxmt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringConsolidation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancingReceivablePrincipalAmountOfNonaccrualLoans" id="bxmt_FinancingReceivablePrincipalAmountOfNonaccrualLoans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignCustomersMember" id="bxmt_ForeignCustomersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GeneralAndAdministrativeExpensesSubtotal" id="bxmt_GeneralAndAdministrativeExpensesSubtotal" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoldmanSachsMember" id="bxmt_GoldmanSachsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GrantedIncentiveCompensationToEmployees" id="bxmt_GrantedIncentiveCompensationToEmployees" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GrossBookValueOfMortgageLoan" id="bxmt_GrossBookValueOfMortgageLoan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="HotelPropertyMember" id="bxmt_HotelPropertyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncentiveAwardsPlanMember" id="bxmt_IncentiveAwardsPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncentiveCompensation" id="bxmt_IncentiveCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncentiveCompensationOfFundsProfit" id="bxmt_IncentiveCompensationOfFundsProfit" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncentiveFeeComputationPercentOfOutstandingEquityPerAnnum" id="bxmt_IncentiveFeeComputationPercentOfOutstandingEquityPerAnnum" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncentiveFeeComputationPercentOfProductPerAgreement" id="bxmt_IncentiveFeeComputationPercentOfProductPerAgreement" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncentiveFeesPayable" id="bxmt_IncentiveFeesPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities" id="bxmt_IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InstallmentOneCurrentFiscalYearMember" id="bxmt_InstallmentOneCurrentFiscalYearMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InstallmentTwoCurrentFiscalYearMember" id="bxmt_InstallmentTwoCurrentFiscalYearMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InternationalMember" id="bxmt_InternationalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentMember" id="bxmt_InvestmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="JpMorganMember" id="bxmt_JpMorganMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LegacyPortfolioMember" id="bxmt_LegacyPortfolioMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LiborAverageFloorRate" id="bxmt_LiborAverageFloorRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoanLossReservesAsPercentageLoansReceivable" id="bxmt_LoanLossReservesAsPercentageLoansReceivable" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoanParticipationSoldPolicyTextBlock" id="bxmt_LoanParticipationSoldPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoanParticipationsSoldDisclosureTextBlock" id="bxmt_LoanParticipationsSoldDisclosureTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoansFundedDuringPeriod" id="bxmt_LoansFundedDuringPeriod" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoansHeldForSaleMember" id="bxmt_LoansHeldForSaleMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoansRepaymentsAndSales" id="bxmt_LoansRepaymentsAndSales" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MajorityOwnedSubsidiaryUnconsolidated2Member" id="bxmt_MajorityOwnedSubsidiaryUnconsolidated2Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ManagementFeesMember" id="bxmt_ManagementFeesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ManagementIncentiveAwardsPlan" id="bxmt_ManagementIncentiveAwardsPlan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ManagementIncentiveAwardsPlanPaidInCash" id="bxmt_ManagementIncentiveAwardsPlanPaidInCash" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumAdvanceRatePercentage" id="bxmt_MaximumAdvanceRatePercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MetlifeMember" id="bxmt_MetlifeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MezzanineAndJuniorMortgageCollateralMember" id="bxmt_MezzanineAndJuniorMortgageCollateralMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MinorityInterestTableTextBlock" id="bxmt_MinorityInterestTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MorganStanleyMember" id="bxmt_MorganStanleyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MultifamilyPropertyMember" id="bxmt_MultifamilyPropertyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetChangeInAccruedInterestReceivablePrepaidExpensesAndOtherAssets" id="bxmt_NetChangeInAccruedInterestReceivablePrepaidExpensesAndOtherAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetProceedsFromIssuanceOfCommonStock" id="bxmt_NetProceedsFromIssuanceOfCommonStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetTaxableIncomeSubjectToDistributionPercent" id="bxmt_NetTaxableIncomeSubjectToDistributionPercent" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonAccrualLoansMember" id="bxmt_NonAccrualLoansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NoncontrollingInterestIncreaseDecreaseFromBusinessCombination" id="bxmt_NoncontrollingInterestIncreaseDecreaseFromBusinessCombination" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfAssetSpecificRepurchaseAgreements" id="bxmt_NumberOfAssetSpecificRepurchaseAgreements" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfBenefitPlans" id="bxmt_NumberOfBenefitPlans" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfDaysPastDueAfterWhichAccrualOfInterestOnLoanDiscontinued" id="bxmt_NumberOfDaysPastDueAfterWhichAccrualOfInterestOnLoanDiscontinued" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfLoanParticipationsSold" id="bxmt_NumberOfLoanParticipationsSold" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfLoans" id="bxmt_NumberOfLoans" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfLoansMaturityDefault" id="bxmt_NumberOfLoansMaturityDefault" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfLoansReceivableOutstanding" id="bxmt_NumberOfLoansReceivableOutstanding" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfLoansUnderlying" id="bxmt_NumberOfLoansUnderlying" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfSubordinateInterestsInMortgagesOnNonaccrualStatus" id="bxmt_NumberOfSubordinateInterestsInMortgagesOnNonaccrualStatus" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OfficePropertyMember" id="bxmt_OfficePropertyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OneMonthLiborMember" id="bxmt_OneMonthLiborMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossesCarryforwardsExpirationDates" id="bxmt_OperatingLossesCarryforwardsExpirationDates" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OverallStatisticsForLoansReceivablesPortfolioTableTextBlock" id="bxmt_OverallStatisticsForLoansReceivablesPortfolioTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ParticipationsSoldFairValueDisclosure" id="bxmt_ParticipationsSoldFairValueDisclosure" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ParticipationsSoldLoanCouponRate" id="bxmt_ParticipationsSoldLoanCouponRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ParticipationsSoldLoanCouponRateDescription" id="bxmt_ParticipationsSoldLoanCouponRateDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ParticipationsSoldLoanYield" id="bxmt_ParticipationsSoldLoanYield" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ParticipationsSoldLoanYieldDescription" id="bxmt_ParticipationsSoldLoanYieldDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentForSettlementOfInterestRateSwap" id="bxmt_PaymentForSettlementOfInterestRateSwap" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfBookValue" id="bxmt_PercentageOfBookValue" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfDividendsPaidToCommonEquityHoldersCreatedEmployeePool" id="bxmt_PercentageOfDividendsPaidToCommonEquityHoldersCreatedEmployeePool" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfFullyVestedGrants" id="bxmt_PercentageOfFullyVestedGrants" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfGrantsVestingSchedule" id="bxmt_PercentageOfGrantsVestingSchedule" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfGrantsVestingUponReceiptOfDividends" id="bxmt_PercentageOfGrantsVestingUponReceiptOfDividends" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfIncentiveManagementFeePoolForEmployees" id="bxmt_PercentageOfIncentiveManagementFeePoolForEmployees" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfLoanLossReserves" id="bxmt_PercentageOfLoanLossReserves" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfLoansOpenToRepaymentByBorrower" id="bxmt_PercentageOfLoansOpenToRepaymentByBorrower" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfLoansReceivableByType" id="bxmt_PercentageOfLoansReceivableByType" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfLoansSubjectToYieldMaintenanceLockOutProvisionsOtherPrepaymentRestrictions" id="bxmt_PercentageOfLoansSubjectToYieldMaintenanceLockOutProvisionsOtherPrepaymentRestrictions" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfParticipationInterestInLoanSoldByCompany" id="bxmt_PercentageOfParticipationInterestInLoanSoldByCompany" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfRecourseDebt" id="bxmt_PercentageOfRecourseDebt" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfRemainingGrantsAfterVestingSchedule" id="bxmt_PercentageOfRemainingGrantsAfterVestingSchedule" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PlanAdoptionDate" id="bxmt_PlanAdoptionDate" type="us-types:dateStringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreferredReturn" id="bxmt_PreferredReturn" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalAmountMember" id="bxmt_PrincipalAmountMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalAmountOfCtLegacyPortfolioLoansRestructured" id="bxmt_PrincipalAmountOfCtLegacyPortfolioLoansRestructured" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProceedsFromLoanOriginationAndExitFees" id="bxmt_ProceedsFromLoanOriginationAndExitFees" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProceedsFromSaleOfLoanParticipation" id="bxmt_ProceedsFromSaleOfLoanParticipation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RatioOfIndebtednessToAssetValue" id="bxmt_RatioOfIndebtednessToAssetValue" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RealizedLossOnSaleOfLoansReceivable" id="bxmt_RealizedLossOnSaleOfLoansReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReclassificationToOtherAssets" id="bxmt_ReclassificationToOtherAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchaseFacilityBorrowingCapacity" id="bxmt_RepurchaseFacilityBorrowingCapacity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchaseFacilityMaximumBorrowingCapacity" id="bxmt_RepurchaseFacilityMaximumBorrowingCapacity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedCashFairValueDisclosure" id="bxmt_RestrictedCashFairValueDisclosure" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedCommonClassAMember" id="bxmt_RestrictedCommonClassAMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReturnOfCapitalToPartners" id="bxmt_ReturnOfCapitalToPartners" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReversalOfProvisionForLoanLeaseAndOtherLosses" id="bxmt_ReversalOfProvisionForLoanLeaseAndOtherLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevolvingRepurchaseFacilitiesMember" id="bxmt_RevolvingRepurchaseFacilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RiskRating1To3Member" id="bxmt_RiskRating1To3Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RiskRating6To8Member" id="bxmt_RiskRating6To8Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCashAndCashEquivalentsAndRestrictedCashAndCashEquivalentsTableTextBlock" id="bxmt_ScheduleOfCashAndCashEquivalentsAndRestrictedCashAndCashEquivalentsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfRangeOfKeyAssumptionsUsedForArrivingAtFairValueOfEachOfTheseTypesOfLoansTableTextBlock" id="bxmt_ScheduleOfRangeOfKeyAssumptionsUsedForArrivingAtFairValueOfEachOfTheseTypesOfLoansTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityLineItems" id="bxmt_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTable" id="bxmt_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SeniorMortgageCollateralMember" id="bxmt_SeniorMortgageCollateralMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SpecialServicingFees" id="bxmt_SpecialServicingFees" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockBasedNonCashCompensationExpensesAbstract" id="bxmt_StockBasedNonCashCompensationExpensesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIncentivePlanTwoThousandThirteenManagerPlanMember" id="bxmt_StockIncentivePlanTwoThousandThirteenManagerPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIncentivePlanTwoThousandThirteenMember" id="bxmt_StockIncentivePlanTwoThousandThirteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesIssuanceOfDeferredShares" id="bxmt_StockIssuedDuringPeriodSharesIssuanceOfDeferredShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodValueReverseStockSplit" id="bxmt_StockIssuedDuringPeriodValueReverseStockSplit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockSharesAuthorized" id="bxmt_StockSharesAuthorized" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SubordinatedLoansMember" id="bxmt_SubordinatedLoansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SubordinateMortgageLoanMember" id="bxmt_SubordinateMortgageLoanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThreeMonthLiborMember" id="bxmt_ThreeMonthLiborMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Tranche1Member" id="bxmt_Tranche1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TypesOfLoansInPortfolioTableTextBlock" id="bxmt_TypesOfLoansInPortfolioTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnderlyingLoansCouponRate" id="bxmt_UnderlyingLoansCouponRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnderlyingLoansCouponRateDescription" id="bxmt_UnderlyingLoansCouponRateDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnderlyingLoansPrincipalBalance" id="bxmt_UnderlyingLoansPrincipalBalance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnderlyingLoansYieldDescription" id="bxmt_UnderlyingLoansYieldDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnderlyingLoansYieldRate" id="bxmt_UnderlyingLoansYieldRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnfundedCommitmentsRelatedToLoansReceivable" id="bxmt_UnfundedCommitmentsRelatedToLoansReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedStatesMember" id="bxmt_UnitedStatesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedStatesMidwestMember" id="bxmt_UnitedStatesMidwestMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedStatesNortheastMember" id="bxmt_UnitedStatesNortheastMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedStatesNorthwestMember" id="bxmt_UnitedStatesNorthwestMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedStatesSoutheastMember" id="bxmt_UnitedStatesSoutheastMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedStatesSouthwestMember" id="bxmt_UnitedStatesSouthwestMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedStatesWestMember" id="bxmt_UnitedStatesWestMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPeriodTwoThousandFifteenMember" id="bxmt_VestingPeriodTwoThousandFifteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPeriodTwoThousandFourteenMember" id="bxmt_VestingPeriodTwoThousandFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPeriodTwoThousandSixteenMember" id="bxmt_VestingPeriodTwoThousandSixteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageAllInCostOfCreditMember" id="bxmt_WeightedAverageAllInCostOfCreditMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageCashCouponMember" id="bxmt_WeightedAverageCashCouponMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageCouponRate" id="bxmt_WeightedAverageCouponRate" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageMaturityTerm" id="bxmt_WeightedAverageMaturityTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageYieldRate" id="bxmt_WeightedAverageYieldRate" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WellsFargoMember" id="bxmt_WellsFargoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>


