<?xml version="1.0" encoding="US-ASCII"?>
<!-- RR Donnelley Xcelerate Taxonomy Schema, based on XBRL 2.1  http://www.rrdonnelley.com/ -->
<!-- Version: 6.22.4 -->
<!-- Round: 5 -->
<!-- Creation date: 2016-02-16T15:10:05Z -->
<!-- Copyright (c) 2005-2013 R.R. Donnelley & Sons Company All Rights Reserved. -->
<schema xmlns="http://www.w3.org/2001/XMLSchema"
  xmlns:xbrli="http://www.xbrl.org/2003/instance"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:us-gaap="http://fasb.org/us-gaap/2015-01-31"
  xmlns:us-types="http://fasb.org/us-types/2015-01-31"
  xmlns:bxmt="http://www.blackstonemortgagetrust.com/20151231"
  xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric"
  xmlns:num="http://www.xbrl.org/dtr/type/numeric"
  xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
  xmlns:country="http://xbrl.sec.gov/country/2013-01-31"
  xmlns:currency="http://xbrl.sec.gov/currency/2014-01-31"
  xmlns:dei="http://xbrl.sec.gov/dei/2014-01-31"
  xmlns:exch="http://xbrl.sec.gov/exch/2015-01-31"
  xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31"
  xmlns:naics="http://xbrl.sec.gov/naics/2011-01-31"
  xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31"
  xmlns:stpr="http://xbrl.sec.gov/stpr/2011-01-31"
  targetNamespace="http://www.blackstonemortgagetrust.com/20151231"
  elementFormDefault="qualified" attributeFormDefault="unqualified">
  <annotation>
    <appinfo>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DocumentandEntityInformation" id="DocumentandEntityInformation">
        <link:definition>101 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/StatementOfFinancialPositionUnclassified-DepositBasedOperations" id="Role_StatementOfFinancialPositionUnclassified-DepositBasedOperations">
        <link:definition>103 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/StatementOfFinancialPositionUnclassified-DepositBasedOperationsParenthetical" id="Role_StatementOfFinancialPositionUnclassified-DepositBasedOperationsParen">
        <link:definition>104 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/StatementOfIncomeInterestBasedRevenue" id="Role_StatementOfIncomeInterestBasedRevenue">
        <link:definition>105 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/StatementOfOtherComprehensiveIncome" id="Role_StatementOfOtherComprehensiveIncome">
        <link:definition>106 - Statement - Consolidated Statements of Comprehensive Income</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome" id="Role_StatementOfShareholdersEquityAndOtherComprehensiveIncome">
        <link:definition>107 - Statement - Consolidated Statements of Changes in Equity</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/StatementOfCashFlowsIndirect" id="Role_StatementOfCashFlowsIndirect">
        <link:definition>108 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsNatureOfOperations" id="Role_NotesToFinancialStatementsNatureOfOperations">
        <link:definition>109 - Disclosure - Organization</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsBasisOfPresentationAndSignificantAccountingPoliciesTextBlock" id="Role_NotesToFinancialStatementsBasisOfPresentationAndSignificantAccountingPoliciesTextBlock">
        <link:definition>110 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsFinancingReceivablesTextBlock" id="Role_NotesToFinancialStatementsFinancingReceivablesTextBlock">
        <link:definition>111 - Disclosure - Loans Receivable</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsEquityMethodInvestmentsDisclosureTextBlock" id="Role_NotesToFinancialStatementsEquityMethodInvestmentsDisclosureTextBlock">
        <link:definition>112 - Disclosure - Equity Investments in Unconsolidated Subsidiaries</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsOtherAssetsDisclosureTextBlock" id="Role_NotesToFinancialStatementsOtherAssetsDisclosureTextBlock">
        <link:definition>113 - Disclosure - Other Assets</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock" id="Role_NotesToFinancialStatementsDebtDisclosureTextBlock">
        <link:definition>114 - Disclosure - Secured Debt Agreements</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsLoanParticipationsSoldDisclosureTextBlock" id="Role_NotesToFinancialStatementsLoanParticipationsSoldDisclosureTextBlock">
        <link:definition>115 - Disclosure - Loan Participations Sold</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsConvertibleNotesTextBlock" id="Role_NotesToFinancialStatementsConvertibleNotesTextBlock">
        <link:definition>116 - Disclosure - Convertible Notes, Net</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" id="Role_NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock">
        <link:definition>117 - Disclosure - Derivative Financial Instruments</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock" id="Role_NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock">
        <link:definition>118 - Disclosure - Equity</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsOtherIncomeAndOtherExpenseDisclosureTextBlock" id="Role_NotesToFinancialStatementsOtherIncomeAndOtherExpenseDisclosureTextBlock">
        <link:definition>119 - Disclosure - Other Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock" id="Role_NotesToFinancialStatementsIncomeTaxDisclosureTextBlock">
        <link:definition>120 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" id="Role_NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock">
        <link:definition>121 - Disclosure - Stock-Based Incentive Plans</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock" id="Role_NotesToFinancialStatementsFairValueDisclosuresTextBlock">
        <link:definition>122 - Disclosure - Fair Values</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock" id="Role_NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock">
        <link:definition>123 - Disclosure - Transactions with Related Parties</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock" id="Role_NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock">
        <link:definition>124 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlock" id="Role_NotesToFinancialStatementsQuarterlyFinancialInformationTextBlock">
        <link:definition>125 - Disclosure - Summary of Quarterly Results of Operations</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsMortgageLoansOnRealEstateByLoanDisclosureTextBlock" id="Role_NotesToFinancialStatementsMortgageLoansOnRealEstateByLoanDisclosureTextBlock">
        <link:definition>126 - Disclosure - Schedule IV - Mortgage Loans on Real Estate</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsBasisOfPresentationAndSignificantAccountingPoliciesTextBlockPolicies" id="Role_NotesToFinancialStatementsBasisOfPresentationAndSignificantAccountingPoliciesTextBlockPolicies">
        <link:definition>127 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsFinancingReceivablesTextBlockTables" id="Role_NotesToFinancialStatementsFinancingReceivablesTextBlockTables">
        <link:definition>128 - Disclosure - Loans Receivable (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsEquityMethodInvestmentsDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsEquityMethodInvestmentsDisclosureTextBlockTables">
        <link:definition>129 - Disclosure - Equity Investments in Unconsolidated Subsidiaries (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsOtherAssetsDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsOtherAssetsDisclosureTextBlockTables">
        <link:definition>130 - Disclosure - Other Assets (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsDebtDisclosureTextBlockTables">
        <link:definition>131 - Disclosure - Secured Debt Agreements (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsLoanParticipationsSoldDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsLoanParticipationsSoldDisclosureTextBlockTables">
        <link:definition>132 - Disclosure - Loan Participations Sold (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlockTables">
        <link:definition>133 - Disclosure - Derivative Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlockTables">
        <link:definition>134 - Disclosure - Equity (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsOtherIncomeAndOtherExpenseDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsOtherIncomeAndOtherExpenseDisclosureTextBlockTables">
        <link:definition>135 - Disclosure - Other Expenses (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables" id="Role_NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables">
        <link:definition>136 - Disclosure - Stock-Based Incentive Plans (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables" id="Role_NotesToFinancialStatementsFairValueDisclosuresTextBlockTables">
        <link:definition>137 - Disclosure - Fair Values (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlockTables" id="Role_NotesToFinancialStatementsQuarterlyFinancialInformationTextBlockTables">
        <link:definition>138 - Disclosure - Summary of Quarterly Results of Operations (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation" id="DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation">
        <link:definition>139 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoansReceivableAdditionalInformation" id="DisclosureLoansReceivableAdditionalInformation">
        <link:definition>140 - Disclosure - Loans Receivable - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoansReceivableOverallStatisticsForLoansReceivablePortfolio" id="DisclosureLoansReceivableOverallStatisticsForLoansReceivablePortfolio">
        <link:definition>141 - Disclosure - Loans Receivable - Overall Statistics for Loans Receivable Portfolio (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoansReceivableOverallStatisticsForLoansReceivablePortfolioParenthetical" id="DisclosureLoansReceivableOverallStatisticsForLoansReceivablePortfolioParenthetical">
        <link:definition>142 - Disclosure - Loans Receivable - Overall Statistics for Loans Receivable Portfolio (Parenthetical) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoansReceivableActivityRelatingToLoansReceivablePortfolio" id="DisclosureLoansReceivableActivityRelatingToLoansReceivablePortfolio">
        <link:definition>143 - Disclosure - Loans Receivable - Activity Relating to Loans Receivable Portfolio (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoansReceivableTypesOfLoansInLoanPortfolioAsWellAsPropertyTypeAndGeographicDistributionOfPropertiesSecuringTheseLoans" id="DisclosureLoansReceivableTypesOfLoansInLoanPortfolioAsWellAsPropertyTypeAndGeographicDistributionOfPropertiesSecuringTheseLoans">
        <link:definition>144 - Disclosure - Loans Receivable - Types of Loans in Loan Portfolio, as well as Property Type and Geographic Distribution of Properties Securing these Loans (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoansReceivablePrincipalBalanceAndNetBookValueOfLoansReceivableBasedOnInternalRiskRatings" id="DisclosureLoansReceivablePrincipalBalanceAndNetBookValueOfLoansReceivableBasedOnInternalRiskRatings">
        <link:definition>145 - Disclosure - Loans Receivable - Principal Balance and Net Book Value of Loans Receivable Based on Internal Risk Ratings (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquityInvestmentsInUnconsolidatedSubsidiariesActivityRelatingToOurEquityInvestmentsInUnconsolidatedSubsidiaries" id="DisclosureEquityInvestmentsInUnconsolidatedSubsidiariesActivityRelatingToOurEquityInvestmentsInUnconsolidatedSubsidiaries">
        <link:definition>146 - Disclosure - Equity Investments in Unconsolidated Subsidiaries - Activity Relating to Our Equity Investments in Unconsolidated Subsidiaries (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquityInvestmentsInUnconsolidatedSubsidiariesAdditionalInformation" id="DisclosureEquityInvestmentsInUnconsolidatedSubsidiariesAdditionalInformation">
        <link:definition>147 - Disclosure - Equity Investments in Unconsolidated Subsidiaries - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureOtherAssetsSummaryOfComponentsOfOtherAssets" id="DisclosureOtherAssetsSummaryOfComponentsOfOtherAssets">
        <link:definition>148 - Disclosure - Other Assets - Summary of Components of Other Assets (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSecuredDebtAgreementsScheduleOfSecuredDebtAgreements" id="DisclosureSecuredDebtAgreementsScheduleOfSecuredDebtAgreements">
        <link:definition>149 - Disclosure - Secured Debt Agreements - Schedule of Secured Debt Agreements (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSecuredDebtAgreementsAdditionalInformation" id="DisclosureSecuredDebtAgreementsAdditionalInformation">
        <link:definition>150 - Disclosure - Secured Debt Agreements - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSecuredDebtAgreementsRevolvingRepurchaseFacilities" id="DisclosureSecuredDebtAgreementsRevolvingRepurchaseFacilities">
        <link:definition>151 - Disclosure - Secured Debt Agreements - Revolving Repurchase Facilities (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSecuredDebtAgreementsRevolvingRepurchaseFacilitiesParenthetical" id="DisclosureSecuredDebtAgreementsRevolvingRepurchaseFacilitiesParenthetical">
        <link:definition>152 - Disclosure - Secured Debt Agreements - Revolving Repurchase Facilities (Parenthetical) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSecuredDebtAgreementsSummaryOfKeyTermsOfRevolvingRepurchaseFacilities" id="DisclosureSecuredDebtAgreementsSummaryOfKeyTermsOfRevolvingRepurchaseFacilities">
        <link:definition>153 - Disclosure - Secured Debt Agreements - Summary of Key Terms of Revolving Repurchase Facilities (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSecuredDebtAgreementsSummaryOfKeyTermsOfRevolvingRepurchaseFacilitiesParenthetical" id="DisclosureSecuredDebtAgreementsSummaryOfKeyTermsOfRevolvingRepurchaseFacilitiesParenthetical">
        <link:definition>154 - Disclosure - Secured Debt Agreements - Summary of Key Terms of Revolving Repurchase Facilities (Parenthetical) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSecuredDebtAgreementsSummaryOfStatisticsForAssetSpecificRepurchaseAgreements" id="DisclosureSecuredDebtAgreementsSummaryOfStatisticsForAssetSpecificRepurchaseAgreements">
        <link:definition>155 - Disclosure - Secured Debt Agreements - Summary of Statistics for Asset-Specific Repurchase Agreements (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoanParticipationsSoldAdditionalInformation" id="DisclosureLoanParticipationsSoldAdditionalInformation">
        <link:definition>156 - Disclosure - Loan Participations Sold - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoanParticipationsSoldSummaryOfStatisticsForLoanParticipationsSold" id="DisclosureLoanParticipationsSoldSummaryOfStatisticsForLoanParticipationsSold">
        <link:definition>157 - Disclosure - Loan Participations Sold - Summary of Statistics for Loan Participations Sold (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureLoanParticipationsSoldSummaryOfStatisticsForLoanParticipationsSoldParenthetical" id="DisclosureLoanParticipationsSoldSummaryOfStatisticsForLoanParticipationsSoldParenthetical">
        <link:definition>158 - Disclosure - Loan Participations Sold - Summary of Statistics for Loan Participations Sold (Parenthetical) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureConvertibleNotesNetAdditionalInformation" id="DisclosureConvertibleNotesNetAdditionalInformation">
        <link:definition>159 - Disclosure - Convertible Notes, Net - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfOutstandingForeignExchangeDerivativesDesignatedAsNetInvestmentHedgesOfForeignCurrencyRisk" id="DisclosureDerivativeFinancialInstrumentsSummaryOfOutstandingForeignExchangeDerivativesDesignatedAsNetInvestmentHedgesOfForeignCurrencyRisk">
        <link:definition>160 - Disclosure - Derivative Financial Instruments - Summary of Outstanding Foreign Exchange Derivatives Designated as Net Investment Hedges of Foreign Currency Risk (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformation" id="DisclosureDerivativeFinancialInstrumentsAdditionalInformation">
        <link:definition>161 - Disclosure - Derivative Financial Instruments - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfOutstandingInterestRateDerivativesDesignatedAsCashFlowHedgesOfInterestRateRisk" id="DisclosureDerivativeFinancialInstrumentsSummaryOfOutstandingInterestRateDerivativesDesignatedAsCashFlowHedgesOfInterestRateRisk">
        <link:definition>162 - Disclosure - Derivative Financial Instruments - Summary of Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfOutstandingNondesignatedHedges" id="DisclosureDerivativeFinancialInstrumentsSummaryOfOutstandingNondesignatedHedges">
        <link:definition>163 - Disclosure - Derivative Financial Instruments - Summary of Outstanding Non-designated Hedges (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfFairValueOfDerivativeFinancialInstruments" id="DisclosureDerivativeFinancialInstrumentsSummaryOfFairValueOfDerivativeFinancialInstruments">
        <link:definition>164 - Disclosure - Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfEffectOfDerivativeFinancialInstrumentsOnConsolidatedStatementsOfOperations" id="DisclosureDerivativeFinancialInstrumentsSummaryOfEffectOfDerivativeFinancialInstrumentsOnConsolidatedStatementsOfOperations">
        <link:definition>165 - Disclosure - Derivative Financial Instruments - Summary of Effect of Derivative Financial Instruments on Consolidated Statements of Operations (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfEffectOfDerivativeFinancialInstrumentsOnConsolidatedStatementsOfOperationsParenthetical" id="DisclosureDerivativeFinancialInstrumentsSummaryOfEffectOfDerivativeFinancialInstrumentsOnConsolidatedStatementsOfOperationsParenthetical">
        <link:definition>166 - Disclosure - Derivative Financial Instruments - Summary of Effect of Derivative Financial Instruments on Consolidated Statements of Operations (Parenthetical) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquityAdditionalInformation" id="DisclosureEquityAdditionalInformation">
        <link:definition>167 - Disclosure - Equity - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquitySummaryOfClassACommonStockIssuances" id="DisclosureEquitySummaryOfClassACommonStockIssuances">
        <link:definition>168 - Disclosure - Equity - Summary of Class A Common Stock Issuances (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquitySummaryOfClassACommonStockIssuancesParenthetical" id="DisclosureEquitySummaryOfClassACommonStockIssuancesParenthetical">
        <link:definition>169 - Disclosure - Equity - Summary of Class A Common Stock Issuances (Parenthetical) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquityScheduleOfMovementInOutstandingSharesOfClassACommonStockRestrictedClassACommonStockAndDeferredStockUnits" id="DisclosureEquityScheduleOfMovementInOutstandingSharesOfClassACommonStockRestrictedClassACommonStockAndDeferredStockUnits">
        <link:definition>170 - Disclosure - Equity - Schedule of Movement in Outstanding Shares of Class A Common Stock, Restricted Class A Common Stock and Deferred Stock Units (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquityScheduleOfMovementInOutstandingSharesOfClassACommonStockRestrictedClassACommonStockAndDeferredStockUnitsParenthetical" id="DisclosureEquityScheduleOfMovementInOutstandingSharesOfClassACommonStockRestrictedClassACommonStockAndDeferredStockUnitsParenthetical">
        <link:definition>171 - Disclosure - Equity - Schedule of Movement in Outstanding Shares of Class A Common Stock, Restricted Class A Common Stock and Deferred Stock Units (Parenthetical) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquityScheduleOfDividendActivity" id="DisclosureEquityScheduleOfDividendActivity">
        <link:definition>172 - Disclosure - Equity - Schedule of Dividend Activity (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureEquityScheduleOfBasicAndDilutedEarningsPerShareOrEPSBasedOnWeightedAverageOfBothRestrictedAndUnrestrictedClassACommonStockOutstanding" id="DisclosureEquityScheduleOfBasicAndDilutedEarningsPerShareOrEPSBasedOnWeightedAverageOfBothRestrictedAndUnrestrictedClassACommonStockOutstanding">
        <link:definition>173 - Disclosure - Equity - Schedule of Basic and Diluted Earnings Per Share, or EPS, Based on Weighted-Average of Both Restricted and Unrestricted Class A Common Stock Outstanding (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureOtherExpensesAdditionalInformation" id="DisclosureOtherExpensesAdditionalInformation">
        <link:definition>174 - Disclosure - Other Expenses - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureOtherExpensesScheduleOfGeneralAndAdministrativeExpenses" id="DisclosureOtherExpensesScheduleOfGeneralAndAdministrativeExpenses">
        <link:definition>175 - Disclosure - Other Expenses - Schedule of General and Administrative Expenses (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureIncomeTaxesAdditionalInformation" id="DisclosureIncomeTaxesAdditionalInformation">
        <link:definition>176 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureStockBasedIncentivePlansAdditionalInformation" id="DisclosureStockBasedIncentivePlansAdditionalInformation">
        <link:definition>177 - Disclosure - Stock-Based Incentive Plans - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureStockBasedIncentivePlansMovementInOutstandingSharesOfRestrictedClassACommonStockAndWeightedAverageGrantDateFairValuePerShare" id="DisclosureStockBasedIncentivePlansMovementInOutstandingSharesOfRestrictedClassACommonStockAndWeightedAverageGrantDateFairValuePerShare">
        <link:definition>178 - Disclosure - Stock-Based Incentive Plans - Movement in Outstanding Shares of Restricted Class A Common Stock and Weighted-Average Grant Date Fair Value Per Share (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureFairValuesAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis" id="DisclosureFairValuesAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis">
        <link:definition>179 - Disclosure - Fair Values - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureFairValuesReconciliationOfBeginningAndEndingBalancesOfAssetsMeasuredAtFairValueOnRecurringBasisUsingLevel3Inputs" id="DisclosureFairValuesReconciliationOfBeginningAndEndingBalancesOfAssetsMeasuredAtFairValueOnRecurringBasisUsingLevel3Inputs">
        <link:definition>180 - Disclosure - Fair Values - Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on Recurring Basis Using Level 3 Inputs (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureFairValuesAdditionalInformation" id="DisclosureFairValuesAdditionalInformation">
        <link:definition>181 - Disclosure - Fair Values - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureFairValuesScheduleOfDetailsOfCarryingAmountFaceAmountAndFairValueOfFinancialInstruments" id="DisclosureFairValuesScheduleOfDetailsOfCarryingAmountFaceAmountAndFairValueOfFinancialInstruments">
        <link:definition>182 - Disclosure - Fair Values - Schedule of Details of Carrying Amount, Face Amount, and Fair Value of Financial Instruments (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureTransactionsWithRelatedPartiesAdditionalInformation" id="DisclosureTransactionsWithRelatedPartiesAdditionalInformation">
        <link:definition>183 - Disclosure - Transactions with Related Parties - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformation" id="DisclosureCommitmentsAndContingenciesAdditionalInformation">
        <link:definition>184 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureSummaryOfQuarterlyResultsOfOperationsSummaryOfQuarterlyResultsOfOperations" id="DisclosureSummaryOfQuarterlyResultsOfOperationsSummaryOfQuarterlyResultsOfOperations">
        <link:definition>185 - Disclosure - Summary of Quarterly Results of Operations - Summary of Quarterly Results of Operations (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureScheduleIVMortgageLoansOnRealEstate" id="DisclosureScheduleIVMortgageLoansOnRealEstate">
        <link:definition>186 - Disclosure - Schedule IV - Mortgage Loans on Real Estate (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureScheduleIVMortgageLoansOnRealEstateParenthetical" id="DisclosureScheduleIVMortgageLoansOnRealEstateParenthetical">
        <link:definition>187 - Disclosure - Schedule IV - Mortgage Loans on Real Estate (Parenthetical) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.blackstonemortgagetrust.com/taxonomy/role/DisclosureScheduleIVReconciliationOfMortgageLoansOnRealEstate" id="DisclosureScheduleIVReconciliationOfMortgageLoansOnRealEstate">
        <link:definition>188 - Disclosure - Schedule IV - Reconciliation of Mortgage Loans on Real Estate (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:href="bxmt-20151231_cal.xml" xlink:title="Calculation Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:href="bxmt-20151231_def.xml" xlink:title="Definition Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:href="bxmt-20151231_lab.xml" xlink:title="Label Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:href="bxmt-20151231_pre.xml" xlink:title="Presentation Links, all"/>
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <import namespace="http://fasb.org/us-types/2015-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2015/elts/us-types-2015-01-31.xsd"/>
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <import namespace="http://fasb.org/us-gaap/2015-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/country/2013-01-31" schemaLocation="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/currency/2014-01-31" schemaLocation="http://xbrl.sec.gov/currency/2014/currency-2014-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/exch/2015-01-31" schemaLocation="http://xbrl.sec.gov/exch/2015/exch-2015-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/naics/2011-01-31" schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd"/>
  <element name="AccruedIncentiveFeesPayable" id="bxmt_AccruedIncentiveFeesPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AccruedManagementAndIncentiveFeesPayable" id="bxmt_AccruedManagementAndIncentiveFeesPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AccruedManagementFeesPayable" id="bxmt_AccruedManagementFeesPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AccruedSpecialServicingFeePayable" id="bxmt_AccruedSpecialServicingFeePayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ActivityInLoansReceivableTableTextBlock" id="bxmt_ActivityInLoansReceivableTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdditionsDuringPeriodAbstract" id="bxmt_AdditionsDuringPeriodAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdjustmentsToAdditionalPaidInCapitalDeferredCompensation" id="bxmt_AdjustmentsToAdditionalPaidInCapitalDeferredCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdjustmentToParValueForReverseStockSplit" id="bxmt_AdjustmentToParValueForReverseStockSplit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AffiliatedEntity2Member" id="bxmt_AffiliatedEntity2Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AggregateSalesPriceOfCommonStock" id="bxmt_AggregateSalesPriceOfCommonStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AggregateSalesPriceOfCommonStockRemainingAvailable" id="bxmt_AggregateSalesPriceOfCommonStockRemainingAvailable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AgreementInitiationDate" id="bxmt_AgreementInitiationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AmortizationOfDebtDiscountAndDebtIssuanceCosts" id="bxmt_AmortizationOfDebtDiscountAndDebtIssuanceCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AmortizationOfDeferredFeesAndOtherItemsOnLoans" id="bxmt_AmortizationOfDeferredFeesAndOtherItemsOnLoans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AmortizationOfDeferredFinancingCostsAndOtherItemsOnDebtObligations" id="bxmt_AmortizationOfDeferredFinancingCostsAndOtherItemsOnDebtObligations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AmountOfGuaranteeObligations" id="bxmt_AmountOfGuaranteeObligations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AnnualDistributionOfNetTaxableIncomePercentage" id="bxmt_AnnualDistributionOfNetTaxableIncomePercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AnnualLimitationNetOperatingLossesAndNetCapitalLosses" id="bxmt_AnnualLimitationNetOperatingLossesAndNetCapitalLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="April2015StockOfferingMember" id="bxmt_April2015StockOfferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssetSpecificBorrowingsMember" id="bxmt_AssetSpecificBorrowingsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssetSpecificRepurchaseAgreementsMember" id="bxmt_AssetSpecificRepurchaseAgreementsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssetSpecificRepurchaseAgreementsNumberOfLoans" id="bxmt_AssetSpecificRepurchaseAgreementsNumberOfLoans" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssetSpecificRevolvingRepurchaseFacilitiesMember" id="bxmt_AssetSpecificRevolvingRepurchaseFacilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AtTheMarketAgreementMember" id="bxmt_AtTheMarketAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AuditDirectorMember" id="bxmt_AuditDirectorMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BankOfAmericaMember" id="bxmt_BankOfAmericaMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BoardOfDirectorsMember" id="bxmt_BoardOfDirectorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BookValueCollateralOfGrossLoanForAssetSpecificRepurchaseAgreements" id="bxmt_BookValueCollateralOfGrossLoanForAssetSpecificRepurchaseAgreements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BookValueNetMember" id="bxmt_BookValueNetMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowerAMember" id="bxmt_BorrowerAMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowerBMember" id="bxmt_BorrowerBMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowerCMember" id="bxmt_BorrowerCMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowerDMember" id="bxmt_BorrowerDMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowerEMember" id="bxmt_BorrowerEMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BxmtAdvisorsLimitedLiabilityCompanyAndAffiliatesMember" id="bxmt_BxmtAdvisorsLimitedLiabilityCompanyAndAffiliatesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BXMTAdvisorsLimitedLiabilityCompanyMember" id="bxmt_BXMTAdvisorsLimitedLiabilityCompanyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CarryingValueOfPortfolioLoansRestructured" id="bxmt_CarryingValueOfPortfolioLoansRestructured" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CdorMember" id="bxmt_CdorMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CitibankMember" id="bxmt_CitibankMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ClosingOfAssetSpecificRepurchaseFacilities" id="bxmt_ClosingOfAssetSpecificRepurchaseFacilities" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ClosingOfRevolvingRepurchaseFacility" id="bxmt_ClosingOfRevolvingRepurchaseFacility" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CollateralAssetsMember" id="bxmt_CollateralAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommitmentsAndContingenciesLineItems" id="bxmt_CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommitmentsAndContingenciesTable" id="bxmt_CommitmentsAndContingenciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="CommitmentsExpirationPeriod" id="bxmt_CommitmentsExpirationPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommonStockSharesOutstandingIncludingStockEquivalents" id="bxmt_CommonStockSharesOutstandingIncludingStockEquivalents" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommonStockSharesOutstandingPercentage" id="bxmt_CommonStockSharesOutstandingPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ComputedManagementFeePercentOfAverageOutstandingEquityBalance" id="bxmt_ComputedManagementFeePercentOfAverageOutstandingEquityBalance" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CondoMember" id="bxmt_CondoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CondominiumPropertyMember" id="bxmt_CondominiumPropertyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ConvertibleNotesPolicyTextBlock" id="bxmt_ConvertibleNotesPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ConvertibleNotesTextBlock" id="bxmt_ConvertibleNotesTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CoreGeneralAndAdministrativeExpenses" id="bxmt_CoreGeneralAndAdministrativeExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CtCdoIMember" id="bxmt_CtCdoIMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CTInvestmentManagementCoLLCMember" id="bxmt_CTInvestmentManagementCoLLCMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CtLegacyPartnersMember" id="bxmt_CtLegacyPartnersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CTOPIMember" id="bxmt_CTOPIMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentAssetSpecificBorrowingsAdvanceRate" id="bxmt_DebtInstrumentAssetSpecificBorrowingsAdvanceRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentCovenantFixedChargeCoverageRatio1" id="bxmt_DebtInstrumentCovenantFixedChargeCoverageRatio1" type="num:percentItemType" 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="DebtInstrumentNumberOfExtensionOptions" id="bxmt_DebtInstrumentNumberOfExtensionOptions" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentRevolvingRepurchaseFacilitiesAdvanceRate" id="bxmt_DebtInstrumentRevolvingRepurchaseFacilitiesAdvanceRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentRevolvingRepurchaseFacilitiesGuaranteeRate" id="bxmt_DebtInstrumentRevolvingRepurchaseFacilitiesGuaranteeRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentRevolvingRepurchaseFacilitiesMarginCallDescription" id="bxmt_DebtInstrumentRevolvingRepurchaseFacilitiesMarginCallDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeductionsDuringPeriodAbstract" id="bxmt_DeductionsDuringPeriodAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" 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="DeferredFeesAndOtherItemsOnLoanPrincipalBalance" id="bxmt_DeferredFeesAndOtherItemsOnLoanPrincipalBalance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" 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="DeferredOriginationFeesAndExpenses" id="bxmt_DeferredOriginationFeesAndExpenses" 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="DerivativeContractInterestRateSwapTerminationPeriod" id="bxmt_DerivativeContractInterestRateSwapTerminationPeriod" type="xbrli:gYearMonthItemType" 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="DocumentAndEntityInformationAbstract" id="bxmt_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EuriborMember" id="bxmt_EuriborMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" 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="ExpiredPlansMember" id="bxmt_ExpiredPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" 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="FacilityFourMember" id="bxmt_FacilityFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FacilityOneMember" id="bxmt_FacilityOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FacilityThreeMember" id="bxmt_FacilityThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FacilityTwoMember" id="bxmt_FacilityTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FixedRateLoansReceivableMember" id="bxmt_FixedRateLoansReceivableMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FloatingRateLoans" id="bxmt_FloatingRateLoans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FloatingRateLoansReceivableMember" id="bxmt_FloatingRateLoansReceivableMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignExchangeContractBuyCanadianDollarSellUnitedStatesDollarMember" id="bxmt_ForeignExchangeContractBuyCanadianDollarSellUnitedStatesDollarMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignExchangeContractBuyGreatBritainPoundSellEuroMember" id="bxmt_ForeignExchangeContractBuyGreatBritainPoundSellEuroMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignExchangeContractBuyGreatBritainPoundSellUnitedStatesDollarMember" id="bxmt_ForeignExchangeContractBuyGreatBritainPoundSellUnitedStatesDollarMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignExchangeContractBuyUnitedStatesDollarSellCanadianDollarMember" id="bxmt_ForeignExchangeContractBuyUnitedStatesDollarSellCanadianDollarMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignExchangeContractBuyUnitedStatesDollarSellGreatBritainPoundMember" id="bxmt_ForeignExchangeContractBuyUnitedStatesDollarSellGreatBritainPoundMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainOnTerminationOfInterestRateSwap" id="bxmt_GainOnTerminationOfInterestRateSwap" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GbpLiborMember" id="bxmt_GbpLiborMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GeneralElectricalCapitalCorporationMember" id="bxmt_GeneralElectricalCapitalCorporationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GePortfolioAcquisitionFacilityMember" id="bxmt_GePortfolioAcquisitionFacilityMember" 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="IncentiveFeeComputationPercentOfAverageOutstandingEquityPerAnnum" id="bxmt_IncentiveFeeComputationPercentOfAverageOutstandingEquityPerAnnum" 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="IndependentMembersOfBoardOfDirectorsMember" id="bxmt_IndependentMembersOfBoardOfDirectorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="JointVentureAgreementExpirationDate" id="bxmt_JointVentureAgreementExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="JointVentureOwnershipPercentage" id="bxmt_JointVentureOwnershipPercentage" type="num:percentItemType" abstract="false" 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="LiborAverageFloorRate" id="bxmt_LiborAverageFloorRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoanModificationFee" id="bxmt_LoanModificationFee" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoanParticipationSold" id="bxmt_LoanParticipationSold" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" 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="LoanPrincipalPaymentsHeldByServicer" id="bxmt_LoanPrincipalPaymentsHeldByServicer" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoansAndLeasesReceivableNetReportedDefaultAmount" id="bxmt_LoansAndLeasesReceivableNetReportedDefaultAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" 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="LoansOriginatedAcquiredAndFundedDuringPeriod" id="bxmt_LoansOriginatedAcquiredAndFundedDuringPeriod" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoansOriginatedAndAcquiredDuringPeriod" id="bxmt_LoansOriginatedAndAcquiredDuringPeriod" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoansOutstandingWithUnfundedCommitments" id="bxmt_LoansOutstandingWithUnfundedCommitments" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LoansRepayments" id="bxmt_LoansRepayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ManagementAgreementInitialTermExpiryDate" id="bxmt_ManagementAgreementInitialTermExpiryDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ManagementAgreementRenewalPeriod" id="bxmt_ManagementAgreementRenewalPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ManagementAgreementRenewalTermDescription" id="bxmt_ManagementAgreementRenewalTermDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ManufacturedHousingCommunitiesMember" id="bxmt_ManufacturedHousingCommunitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ManufacturedHousingMember" id="bxmt_ManufacturedHousingMember" type="nonnum:domainItemType" abstract="true" 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="MorganStanleyMember" id="bxmt_MorganStanleyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MortgageLoansOnRealEstateFinalMaturityYear" id="bxmt_MortgageLoansOnRealEstateFinalMaturityYear" type="xbrli:gYearItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetIncomeLossPerShareOfCommonStockAbstract" id="bxmt_NetIncomeLossPerShareOfCommonStockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" 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="NonCashAndLegacyCompensationExpenses" id="bxmt_NonCashAndLegacyCompensationExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCashCompensationExpenseStockIncentivePlanManagement" id="bxmt_NonCashCompensationExpenseStockIncentivePlanManagement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NoncontrollingInterestChargesFromPurchaseOfEquityInterestAtFairValue" id="bxmt_NoncontrollingInterestChargesFromPurchaseOfEquityInterestAtFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" 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="NumberOfBenefitPlans" id="bxmt_NumberOfBenefitPlans" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfDirectors" id="bxmt_NumberOfDirectors" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfDirectorsEligibleForAnnualCompensation" id="bxmt_NumberOfDirectorsEligibleForAnnualCompensation" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfEqualQuarterlyInstallments" id="bxmt_NumberOfEqualQuarterlyInstallments" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfInterestRateSwapAgreementsTerminated" id="bxmt_NumberOfInterestRateSwapAgreementsTerminated" type="xbrli:integerItemType" 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="NumberOfLoansUnderlying" id="bxmt_NumberOfLoansUnderlying" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfSeniorLoanParticipationsSold" id="bxmt_NumberOfSeniorLoanParticipationsSold" type="xbrli:integerItemType" 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="ParticipatingMortgageLoansParticipationLiabilitiesPrincipalAmount" id="bxmt_ParticipatingMortgageLoansParticipationLiabilitiesPrincipalAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" 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="PaymentsForSpecialCommitteeServices" id="bxmt_PaymentsForSpecialCommitteeServices" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfAdditionalBorrowingCapacity" id="bxmt_PercentageOfAdditionalBorrowingCapacity" type="num:percentItemType" abstract="false" xbrli:periodType="instant" 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="PercentageOfCompensationFormOfDeferredStockUnits" id="bxmt_PercentageOfCompensationFormOfDeferredStockUnits" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCompensationPaidInCash" id="bxmt_PercentageOfCompensationPaidInCash" type="num:percentItemType" abstract="false" xbrli:periodType="duration" 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="PercentageOfIncentiveManagementFeePoolForEmployees" id="bxmt_PercentageOfIncentiveManagementFeePoolForEmployees" 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="PercentageOfPoolFullyVested" id="bxmt_PercentageOfPoolFullyVested" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPoolTwoThirdsVested" id="bxmt_PercentageOfPoolTwoThirdsVested" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPoolVested" id="bxmt_PercentageOfPoolVested" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPoolVestingUponReceiptOfDividends" id="bxmt_PercentageOfPoolVestingUponReceiptOfDividends" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPortfolioFloatingRateLoans" id="bxmt_PercentageOfPortfolioFloatingRateLoans" type="num:percentItemType" abstract="false" xbrli:periodType="instant" 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="PercentageOfTaxableAsCapitalGainDividends" id="bxmt_PercentageOfTaxableAsCapitalGainDividends" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfTaxableAsOrdinaryDividend" id="bxmt_PercentageOfTaxableAsOrdinaryDividend" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfTaxableDividend" id="bxmt_PercentageOfTaxableDividend" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PlanAdoptionDate" id="bxmt_PlanAdoptionDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PledgedAssetsRepaymentRevolvingRepurchaseFacilitiesMember" id="bxmt_PledgedAssetsRepaymentRevolvingRepurchaseFacilitiesMember" type="nonnum:domainItemType" abstract="true" 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="PrimaryMember" id="bxmt_PrimaryMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalAmountOfPortfolioLoansRestructured" id="bxmt_PrincipalAmountOfPortfolioLoansRestructured" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalAndInterestPaymentsHeldByOurThirdPartyLoanServicer" id="bxmt_PrincipalAndInterestPaymentsHeldByOurThirdPartyLoanServicer" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalCollateralOfGrossLoanForAssetSpecificRepurchaseAgreements" id="bxmt_PrincipalCollateralOfGrossLoanForAssetSpecificRepurchaseAgreements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" 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="PurchasePriceOfLoanPortfolio" id="bxmt_PurchasePriceOfLoanPortfolio" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" 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="RealEstateDebtAndEquityInvestmentsAtFairValue" id="bxmt_RealEstateDebtAndEquityInvestmentsAtFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" 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="ReclassifiedFromOtherComprehensiveIncomeAsIncreaseToInterestExpenseInNextTwelveMonth" id="bxmt_ReclassifiedFromOtherComprehensiveIncomeAsIncreaseToInterestExpenseInNextTwelveMonth" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" 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="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="RiskRatingFourMember" id="bxmt_RiskRatingFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RiskRatingOneMember" id="bxmt_RiskRatingOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RiskRatingThreeMember" id="bxmt_RiskRatingThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RiskRatingTwoMember" id="bxmt_RiskRatingTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SecuredDebtRepurchaseAgreementsFaceAmount" id="bxmt_SecuredDebtRepurchaseAgreementsFaceAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SecuredDebtRepurchaseAgreementsGross" id="bxmt_SecuredDebtRepurchaseAgreementsGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorMortgageLoansInExcessOfThreePercentageOfCarryingAmountOfLoansMember" id="bxmt_SeniorMortgageLoansInExcessOfThreePercentageOfCarryingAmountOfLoansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorMortgageLoansLessThanThreePercentageOfCarryingAmountOfLoansMember" id="bxmt_SeniorMortgageLoansLessThanThreePercentageOfCarryingAmountOfLoansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SequentialRepayAdvanceMember" id="bxmt_SequentialRepayAdvanceMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SequentialRepayAdvancePercentageOfRecourseDebt" id="bxmt_SequentialRepayAdvancePercentageOfRecourseDebt" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ServicingFeesPayable" id="bxmt_ServicingFeesPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeventyFivePercentageOfPoolVested" id="bxmt_SeventyFivePercentageOfPoolVested" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SocieteGeneraleMember" id="bxmt_SocieteGeneraleMember" 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="StockIncentiveCurrentPlanMember" id="bxmt_StockIncentiveCurrentPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesPricePerShare" id="bxmt_StockIssuedDuringPeriodSharesPricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" 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="TaxBasisOfMortgageLoans" id="bxmt_TaxBasisOfMortgageLoans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThirdPartyServicesMember" id="bxmt_ThirdPartyServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThreeMembersOfBoardOfDirectorsMember" id="bxmt_ThreeMembersOfBoardOfDirectorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TransactionCostExpensed" id="bxmt_TransactionCostExpensed" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" 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="UnderlyingLoansBookValue" id="bxmt_UnderlyingLoansBookValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" 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="UnderwritingCommissionsAndOfferingCostsPolicyTextBlock" id="bxmt_UnderwritingCommissionsAndOfferingCostsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" 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="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="UnrealizedForeignCurrencyGainOnMortgageLoans" id="bxmt_UnrealizedForeignCurrencyGainOnMortgageLoans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnrealizedForeignCurrencyLossOnMortgageLoans" id="bxmt_UnrealizedForeignCurrencyLossOnMortgageLoans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UsdLiborMember" id="bxmt_UsdLiborMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VariousMember" id="bxmt_VariousMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPeriodTwoThousandEighteenMember" id="bxmt_VestingPeriodTwoThousandEighteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPeriodTwoThousandSeventeenMember" id="bxmt_VestingPeriodTwoThousandSeventeenMember" 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="WeightedAverageCashCouponRate" id="bxmt_WeightedAverageCashCouponRate" type="num:percentItemType" abstract="false" 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="WeightedAverageYieldCostRate" id="bxmt_WeightedAverageYieldCostRate" type="num:percentItemType" 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"/>
  <element name="YearFiveMember" id="bxmt_YearFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="YearFourMember" id="bxmt_YearFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>


