Document:

EX-10.4

 Exhibit 10.4 

Execution Version 

THIRD AMENDMENT TO FOURTH AMENDED AND RESTATED MASTER 

REPURCHASE AGREEMENT 

THIS THIRD AMENDMENT TO FOURTH AMENDED AND RESTATED MASTER REPURCHASE AGREEMENT (this “Amendment”), dated as of
February 19, 2020 (the “Effective Date”), is made by and among PARLEX 2 FINANCE, LLC, a Delaware limited liability company (“Parlex 2”), PARLEX 2A FINCO, LLC, a Delaware limited liability company
(“Parlex 2A”), PARLEX 2 UK FINCO, LLC, a Delaware limited liability company (“Parlex 2 UK”), PARLEX 2 EUR FINCO, LLC, a Delaware limited liability company (“Parlex 2 EUR”), PARLEX 2 AU FINCO, LLC, a
Delaware limited liability company (“Parlex 2 AU”), PARLEX 2 CAD FINCO, LLC, a Delaware limited liability company (“Parlex 2 CAD”, and together with Parlex 2, Parlex 2A, Parlex 2 UK, Parlex 2 EUR, Parlex 2 AU and
any other Person when such Person joins as a Seller hereunder from time to time, individually and/or collectively as the context may require, “Seller”), BLACKSTONE MORTGAGE TRUST, INC., a Maryland corporation
(“Guarantor”) (for the purpose of acknowledging and agreeing to the provision set forth in Section 3 hereof), and CITIBANK, N.A., a national banking association (“Buyer”). 

W I T N E S S E T H: 

WHEREAS, Seller and Buyer have entered into that certain Fourth Amended and Restated Master Repurchase Agreement, dated
as of February 15, 2019, as amended by that certain First Amendment to Fourth Amended and Restated Master Repurchase Agreement, dated as of June 7, 2019, by and among Seller, Guarantor and Buyer, and as further amended by that certain
Second Amendment to Fourth Amended and Restated Master Repurchase Agreement, dated as of July 16, 2019, by and among Seller, Guarantor and Buyer (as the same may be further amended, supplemented, extended, restated, replaced or otherwise
modified from time to time, the “Repurchase Agreement”);  
 WHEREAS, all capitalized terms
used herein and not otherwise defined shall have the respective meanings set forth in the Repurchase Agreement;  

WHEREAS, Seller and Buyer desire to modify certain terms and provisions of the Repurchase Agreement as set forth
herein. 
 NOW, THEREFORE, in consideration of ten dollars ($10) and for other good and valuable consideration, the
receipt and legal sufficiency of which are hereby acknowledged, Seller and Buyer covenant and agree as follows as of the Effective Date and Guarantor acknowledges and agrees as to the provision set forth in Section 3 as of
the Effective Date: 
 1. Modification of Repurchase Agreement. The Repurchase Agreement is hereby
modified as of the Effective Date as follows: 

 (a) The definition of “Concentration Limit” is hereby
deleted in its entirety and replaced as follows: 
 ““Concentration Limit” shall mean, unless otherwise
agreed to in writing by Buyer (including, without limitation, in a Confirmation), the test that shall be satisfied at any applicable date of determination, if the aggregate outstanding Purchase Price with respect to all Purchased Loans which are
Participation Interests shall not exceed 33% of the Facility Amount (i) which outstanding Purchase Price for Foreign Purchased Loans shall for purposes of such calculations be converted to U.S. Dollars based on the Purchase Date Spot Rate (U.S.
Dollars) for such Foreign Purchased Loan, and (ii) excluding for purposes of such calculation each CLO Participation A-1 or Additional CLO Participation issued pursuant to a CLO Participation Agreement
for which no Concentration Limit shall be applicable. 
 (b) The definition of “CLO” is hereby deleted in
its entirety and replaced as follows: 
 ““CLO” shall mean any collateral loan obligation bond
transaction issued pursuant to a CLO Indenture. 
 (c) The definition of “CLO Indenture” is hereby deleted
in its entirety and replaced as follows: 
 ““CLO Indenture” shall mean (i) with respect to each
CLO Participation A-1 known as “SunTrust Center”, “Douglas Entrance” and “Ambassador Waikiki II” (each of which was (A) previously subject to a Transaction hereunder (the
Purchase Date for which was December 21, 2017), (B) repurchased by Seller on February 19, 2020 in order for a portion thereof to collateralize the CLO issued by BXMT 2020-FL2, Ltd. and BXMT 2020-FL2, LLC on February 19, 2020, and (C) the remaining portion of which was purchased by Buyer from Seller in a new Transaction hereunder on February 19, 2020), (x) that certain Indenture, dated as
of December 21, 2017 by and among BXMT 2017-FL1, Ltd., as Issuer, BXMT 2017-FL1, LLC, as Co-Issuer, 42-16 CLO L SELL, LLC, as Advancing Agent and Wells Fargo Bank, National Association as Trustee and as Note Administrator (in relation to each CLO Participation A-2 related
thereto) and (y) that certain Indenture, dated as of February 19, 2020 by and among BXMT 2020-FL2, Ltd., as Issuer, BXMT 2020-FL2, LLC, as Co-Issuer, 42-16 CLO L SELL, LLC, as Advancing Agent and Wilmington Trust, National Association, as Trustee, and Wells Fargo Bank, National Association, as Note Administrator
(in relation to each “Participation A-3” issued in the corresponding Whole Loan on February 19, 2020); (ii) with respect to each CLO Participation A-1
and/or Additional CLO Participation the Purchase Date for which is February 19, 2020 (other than those described in the foregoing clause (i)), that certain Indenture, dated as of February 19, 2020 by and among BXMT 2020-FL2, Ltd., as Issuer, BXMT 2020-FL2, LLC, as Co-Issuer, 42-16 CLO L SELL, LLC, as
Advancing Agent and Wilmington Trust, National Association, as Trustee, and Wells Fargo Bank, National Association, as Note 

  
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 Administrator; and (iii) with respect to each other Additional CLO
Participation, the indenture entered into for the corresponding Additional CLO Non-Controlling Participations in connection with the corresponding CLO, each as the same may be amended, modified and/or restated
from time to time.” 
 (d) The definition of “CLO Servicing Agreement” is hereby deleted in its
entirety and replaced as follows: 
 ““CLO Servicing Agreement” shall have the meaning assigned to the
term “Servicing Agreement” in the applicable CLO Participation Agreements, as the same may be amended, modified and/or restated from time to time.” 

(e) The definition of “CLO Participation A-1” is hereby deleted in its
entirety and replaced as follows: 
 ““CLO Participation A-1”
shall have the meaning assigned to the term “Participation A-1” in each applicable CLO Participation Agreement.” For the avoidance of doubt, (x) each “Participation A-1” issued on December 21, 2017 and for which the Purchase Date is December 21, 2017 in respect of the Whole Loans known as “SunTrust Center”, “Douglas Entrance” and
“Ambassador Waikiki II”, (y) each “Amended Participation A-1” issued on February 19, 2020 and for which the Purchase Date is February 19, 2020 in respect of the Whole Loans known
as “SunTrust Center”, “Douglas Entrance” and “Ambassador Waikiki II” and (z) each “Participation A-1” issued on February 19, 2020 and for which the Purchase
Date is February 19, 2020 in respect of the Whole Loans known as “Bank of America Plaza”, “Northbridge Centre”, “Flager”, “Carneros Resort and Spa”, “360 Spear Street” and “LBA Distribution
Portfolio II” shall constitute “CLO Participation A-1s” for all purposes of the Transaction Documents. 

(c) The definition of “CLO Participation A-2” is hereby deleted in its
entirety and replaced as follows: 
 ““CLO Participation A-2”
shall have the meaning assigned to the term “Participation A-2” in each applicable CLO Participation Agreement.” 

(f) The definition of “CLO Participation Agreements” is hereby deleted in its entirety and replaced as
follows: 
 ““CLO Participation Agreements” shall mean, individually or collectively as the context
requires and as applicable to each CLO Participation A-1, Additional CLO Participation and/or Additional Non-Controlling CLO Participation, that certain: 

(i) Participation Agreement and Future Funding Indemnification Agreement, dated as of February 19,
2020, by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial Participation A-1
Holder and Initial Participation A-3 Holder, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “Bank of America Plaza”, 

  
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 (ii) Participation Agreement and Future Funding
Indemnification Agreement, dated as of February 19, 2020, by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial
Participation A-1 Holder and Initial Participation A-3 Holder, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “Northbridge
Centre”, 
 (iii) Participation Agreement and Future Funding Indemnification Agreement, dated as of
February 19, 2020, by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial Participation A-1 Holder and Initial Participation A-3 Holder, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “Flagler”, 

(iv) Participation Agreement and Future Funding Indemnification Agreement, dated as of February 19, 2020,
by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial Participation A-1 Holder
and Initial Participation A-3 Holder, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “Carneros Resort and Spa”, 

(v) Participation Agreement and Future Funding Indemnification Agreement, dated as of February 19, 2020,
by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial Participation A-1 Holder
and Initial Participation A-3 Holder, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “360 Spear Street”, 

(vi) Participation Agreement and Future Funding Indemnification Agreement, dated as of February 19, 2020,
by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial Participation A-1 Holder
and Initial Participation A-3 Holder, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “LBA Distribution Portfolio II”, 

(vii) Participation Agreement and Future Funding Indemnification Agreement, dated as of December 21, 2017,
by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial Participation A-1 Holder,
Wells Fargo Bank, National Association, as Participation Custodial Agent, and Guarantor, as Future Funding Indemnitor, as amended by, inter alia, that certain Second Amendment to Participation Agreement and Future Funding Indemnification
Agreement, dated as of February 19, 2020, by and among 42-16 CLO L Sell, LLC, as Lender and Participation A-3 Holder, BXMT
2017-FL1, Ltd., as Participation A-2 Holder, Seller, as Participation A-1 Holder, Wells Fargo Bank, National Association, as
Participation Custodial Agent, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “SunTrust Center”, 

  
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 (viii) Participation Agreement and Future Funding
Indemnification Agreement, dated as of December 21, 2017, by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial
Participation A-1 Holder, Wells Fargo Bank, National Association, as Participation Custodial Agent, and Guarantor, as Future Funding Indemnitor, as amended by, inter alia, that certain Second Amendment
to Participation Agreement and Future Funding Indemnification Agreement, dated as of February 19, 2020, by and among 42-16 CLO L Sell, LLC, as Lender and Participation
A-3 Holder, BXMT 2017-FL1, Ltd., as Participation A-2 Holder, Seller, as Participation
A-1 Holder, Wells Fargo Bank, National Association, as Participation Custodial Agent, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “Douglas Entrance”, 

(ix) Participation Agreement and Future Funding Indemnification Agreement, dated as of December 21, 2017,
by and among 42-16 CLO L Sell, LLC, as Lender and Initial Participation A-2 Holder, Seller, as Initial Participation A-1 Holder,
Wells Fargo Bank, National Association, as Participation Custodial Agent, and Guarantor, as Future Funding Indemnitor, as amended by, inter alia, that certain Fifth Amendment to Participation Agreement and Future Funding Indemnification
Agreement, dated as of February 19, 2020, by and among 42-16 CLO L Sell, LLC, as Lender and Participation A-3 Holder, BXMT
2017-FL1, Ltd., as Participation A-2 Holder, Seller, as Participation A-1 Holder, Wells Fargo Bank, National Association, as
Participation Custodial Agent, and Guarantor, as Future Funding Indemnitor, with respect to the Purchased Loan known as “Ambassador Waikiki II”, and 

(x) the participation agreement entered into in connection with the corresponding CLO with respect to each
Additional CLO Participation, as each may be amended, modified and/or restated from time to time.” 
 (g) The definition
of “Servicing Agreement” is hereby deleted in its entirety and replaced as follows: 

““Servicing Agreement” shall mean, individually or collectively, as the context may require
(a) other than with respect to each CLO Participation A-1 or Additional CLO Participation issued pursuant to a CLO Participation Agreement, (i) that certain Servicing Agreement, dated as of
June 12, 2013, among Parlex 2, Buyer and Servicer, as the same may be amended, modified and/or restated from time to time, (ii) that certain Servicing Agreement, dated as of January 31, 2014, among Parlex 2A, Buyer, and Servicer, as
the same may be amended, modified and/or restated from time to time, (iii) that certain Servicing Agreement, dated as of the Second Amendment and Restatement Date, among Parlex 2 UK, Buyer, and Servicer, as the same may be amended, modified
and/or restated from time to time, (iv) that certain Servicing Agreement, dated as of the Second Amendment and Restatement Date, among Parlex 2 EUR, Buyer, and Servicer, as the same may be amended, modified and/or restated from time to time,
(v) that certain Servicing 

  
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 Agreement, dated as of the Third Amendment and Restatement Date, among
Parlex 2 AU, Buyer, and Servicer, as the same may be amended, modified and/or restated from time to time, (vi) that certain Servicing Agreement, dated as of the Fourth Amendment and Restatement Date, among Parlex 2 CAD, Buyer, and Servicer, as
the same may be amended, modified and/or restated from time to time, and (vii) any other servicing agreement entered into by a Seller, Buyer and any Servicer approved by Buyer for the servicing of Purchased Loans, as the same may be amended,
modified and/or restated from time to time, and (b) with respect to each CLO Participation A-1 or Additional CLO Participation, as applicable, issued pursuant to a CLO Participation Agreement,
(x) for so long as the corresponding CLO Participation A-2 and/or Additional CLO Non-Controlling Participation, as applicable, is an asset of the applicable CLO,
the corresponding CLO Servicing Agreement and (y) at any time such corresponding CLO Participation A-2 and/or Additional CLO Non-Controlling Participation, as
applicable, is not an asset of such CLO, the servicing agreement entered into in accordance with the applicable CLO Participation Agreement.” 

(h) The definition of “Significant Purchased Loan Modification” is hereby modified by amending and restating the
proviso at the end of such definition as follows: 
 “provided, however, that this definition of “Significant
Purchased Loan Modification” shall not include any modification or amendment to any Purchased Loan Document (including, without limitation, a reduction in the aggregate outstanding principal balance of the applicable CLO Participation A-1 and/or Additional CLO Participation, and a corresponding increase in the aggregate outstanding principal balance of the corresponding CLO Participation A-2 and/or
Additional CLO Non-Controlling Participation via ledger entry) solely in connection with the reallocation of a portion of the principal balance of a CLO Participation
A-1 and/or Additional CLO Participation to the corresponding CLO Participation A-2 and/or Additional CLO Non-Controlling
Participation pursuant to Section 29(a), (b) and/or (c) or comparable provision of the applicable CLO Participation Agreement in order to implement a replenishment pursuant to Section 12.2 or comparable provision of the corresponding
CLO Indenture, so long as such reallocation is implemented in connection with (x) an early repurchase consummated in accordance with Section 3(d) of this Agreement or (y) a pro rata reduction in the outstanding Purchase Price of the
relevant Purchased Loan.” 
 (i) The following defined terms are hereby added to Section 2 of the Repurchase
Agreement in their appropriate alphabetical location as follows: 
 ““Additional CLO Participation”
shall mean a Purchased Loan which is a certificated controlling participation interest in a Whole Loan and/or certificated participation interest in a Whole Loan responsible for all future funding obligations under such Whole Loan, in each case to
the extent that, as of the Purchase Date for such Purchased Loan, a corresponding Additional CLO Non-Controlling Participation is an asset of the 

  
 6 

 corresponding CLO. For the avoidance of doubt, each “Participation A-3” issued on February 19, 2020 in respect of the Whole Loans known as “Bank of America Plaza”, “Northbridge Centre”, “Carneros Resort and Spa”, “360 Spear Street”
and “LBA Distribution Portfolio II” shall constitute “Additional CLO Participations” for all purposes of the Transaction Documents.”     

““Additional CLO Non-Controlling Participation” shall mean a
certificated non-controlling participation in a Whole Loan in which an Additional CLO Participation has been issued pursuant to a CLO Participation Agreement. For the avoidance of doubt, each
“Participation A-3” issued on February 19, 2020 in respect of the Whole Loans known as “SunTrust Center”, “Douglas Entrance” and “Ambassador Waikiki II” shall
constitute “Additional CLO Non-Controlling Participations” for all purposes of the Transaction Documents.” 

(j) Early Repurchase: Section 3(d) of the Repurchase Agreement is hereby deleted in its entirety and replaced with
the following: 
 “(d) No Transaction shall be terminable on demand by Buyer (other than upon the occurrence and during
the continuance of an Event of Default). Seller shall be entitled to terminate a Transaction on demand, in whole or in part (but in the case of a termination in part, solely in connection with the reallocation of a portion of the principal balance
of CLO Participation A-1 and/or Additional CLO Participation to the corresponding CLO Participation A-2 and/or Additional CLO
Non-Controlling Participation pursuant to Section 29(a), (b) and/or (c) (or equivalent section) of the applicable CLO Participation Agreement in order to implement a
replenishment pursuant to Section 12.2 (or equivalent section) of the applicable CLO Indenture), and repurchase the Purchased Loan subject to a Transaction on any Business Day prior to the Repurchase Date (an “Early
Repurchase Date”); provided, however, that: 
  

	 	(i)	 Seller notifies Buyer in writing of its intent to terminate such Transaction and repurchase such Purchased
Loan no later than three (3) Business Days prior to such Early Repurchase Date, 

  

	 	(ii)	 on such Early Repurchase Date Seller pays to Buyer an amount equal to the sum of (x) the Repurchase
Price for such Transaction, (y) the Exit Fee, if any, then due and payable with respect to such Transaction pursuant to the Fee Agreement (provided, however, that no Exit Fee shall be due and payable in connection with a termination of a
Transaction by Seller either (x) in part or (y) in whole in connection with a severing of CLO Participation A-1 and/or Additional CLO Participation into multiple participations representing the
funded portion of CLO Participation A-1 and/or Additional CLO Participation following which a severed portion is reallocated to the corresponding CLO Participation A-2
and/or Additional 

  
 7 

 CLO Non-Controlling Participation
and the other severed portion is the subject of a new Transaction under this Agreement) and (z) any other amounts payable under this Agreement (including, without limitation, Section 3(i) of this Agreement) with respect to such
Transaction, in connection with the transfer to Seller or its agent of such Purchased Loan; provided, however, that no amounts shall be due and payable pursuant to Section 3(i)(ii) of this Agreement in connection with a termination of a
Transaction by Seller in part or in whole in the circumstance described in the parenthetical to clause (ii)(y) above, 
  

	 	(iii)	 on such Early Repurchase Date, following the payment of the amounts set forth in subclause (ii) above,
no unpaid Margin Deficit exists, and 

  

	 	(iv)	 no Default or Event of Default shall have occurred and be continuing as of such Early Repurchase Date.

 Such notice shall set forth the Early Repurchase Date and shall identify with particularity the
Purchased Loans to be repurchased on such Early Repurchase Date.” 
 (k) Servicing: Section 29(f) of the
Repurchase Agreement is hereby deleted in its entirety and replaced with the following: 
 “With respect to each CLO
Participation A-1 and Additional CLO Participation issued pursuant to a CLO Participation Agreement, in the event of any inconsistency between the provisions of this Section 29 and of each applicable CLO
Participation Agreement and the applicable CLO Servicing Agreement, the terms of such CLO Participation Agreement and such CLO Servicing Agreement shall control with respect to such CLO Participation A-1 and
Additional CLO Participation, as applicable, only.” 
 2. Seller’s Representations. Seller has
taken all necessary action to authorize the execution, delivery and performance of this Amendment. This Amendment has been duly executed and delivered by or on behalf of Seller and constitutes the legal, valid and binding obligation of Seller
enforceable against Seller in accordance with its terms subject to bankruptcy, insolvency, and other limitations on creditors’ rights generally and to equitable principles. No Event of Default has occurred and is continuing, and no Event of
Default will occur as a result of the execution, delivery and performance by Seller of this Amendment. Any consent, approval, authorization, order, registration or qualification of or with any Governmental Authority required for the execution,
delivery and performance by Seller of this Amendment has been obtained and is in full force and effect (other than consents, approvals, authorizations, orders, registrations or qualifications that if not obtained, are not reasonably likely to have a
Material Adverse Effect). 
 3. Reaffirmation of Guaranty. Guarantor has executed this Amendment for the
purpose of acknowledging and agreeing that, notwithstanding the execution and delivery of this Amendment and the amendment of the Repurchase Agreement hereunder, all of Guarantor’s obligations under the Guaranty remain in full force and effect
and the same are hereby irrevocably and unconditionally ratified and confirmed by Guarantor in all respects. 

  
 8 

 4. Full Force and Effect. Except as expressly modified
hereby, all of the terms, covenants and conditions of the Repurchase Agreement and the other Transaction Documents remain unmodified and in full force and effect and are hereby ratified and confirmed by Seller. Any inconsistency between this
Amendment and the Repurchase Agreement (as it existed before this Amendment) shall be resolved in favor of this Amendment, whether or not this Amendment specifically modifies the particular provision(s) in the Repurchase Agreement inconsistent with
this Amendment. All references to the “Agreement” in the Repurchase Agreement or to the “Repurchase Agreement” in any of the other Transaction Documents shall mean and refer to the Repurchase Agreement as modified and amended
hereby. 
 5. No Waiver. The execution, delivery and effectiveness of this Amendment shall not operate
as a waiver of any right, power or remedy of the Buyer under the Repurchase Agreement, any of the other Transaction Documents or any other document, instrument or agreement executed and/or delivered in connection therewith. 

6. Headings. Each of the captions contained in this Amendment are for the convenience of reference only
and shall not define or limit the provisions hereof. 
 7. Counterparts. This Amendment may be executed
in any number of counterparts, and all such counterparts shall together constitute the same agreement. Signatures delivered by email (in PDF format) shall be considered binding with the same force and effect as original signatures 

8. Governing Law. This Amendment shall be governed in accordance with the terms and provisions of
Section 20 of the Repurchase Agreement. 
 [No Further Text on this Page; Signature Pages Follow] 

  
 9 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be executed by their duly authorized representatives as of the day and year first above written and effective as of the Effective Date. 
  

			
	 BUYER:
  

CITIBANK, N.A.

		
	 By:
	 	 /s/ Richard B. Schlenger

	Name:	 	Richard B. Schlenger
	Title:	 	Authorized Signatory

 [SIGNATURES CONTINUE ON NEXT PAGE]

 [Signature Page to Third Amendment to Fourth Amended and Restated Master Repurchase Agreement] 

 
			
	 SELLER:
  

PARLEX 2 FINANCE, LLC,
 a
Delaware limited liability company
  

	 By:
	 	 /s/ Douglas N. Armer

	Name:	 	Douglas N. Armer
	 Title:
	 	Executive Vice President, Capital
		 	Markets, and Treasurer

  

			
	 PARLEX 2A FINCO, LLC,

a Delaware limited liability company
  

	 By:
	 	 /s/ Douglas N. Armer

	Name:	 	Douglas N. Armer
	 Title:
	 	Executive Vice President, Capital
		 	Markets, and Treasurer

  

			
	 PARLEX 2 UK FINCO, LLC,

a Delaware limited liability company
  

	 By:
	 	 /s/ Douglas N. Armer

	Name:	 	Douglas N. Armer
	 Title:
	 	Executive Vice President, Capital
		 	Markets, and Treasurer

  

			
	 PARLEX 2 EUR FINCO, LLC,

a Delaware limited liability company
  

	 By:
	 	 /s/ Douglas N. Armer

	Name:	 	Douglas N. Armer
	 Title:
	 	Executive Vice President, Capital
		 	Markets, and Treasurer

  

[Signature Page to Third Amendment to
Fourth Amended and Restated Master Repurchase Agreement] 

 
			
	 PARLEX 2 CAD FINCO, LLC,

a Delaware limited liability company

		
	 By:
	 	 /s/ Douglas N. Armer

	Name:	 	Douglas N. Armer
	 Title:
	 	Executive Vice President, Capital
		 	Markets, and Treasurer

  

			
	 PARLEX 2 AU FINCO, LLC,

a Delaware limited liability company
  

	 By:
	 	 /s/ Douglas N. Armer

	Name:	 	Douglas N. Armer
	 Title:
	 	Executive Vice President, Capital
		 	Markets, and Treasurer

 [SIGNATURES CONTINUE ON NEXT PAGE] 

  

[Signature Page to Third Amendment to
Fourth Amended and Restated Master Repurchase Agreement] 

 
			
	 GUARANTOR:
  

BLACKSTONE MORTGAGE TRUST, INC.,
  

	 By:
	 	 /s/ Douglas N. Armer

		 	Name: Douglas N. Armer
		 	Title:   Executive Vice President, Capital
		 	            Markets and Treasurer

  
 [Signature Page
to Third Amendment to Fourth Amended and Restated Master Repurchase Agreement]EX-10.5

 Exhibit 10.5 

EXECUTION VERSION 

AMENDMENT NO. 12 TO AMENDED AND RESTATED MASTER REPURCHASE 

AND SECURITIES CONTRACT 

AMENDMENT NO. 12 TO AMENDED AND RESTATED MASTER REPURCHASE AND SECURITIES CONTRACT, dated as of March 13, 2020 (this
“Amendment”), between PARLEX 5 FINCO, LLC, a Delaware limited liability company (“Seller”) and WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association (“Buyer”).
Capitalized terms used but not otherwise defined herein shall have the meanings given to them in the Repurchase Agreement (as defined below). 

RECITALS 

WHEREAS, Seller and Buyer are parties to that certain Amended and Restated Master Repurchase and Securities Contract, dated as
of April 4, 2014 (as amended by that certain Amendment No. 1 to Amended and Restated Master Repurchase and Securities Contract, dated as of October 23, 2014, as further amended by that certain Amendment No. 2 to Amended and
Restated Master Repurchase and Securities Contract, dated as of March 13, 2015, as further amended by that certain Amendment No. 3 to Amended and Restated Master Repurchase and Securities Contract, dated as of April 14, 2015, as
further amended by that certain Amendment No. 4 to Amended and Restated Master Repurchase and Securities Contract, dated as of March 11, 2016, as further amended by that certain Amendment No. 5 to Amended and Restated Master
Repurchase and Securities Contract, dated as of June 30, 2016, as further amended by that certain Amendment No. 6 to Amended and Restated Master Repurchase and Securities Contract, dated as of March 13, 2017, as further amended by
that certain Amendment No. 7 to Amended and Restated Master Repurchase and Securities Contract, dated as of March 31, 2017, as further amended by that certain Amendment No. 8 to Amended and Restated Master Repurchase and Securities
Contract, dated as of March 13, 2018, as further amended by that certain Amendment No. 9 to Amended and Restated Master Repurchase and Securities Contract, dated as of December 21, 2018, as further amended by that certain Amendment
No. 10 to Amended and Restated Master Repurchase and Securities Contract, dated as of November 13, 2019, as further amended by that certain Amendment No. 11 to Amended and Restated Master Repurchase and Securities Contract, dated as
of December 23, 2019, as amended hereby and as further amended, restated, supplemented or otherwise modified and in effect from time to time, the “Repurchase Agreement”); 

WHEREAS, Seller has requested, and Buyer has agreed, to amend the Repurchase Agreement as set forth in this Amendment and
Blackstone Mortgage Trust, Inc. (“Guarantor”) agrees to make the acknowledgements set forth herein.     

 Therefore, in consideration of the premises and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, Seller and Buyer hereby agree as follows: 

SECTION 1. Amendment to Repurchase Agreement. The defined term “Funding Expiration Date”, as
set forth in Article 2 of the Repurchase Agreement, is hereby amended and restated in its entirety to read as follows: 

“Funding Expiration Date”: March 13, 2021; provided that, in the event that Seller
requests an extension of the Funding Expiration Date, such request may be approved or denied by Buyer for any reason or for no reason, as determined in Buyer’s sole and absolute discretion, and it is expressly acknowledged and agreed that Buyer
has no obligation to consider or grant any such request. 
 SECTION 2. Amendment Effective Date. This
Amendment and its provisions shall become effective on the date first set forth above (the “Amendment Effective Date”), which is the date that this Amendment was executed and delivered by a duly authorized officer of each of Seller,
Buyer and Guarantor, along with the delivery of bring down letters affirming the opinions as to corporate, enforceability and bankruptcy matters provided to Buyer on the Closing Date, each dated as of the Amendment Effective Date. 

SECTION 3. Representations, Warranties and Covenants. Seller hereby represents and warrants to Buyer, as of the
Amendment Effective Date, that (i) it is in full compliance with all of the terms and provisions and its undertakings and obligations set forth in the Repurchase Agreement and each other Repurchase Document to which it is a party on its part to
be observed or performed, and (ii) no Default or Event of Default has occurred or is continuing. Seller hereby confirms and reaffirms its representations, warranties and covenants contained in each Repurchase Document to which it is a party.

 SECTION 4. Acknowledgments of Guarantor. Guarantor hereby acknowledges (a) the execution and delivery
of this Amendment and agrees that it continues to be bound by that certain Guarantee Agreement, dated as of March 13, 2014 (the “Guarantee Agreement”), made by Guarantor in favor of Buyer, notwithstanding the execution and
delivery of this Amendment and the impact of the changes set forth herein, and (b) that, as of the date hereof Buyer is in compliance with its undertakings and obligations under the Repurchase Agreement, the Guarantee Agreement and each of the
other Repurchase Documents. 
 SECTION 5. Limited Effect. Except as expressly amended and modified by this
Amendment, the Repurchase Agreement and each of the other Repurchase Documents shall continue to be, and shall remain, in full force and effect in accordance with their respective terms; provided, however, that upon the Amendment
Effective Date, each (x) reference therein and herein to the “Repurchase Documents” shall be deemed to include, in any event, this Amendment, (y) each reference to the “Repurchase Agreement” in any of the Repurchase
Documents shall be deemed to be a reference to the Repurchase Agreement, as amended hereby, and (z) each reference in the Repurchase Agreement to “this Agreement”, this “Repurchase Agreement”, this “Amended and Restated
Repurchase Agreement”, “hereof”, “herein” or words of similar effect in referring to the Repurchase Agreement shall be deemed to be references to the Repurchase Agreement, as amended by this Amendment. 

  
 -2- 

 SECTION 6. No Novation, Effect of Agreement. Seller and Buyer
have entered into this Amendment solely to amend the terms of the Repurchase Agreement and do not intend this Amendment or the transactions contemplated hereby to be, and this Amendment and the transactions contemplated hereby shall not be construed
to be, a novation of any of the obligations owing by Seller, Guarantor or Pledgor (the “Repurchase Parties”) under or in connection with the Repurchase Agreement, the Fee Letter, the Pledge and Security Agreement or any of the other
Repurchase Documents to which any Repurchase Party is a party. It is the intention of each of the parties hereto that (i) the perfection and priority of all security interests securing the payment of the Repurchase Obligations of the Repurchase
Parties under the Repurchase Agreement and the Pledge and Security Agreement are preserved, (ii) the liens and security interests granted under the Repurchase Agreement and the Pledge and Security Agreement continue in full force and effect,
and (iii) any reference to the Repurchase Agreement in any such Repurchase Document shall be deemed to also reference this Amendment. 

SECTION 7. Counterparts. This Amendment may be executed by each of the parties hereto on any number of separate
counterparts, each of which shall be an original and all of which taken together shall constitute one and the same instrument. Delivery of an executed counterpart of a signature page to this Amendment in Portable Document Format (PDF) or by
facsimile transmission shall be effective as delivery of a manually executed original counterpart thereof. 
 SECTION 8.
Expenses. Seller and Guarantor agree to pay and reimburse Buyer for all out-of-pocket costs and expenses incurred by Buyer in connection with the preparation,
execution and delivery of this Amendment, including, without limitation, the fees and disbursements of Cadwalader, Wickersham & Taft LLP, counsel to Buyer 

SECTION 9. GOVERNING LAW. THIS AMENDMENT AND ANY CLAIM, CONTROVERSY OR DISPUTE ARISING UNDER OR
RELATED TO THIS AMENDMENT, THE RELATIONSHIP OF THE PARTIES TO THIS AMENDMENT, AND/OR THE INTERPRETATION AND ENFORCEMENT OF THE RIGHTS AND DUTIES OF THE PARTIES TO THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS
AND DECISIONS OF THE STATE OF NEW YORK, WITHOUT REGARD TO THE CHOICE OF LAW RULES THEREOF. THE PARTIES HERETO INTEND THAT THE PROVISIONS OF SECTION 5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW SHALL APPLY TO
THIS AMENDMENT. 
 [SIGNATURES FOLLOW] 

  
 -3- 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly
executed and delivered as of the day and year first above written. 
  

			
	 SELLER:
  

PARLEX 5 FINCO, LLC, a Delaware limited

      liability company

		
	 By:
	 	 /s/ Douglas N. Armer

		 	Name: Douglas N. Armer
		 	 Title:   Executive Vice President, Capital

		 	            Markets, and Treasurer

 [Amendment No. 12 to Amended and Restated Master Repurchase and Securities Contract] 

			
	 BUYER:
  

WELLS FARGO BANK, N.A., a national

      banking association

		
	 By:
	 	 /s/ Allen Lewis

		 	Name: Allen Lewis
		 	Title:   Managing Director

 [Amendment No. 12 to
Amended and Restated Master Repurchase and Securities Contract] 

			
	 With respect to the acknowledgments set forth

    in Section 4 herein:

 
 GUARANTOR:

 
 BLACKSTONE MORTGAGE TRUST, INC., a

    Maryland corporation

		
	 By:
	 	 /s/ Douglas N. Armer

		 	Name: Douglas N. Armer
		 	Title:   Executive Vice President, Capital
		 	            Markets, and Treasurer

 [Amendment No. 12 to Amended and Restated Master Repurchase and Securities Contract]

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