Document:

Assumption and Joinder Agreement

 Exhibit 10.57 
 ASSUMPTION AND JOINDER AGREEMENT 
 This ASSUMPTION AND JOINDER AGREEMENT,
dated as of January 29, 2013 (this “Joinder Agreement”), is made by KBSIII TOWER AT LAKE CAROLYN, LLC, a Delaware limited liability company (the “Additional Borrower”), each of the other Borrowers
party to the Loan Agreement referred to below, and U.S. Bank National Association, a national banking association, as administrative agent for the Lenders party to the Loan Agreement referred to below (“Agent”) and the
Lenders described below. 
 RECITALS 
 A.        Reference is made to that certain Loan Agreement dated as of April 30, 2012 (as amended, restated, extended, supplemented, or otherwise modified in
writing from time to time, the “Loan Agreement”), among KBSIII DOMAIN GATEWAY, LLC, a Delaware limited liability company, KBSIII LAS CIMAS IV, LLC, a Delaware limited liability company, KBSIII 1550 WEST
MCEWEN DRIVE, LLC, a Delaware limited liability company, and KBSIII 155 NORTH 400 WEST, LLC, a Delaware limited liability company, and each other New Borrower that has become a Borrower under the Loan Agreement (each, an
“Existing Borrower” and, collectively, “Existing Borrowers”), each lender from time to time a party hereto (individually, a “Lender” and collectively, the
“Lenders”), and Agent. Any capitalized term used and not defined in this Joinder Agreement shall have the meaning given to such term in the Loan Agreement. This Joinder Agreement is a “Joinder Agreement” described
in the Loan Agreement. 
 B.        The Additional Borrower is a New Borrower which is
owned, directly or indirectly, by Guarantor. 
 C.        Pursuant to
Section 7.21 of the Loan Agreement, Existing Borrowers and the Additional Borrower have requested that certain real property owned by the Additional Borrower (the “Additional Property”) more particularly described
on Exhibit A attached hereto be included in the Borrowing Base Value and Borrowing Base Amount as an Additional Property. The legal description of the Additional Property attached as Exhibit A hereto is hereby added to Exhibit
C of the Loan Agreement. The Additional Property Improvements (the “KBS Lake Carolyn Improvements”) are described in Exhibit B attached hereto and incorporated herein, and are by this reference added to Exhibit
B of the Loan Agreement. The Cost Basis of the Additional Property is $45,718,738.56. The U.S. EIN of Additional Borrower is 46-1568803. 
 D.        The Committed Amount of the Loan is being increased from $108,000,000 to $200,000,000.00 (as amended, the “Loan”) in connection
with (i) the execution and delivery of, among other documents, (a) this Agreement, (b) that certain Third Modification and Additional Advance Agreement dated as of even date herewith by and between Existing Borrowers, Additional
Borrower, Agent and Lenders (the “Third Modification Agreement”), and (c) the “Notes” as defined and described in the Third Modification Agreement, and (ii) the addition of the Additional
Property as collateral for the Loan. Upon the effective date of this Joinder Agreement (and prior to the disbursement of any portion of the Additional Advance (as defined 

  
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in the Third Modification Agreement)), the outstanding principal balance of the Loan is $63,200,000.00. 
 E.        As one of the conditions to the admission of the Additional Property as an Approved Property, the parties hereto are executing this Joinder Agreement.

 NOW, THEREFORE, in consideration of the foregoing Recitals and the terms, covenants, and conditions of this Joinder
Agreement, the receipt of which and sufficiency of which are hereby acknowledged, the Additional Borrower, Existing Borrowers, Agent and Lenders agree as follows: 
 1.        Joinder as Borrower; Additional Property as a Property. The Additional Borrower assumes and agrees to be bound by all of the terms, obligations,
covenants, representations, warranties and conditions of the Loan Agreement, the Notes, the Fee Letter, the Environmental Indemnity, jointly and severally with the other Persons comprising the Borrowers, and assumes and agrees to be bound thereby,
and shall be deemed to be a party thereto, as a Borrower and Indemnitor (as defined in the Environmental Indemnity), as if the Additional Borrower had originally executed the Loan Agreement, the Notes, the Fee Letter and the Environmental Indemnity.
The Additional Borrower hereby agrees (i) that the Additional Property shall constitute a Property for all purposes under the Loan Agreement, Environmental Indemnity and the other Loan Documents and (ii) to execute and deliver such
additional documents as Agent may reasonably require, including a Deed of Trust. 

2.        Consent And Acceptance. Existing Borrowers, Agent, Lenders and Guarantors (by
their signatures to the consent attached hereto) hereby consent to the assumption of the Loan Agreement, the Notes, the Fee Letter, and the Environmental Indemnity and the Obligations by the Additional Borrower and agree and acknowledge that after
the date of this Joinder Agreement, (i) the Additional Borrower shall be a “Borrower” and (ii) the Additional Property shall be a “Property,” for all purposes of the Loan Agreement, the
Notes, the Fee Letter and the Environmental Indemnity and each of the other Loan Documents, including for purposes of the indemnity provided to Agent and Lenders by each of the Borrowers (including Additional Borrower upon execution of this Joinder
Agreement) under the Environmental Indemnity. 
 3.        Ownership of Additional
Borrower. The Additional Borrower and each other Borrower represent and warrant to Lenders and Agent that the Additional Borrower is wholly-owned, directly or indirectly, by Properties REIT. 

4.        Legal Status; Organizational Documents. The Additional Borrower represents and
warrants to Agent and each Lender that (i) true, correct and accurate copies of all of the organizational documents of the Additional Borrower have been delivered to Agent and (ii) Additional Borrower is a limited liability company duly
formed, validly existing and in good standing under the laws of the State of Delaware and is duly registered and qualified to transact business in, and is in good standing under the laws of, the state in which the Additional Property it owns is
located, and has all power, authority, permits, consents, authorizations and licenses necessary to carry on its business, to construct, equip, own and operate such Additional Property and to execute, deliver and perform this Agreement and the other
Loan Documents; all consents of the members of Additional Borrower necessary to authorize the execution, delivery and 

  
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performance of this Joinder Agreement and of the other Loan Documents which have been or are to be executed by and on behalf of Additional Borrower have been duly obtained and are in full force
and effect; this Joinder Agreement and such other Loan Documents have been duly authorized, executed and delivered by and on behalf of Additional Borrower so as to constitute this Joinder Agreement and such other Loan Documents the valid and binding
obligations of Additional Borrower, enforceable in accordance with their terms; and Additional Borrower has complied with all applicable assumed and/or fictitious name requirements of the state in which it is organized and of the state in which the
Additional Property it owns is located, if different. 
 5.        No Default;
Compliance with Loan Agreement. The Additional Borrower and each other Borrower covenant, represent and warrant to Agent and each Lender that: 
 (a)        Additional Borrower owns fee title to the Additional Property, does not own any other property other than the Additional Property, and has satisfied the
other requirements set forth in Section 7.21(b) of the Loan Agreement. 

(b)        To the best of Additional Borrower’s knowledge, the Additional
Property is free from all Hazardous Substances except as disclosed in that certain Phase I Environmental Site Assessment prepared by ENVIRON International Corporation dated as of December, 2012 (Project No. 04-5242GZ), in the form disclosed to
Agent as of the date of the recordation of a Deed of Trust against the Additional Property. 

(c)        The Additional Property and all related personal property is free and
clear of all liens, charges and encumbrances other than Permitted Encumbrances (as defined in the Loan Agreement) or except as otherwise agreed by Agent in writing. For purposes of clarification, the Deed of Trust to be recorded against the
Additional Property shall be a “Deed of Trust” as defined in the Loan Agreement and the title policy insuring Agent’s and the Lenders’ lien under such Deed of Trust shall be a “Title Policy” as defined in the Loan
Agreement. Exhibit D to the Loan Agreement is hereby deemed to include reference to such Title Policy and Deed of Trust. 
 (d)        Except as otherwise disclosed to Agent in writing, each of the representations and warranties made by Borrowers pursuant to the Loan Agreement,
including, without limitation, those set forth in Article IV therein, are true and correct in all material respects with regard to the Additional Borrower. 

(e)        No Event of Default, or event which, with notice or lapse of time or
both, could become an Event of Default, has occurred and is continuing under any Loan Document. 

(f)        Additional Borrower has been afforded the opportunity to carefully
read this Agreement, the Loan Agreement, the Notes, the Fee Letter and the Environmental Indemnity (as such documents may be amended pursuant to the Third Modification Agreement), and to review such documents with an attorney of Additional
Borrower’s choice before signing this Agreement. Additional Borrower acknowledges having read and understood the meaning and effect of this Agreement, the Loan Agreement, the Notes, the Fee Letter, and the Environmental Indemnity before signing

  
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this Agreement and understands it shall thereafter be bound by the Loan Documents and liable for all Obligations owing by Borrowers under the Loan Documents. 

6.        Counterparts; Joint Borrower Provisions. This Joinder Agreement may be executed
in multiple counterparts, each of which shall constitute an original but all of which when taken together shall constitute one and the same instrument. Section 7.19 of the Loan Agreement (the joint borrower provisions) is by this reference
hereby incorporated herein in its entirety. 
 7.        Governing Law. The
validity, enforcement, and interpretation of this Joinder Agreement, shall for all purposes be governed by and construed in accordance with the laws of the State of California and applicable United States federal law, and is intended to be performed
in accordance with, and only to the extent permitted by, such laws. To the maximum extent permitted by applicable law, Additional Borrower hereby waives any right to a trial by jury in any action relating to the Loan and/or the Loan Documents.

 8.        Limited Recourse Provision. Section 7.25 of the Loan
Agreement (the limited recourse provisions) is by this reference hereby incorporated herein in its entirety. 
 [SIGNATURE PAGES
FOLLOW] 

  
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 IN WITNESS WHEREOF, this Joinder Agreement is executed as of the date first above written.

  

																	
		 		 	ADDITIONAL BORROWER:	 	
				
		 		 	KBSIII TOWER AT LAKE CAROLYN, LLC,	 	
		 		 	a Delaware limited liability company	 	
					
		 		 	By:	    	 KBSIII REIT ACQUISITION VI, LLC,
 a Delaware limited liability company,
 its sole member
	 	
						
		 		 		    	By:	    	 KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability company,
 its sole member
	 	
							
		 		 		    		    	By:	    	 KBS LIMITED PARTNERSHIP III,
 a Delaware limited partnership,
 its sole member
	 	
							
		 		 		    		    		    	By:	    	 KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland corporation,
 its general partner

									
		 		 		    		    		    		    	By:	    	 /s/ Charles J. Schreiber, Jr.
	 	
		 		 		    		    		    		    		    	 Charles J. Schreiber, Jr.,

Chief Executive Officer
	 	

 [SIGNATURES CONTINUE ON FOLLOWING PAGE] 

  
 S-1

															
		 	 EXISTING BORROWERS:

 

		 	 KBSIII DOMAIN GATEWAY, LLC,
 a Delaware limited liability company

				
		 	By:	    	 KBSIII REIT ACQUISITION I, LLC,
 a Delaware limited liability company,
 its sole member
	  	
					
		 		    	By:	    	 KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability company,
 its sole member
	  	
						
		 		    		    	By:	    	 KBS LIMITED PARTNERSHIP III,
 a Delaware limited partnership,
 its sole member
	  	
						
		 		    		    		    	By:	    	 KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland corporation,
 its general partner

								
		 		    		    		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		 		    		    		    		    		  	 Charles J. Schreiber, Jr.,

Chief Executive Officer
	  	

 [SIGNATURES CONTINUE ON FOLLOWING PAGE] 

  
 S-1

															
		 	KBSIII LAS CIMAS IV, LLC,
		 	a Delaware limited liability company
				
		 	By:	    	 KBSIII REIT ACQUISITION II, LLC,
 a Delaware limited liability company,
 its sole member
	  	
					
		 		    	By:	    	 KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability company,
 its sole member
	  	
						
		 		    		    	By:	    	 KBS LIMITED PARTNERSHIP III,
 a Delaware limited partnership,
 its sole member
	  	
						
		 		    		    		    	By:	    	 KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland corporation,
 its general partner

								
		 		    		    		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		 		    		    		    		    		  	 Charles J. Schreiber, Jr.,

Chief Executive Officer
	  	

 [SIGNATURES CONTINUE ON FOLLOWING PAGE] 

  
 S-2

															
		 	KBSIII 1550 WEST MCEWEN DRIVE, LLC,
		 	a Delaware limited liability company
				
		 	By:	    	 KBSIII REIT ACQUISITION IV, LLC,
 a Delaware limited liability company,
 its sole member
	  	
					
		 		    	By:	    	 KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability company,
 its sole member
	  	
						
		 		    		    	By:	    	 KBS LIMITED PARTNERSHIP III,
 a Delaware limited partnership,
 its sole member
	  	
						
		 		    		    		    	By:	    	 KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland corporation,
 its general partner

								
		 		    		    		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		 		    		    		    		    		  	 Charles J. Schreiber, Jr.,

Chief Executive Officer
	  	

 [SIGNATURES CONTINUE ON FOLLOWING PAGE] 

  
 S-3

															
		 	KBSIII 155 NORTH 400 WEST, LLC,
		 	a Delaware limited liability company
				
		 	By:	    	 KBSIII REIT ACQUISITION V, LLC,
 a Delaware limited liability company,
 its sole member
	  	
					
		 		    	By:	    	 KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability company,
 its sole member
	  	
						
		 		    		    	By:	    	 KBS LIMITED PARTNERSHIP III,
 a Delaware limited partnership,
 its sole member
	  	
						
		 		    		    		    	By:	    	 KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland corporation,
 its general partner

								
		 		    		    		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		 		    		    		    		    		  	 Charles J. Schreiber, Jr.,

Chief Executive Officer
	  	

 [SIGNATURES CONTINUE ON FOLLOWING PAGE] 

  
 S-4

 
			
	 AGENT:
  

U.S. BANK NATIONAL ASSOCIATION,
 a national
banking association,
 as Administrative Agent

		
	By:	 	 /s/ Adrian B. Montero

	Name:	 	 Adrian B. Montero

	Title:	 	 Senior Vice President

	
	 LENDERS:
  

U.S. BANK NATIONAL ASSOCIATION,
 a national
banking association

		
	By:	 	 /s/ Adrian B. Montero

	Name:	 	 Adrian B. Montero

	Title:	 	 Senior Vice President

	
	REGIONS BANK
		
	By:	 	 /s/ Lee Surtees

	Name:	 	 Lee Surtees

	Title:	 	 Vice President

	
	FIFTH THIRD BANK, an Ohio banking corporation
		
	By:	 	 /s/ Matthew Rodgers

	Name:	 	 Matthew Rodgers

	Title:	 	 Vice President

  
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 CONSENT OF GUARANTOR: 

KBS REIT PROPERTIES III, LLC, a Delaware limited liability company and KBS REAL ESTATE INVESTMENT TRUST III, INC., a
Maryland corporation (collectively, “Guarantor”), hereby (i) consent to the terms, conditions and provisions of the foregoing Joinder Agreement and the transactions contemplated by such Joinder Agreement, including,
without limitation, the admission of the Additional Borrower as a Borrower under the Loan Agreement and the other Loan Documents, and the assumption of the Obligations by the Additional Borrower, and (ii) reaffirm the full force and
effectiveness of that certain Repayment Guaranty dated as of April 30, 2012, executed by Guarantor in favor of Agent, as it has been amended. 
  

											
	KBS REIT PROPERTIES III, LLC,	  	
	a Delaware limited liability company	  	
			
	By:	    	KBS LIMITED PARTNERSHIP III,
 a Delaware limited
partnership,
 its sole member
	  	
			
		    	By:	    	KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland
corporation
 its general partner

					
		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		    		    		  	 Charles J. Schreiber, Jr.,
 Chief Executive Officer
	  	

 KBS REAL ESTATE INVESTMENT TRUST III, INC., 
 a Maryland corporation 
  

			
	By:	 	 /s/ Charles J. Schreiber, Jr.

		 	Charles J. Schreiber, Jr.,
		 	Chief Executive Officer

  
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 EXHIBIT A 
 Legal Description of Additional Property (Lake Carolyn) 
 That certain real property located in
the County of Dallas, State of Texas and more particularly described as follows: 
 TRACT 1: 

BEING a tract of land situated in the Elizabeth Crockett Survey, Abstract No. 217, in the City of Irving, Dallas County, Texas, and being all of Lot
1, Block II of Las Colinas Urban Center, Revised Thirty-first Installment, as recorded in Volume 87045, Page 1492 of the Deed Records of Dallas County, Texas, and being more particularly described as follows: 

BEGINNING at a “+” cut in concrete found for corner at the intersection of the southerly right-of-way line of O’Connor Boulevard
(110’ R.O.W.) with the cut-off line between the said southerly right-of-way line of O’Connor Boulevard and the westerly right-of-way line of Las Colinas Boulevard East (110’ R.O.W.); 

THENCE, along said cut-off line and the westerly right-of-way line of Las Colinas Boulevard as follows: 

South 60 degrees 53 minutes 29 seconds East a distance of 28.70 feet to a “+” cut in concrete found for corner; 

South 16 degrees 43 minuted 45 seconds East a distance of 60.28 feet to a “+” cut in concrete found for corner and the beginning of a curve to
the left from which the radius point bears North 73 degrees 16 minutes 15 seconds East a distance of 878.52 feet; 
 Along said curve to the
left through a central angle of 24 degrees 47 minutes 15 seconds and an arc length of 380.07 feet to a “+” cut in concrete found for corner at the point of tangency; 
 South 41 degrees 31 minutes 00 seconds East a distance of 7.25 feet to a “+” cut in concrete found for corner; 
 THENCE, South 54 degrees 20 minutes 56 seconds West, departing the westerly right-of-way line of Las Colinas Boulevard East, a distance of 113.80 feet to a “V” cut in brick paver found for
corner ; 
 THENCE, South 09 degrees 20 minutes 56 seconds West, a distance of 36.89 feet to a “+” cut in concrete found for corner;

 THENCE, North 80 degrees 39 seconds 04 seconds West, a distance of 105.34 feet to a “+” cut in concrete found for corner;

  
 A-1

 THENCE, South 54 degrees 20 minutes 56 seconds West, a distance of 57.74 feet to a 1/2-inch iron rod with
“RLG” cap found for corner; 
 THENCE, North 80 degrees 39 minutes 04 seconds West, a distance of 155.33 feet to a 1/2-inch iron rod
found for corner; 
 THENCE, South 54 degrees 20 minutes 56 seconds West, a distance of 76.31 feet to a “+” cut in concrete found for
corner on the dry side of a concrete retaining wall along Lake Carolyn; 
 THENCE, continuing along the dry side of the aforementioned concrete
retaining wall as follows: 
 North 03 degrees 01 minute 32 seconds West, a distance of 79.19 feet to a “+” cut in concrete found for
corner; 
 North 21 degrees 54 minutes 10 seconds East, a distance of 235.32 feet to a “+” cut in concrete found for corner;

 North 21 degrees 55 minutes 59 seconds West, a distance of 166.47 feet to a “+” cut in concrete found for corner; 

North 10 degrees 11 minutes 38 seconds West, a distance of 18.61 feet to a “+” cut in concrete found for corner; 

THENCE, departing said concrete retaining wall, North 79 degrees 48 minutes 22 seconds East, a distance of 41.01 feet to a “+” cut in concrete
found for corner; 
 THENCE, North 10 degrees 11 minutes 45 seconds West a distance of 27.80 feet to a “+” cut in concrete found for
corner in the south right-of-way line of said O’Connor Boulevard and being in a curve to the left from which the radius point bears North 10 degrees 23 minutes 33 seconds West a distance of 2394.17 feet; 

THENCE, continuing along said curve to the left in a northeasterly direction along the southerly right-of-way line of O’Connor Boulevard through a
central angle of 04 degrees 25 minutes 19 seconds and an arc length of 184.78 feet to the POINT OF BEGINNING and containing 154,405 square feet or 3.5446 acres of land, more or less. 
 TRACT 2: 
 Easements rights in and to the Common Properties as created and defined under terms,
conditions and stipulations in the Declaration, as hereinafter defined in that certain Declaration - Las Colinas Area I, Dallas County, Texas, dated August 22, 1973, recorded August 22, 1973 in Volume 73166, Page 1001, as amended and
supplemented. 

  
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 EXHIBIT B 
 Description of KBS Lake Carolyn Improvements 
 The KBS Lake Carolyn Improvements include an office
building totaling approximately 364,336 rentable square feet, constructed in 1988 but fully renovated between 2005 and 2011 and containing approximately 1,113 parking spaces. 

  
 B-1Amended and Restated Promissory Note

 Exhibit 10.58 
 AMENDED AND RESTATED PROMISSORY NOTE 
 (Revolving Loan)

  

			
	$30,000,000.00	 	January 29, 2013

 FOR VALUE RECEIVED, KBSIII DOMAIN GATEWAY, LLC, a Delaware limited
liability company, KBSIII LAS CIMAS IV, LLC, a Delaware limited liability company, KBSIII 1550 WEST MCEWEN DRIVE, LLC, a Delaware limited liability company, KBSIII 155 NORTH 400 WEST, LLC, a Delaware limited liability company,
and KBSIII TOWER AT LAKE CAROLYN, LLC, a Delaware limited liability company (together with each New Borrower now or hereafter bound under the Loan Agreement and this Note as a Borrower pursuant to a Joinder Agreement, hereinafter called
“Borrower”), promises to pay to the order of FIFTH THIRD BANK, an Ohio banking corporation (hereinafter, together with any subsequent holder hereof, called “Lender”), or permitted assigns, at the office of
U.S. Bank National Association, as agent (“Agent”) for itself and for the other financial institutions (collectively, the “Lenders”) which are or may in the future become parties to the Loan Agreement (as
hereinafter defined), at its office at 4100 Newport Place, Suite 900, Newport Beach, California 92660, Attn: Commercial Real Estate, or at such other place as Agent may from time to time designate in writing, on or before the Maturity Date, the
principal sum of Thirty Million and No/100 Dollars ($30,000,000.00), or so much thereof as may have been advanced to or for the benefit of Borrower from time to time in accordance with the terms set forth in that certain Loan Agreement dated as of
April 30, 2012, by and between, inter alia, Borrower, the Lenders and Agent, as amended by that certain Additional Advance and Modification Agreement (Long Form) (the “Additional Advance and Modification
Agreement”) executed by Borrower, the Lenders and Agent and dated as of June 1, 2012, as further amended by that certain Second Modification Agreement executed by Borrower, the Lenders and Agent and dated as of September 28, 2012,
as further amended by that certain Third Modification and Additional Advance Agreement (Long Form) (the “Third Modification”) executed by Borrower, the Lenders and Agent and dated as of even date herewith (as amended, the
“Loan Agreement”) and remains unpaid from time to time (hereinafter called “Principal Balance”), with interest on the Principal Balance, until paid in full, at the rates per annum specified in the Loan Agreement, in
coin or currency, which, at the time or times of payment, is legal tender for the payment of public and private debts in the United States of America, all in accordance with the terms hereinafter set forth and set forth in the Loan Agreement. This
Note (together with any other “Note” issued pursuant to the Third Modification and the Loan Agreement from time to time) renews, amends, restates and replaces, in its entirety, that certain Promissory Note (Revolving Loan) executed by
Borrower to the order of U.S. Bank National Association, a national banking association, and dated as of April 30, 2012 in the face principal amount of $100,000,000.00, as subsequently increased to $108,000,000.00 pursuant to the Additional
Advance and Modification Agreement (as amended, the “Existing Note”). This Note is not intended to, nor shall it be construed to, constitute a novation of the Existing Note or the obligations contained therein. 

This Note is one of one or more promissory notes in the aggregate principal amount of $200,000,000.00 issued pursuant to
the Loan Agreement (collectively, the “Note”), which Note is secured, inter alia, by each Deed of Trust (as defined in the Loan Agreement), executed by a Borrower and given to Agent, covering a Property (as
defined in the Loan Agreement). All of 

  
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the agreements, conditions, covenants, warranties, representations, provisions and stipulations made by or imposed upon Borrower under the Loan Documents are hereby made a part of this Note to
the same extent and with the same force and effect as if they were fully inserted herein, and Borrower covenants and agrees to keep and perform the same, or cause them to be kept and performed, strictly in accordance with their terms. 

From and after the date hereof, and until the date on which this Note is paid in full, interest shall accrue and Borrower
shall pay interest on the Principal Balance on the terms more particularly set forth in the Loan Agreement. A portion of the Principal Balance on this Note shall constitute a revolving loan that Borrower may borrow, repay and re-borrow for the
purposes stated in the Loan Agreement upon the satisfaction of the terms and conditions set forth therein. 

Time is of the essence hereof. Upon the occurrence and during the continuation of an Event of Default under the Loan
Agreement or any of the other Loan Documents (as defined in the Loan Agreement), then, in any such case, the entire Principal Balance, with all accrued interest thereon, together with all other sums evidenced or secured by the Loan Documents, shall,
at the option of Agent on behalf of Lenders, become immediately due and payable and Lender’s obligation to make additional advances hereunder or under the Loan Agreement shall, at the option of Agent on behalf of Lenders, be terminated, without
notice, demand or presentment for payment, and without notice of intention to accelerate or of acceleration, at the place of payment aforesaid. Except as herein expressly provided, no modification or amendment of the terms of this Note shall be
effective unless made in a writing signed by Borrower and Lender. 
 Each Borrower, co–borrower, endorser
or other party who may become liable under this Note hereby, agrees to make payment of this Note, and waives demand for payment, presentment for payment, notice of nonpayment, protest, notice of protest, notice of dishonor, notice of intention to
accelerate maturity, notice of acceleration of maturity, all other notices as to this Note (provided however, this shall not affect such Person’s notice and cure rights which are expressly provided for in the Loan Documents), diligence in
collection as to each and every payment due hereunder, and all other requirements necessary to charge or hold such person or entity to any obligation hereunder, and agrees that without any notice Agent on behalf of Lenders may take security herefor
or may release any or all security herefor, or may from time to time extend, renew, or otherwise modify the date or dates or amount or amounts of payment above recited, and that, in any such case, each Borrower, co–borrower, endorser or other
party who may become liable under this Note (including each New Borrower upon execution of a Joinder Agreement), shall continue to be bound hereby and to be liable to pay the unpaid balance of the indebtedness evidenced hereby, as so additionally
secured, extended, renewed or modified, and notwithstanding any such release; and further agrees to pay all costs and expenses of collection, including court costs and attorneys’ fees (prior to trial, at trial and on appeal) incurred in
collecting the indebtedness evidenced hereby, or in exercising or defending, or obtaining the right to exercise the rights of Agent on behalf of Lenders hereunder, under the Loan Agreement or under any other Loan Document, whether suit be brought or
not, and in bankruptcy, insolvency, arrangement, reorganization and other debtor–relief proceedings, in probate, in other court proceedings, or otherwise, whether or not Agent prevails therein except in the event Borrower prevails pursuant to a
final judicial determination, and, except as may be expressly otherwise set forth in any of the Loan Documents, all costs and expenses incurred by Agent 

  
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and/or Lenders in protecting or preserving the interests which are the subject of the Loan Documents. Section 7.19 of the Loan Agreement (the joint borrower provisions) is by this reference
incorporated herein in its entirety. 
 This Note is made with reference to and shall be construed in accordance
with and governed by the laws of the State of California for all purposes, including, but not limited to, the purpose of determining the maximum rate of interest, if any, which may be lawfully received hereunder by the holder hereof. 

The term “Borrower” as used in this Note shall mean and have reference to, collectively, all parties and
each of them directly or indirectly obligated for the indebtedness evidenced by this Note, whether as principal borrower, maker, endorser, or otherwise, together with the respective heirs, administrators, executors, legal representatives, successors
and assigns of each of the foregoing. 
 All capitalized terms not otherwise defined herein shall have the
meaning given them in the Loan Agreement. 
 Each party to this Note hereby expressly waives any right to trial
by jury of any claim, demand, action or cause of action (1) arising under this Note or any other instrument, document or agreement executed or delivered in connection therewith, or (2) in any way connected with or related or incidental to
the dealings of the parties hereto or any of them with respect to this Note or any other instrument, document or agreement executed or delivered in connection herewith, or the transactions related hereto or thereto, in each case whether now existing
or hereafter arising, and each party hereby agrees and consents that any such claim, demand, action or cause of action shall be decided by court trial without a jury, and that any party to this Note may file an original counterpart or a copy of this
section with any court as written evidence of the consent of the parties hereto to the waiver of their right to trial by jury. 

Limited Recourse Provision. Except as to each Guarantor as set forth in the Guaranty, Agent and Lenders shall have no
recourse against, nor shall there be any personal liability to, the members of any Borrower, or to any shareholders, members, partners, beneficial interest holders or any other entity or person in the ownership (directly or indirectly) of any
Borrower (except for each Guarantor as provided in the Guaranty, but including KBSIII REIT ACQUISITION I, LLC, KBSIII REIT ACQUISITION II, LLC, KBSIII REIT ACQUISITION IV, LLC, KBSIII REIT ACQUISITION V, LLC, KBSIII REIT ACQUISITION VI, LLC, KBS
Real Estate Investment Trust III, Inc. (once and after KBS Real Estate Investment Trust III, Inc. has been released from its obligations under the Guaranty) or KBS LIMITED PARTNERSHIP III) with respect to the obligations of Borrower and Guarantors
under the Loan. For purposes of clarification, in no event shall the above language limit, reduce or otherwise affect any Borrower’s liability or obligations under the Loan Documents, any Guarantor’s liability or obligations under the
Guaranty or Agent’s right to exercise any rights or remedies against any collateral securing the Loan.  
 [SIGNATURE
ON FOLLOWING PAGE] 

  
 -3-

 IN WITNESS WHEREOF, each Borrower has caused this Note to be duly executed
and delivered as of the day and year first above set forth. 
 KBSIII DOMAIN GATEWAY, LLC, 

a Delaware limited liability company 
  

													
	By:	    	KBSIII REIT ACQUISITION I, LLC,
 a Delaware limited
liability company,
 its sole member

			
		    	By:	    	KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability
company,
 its sole member

				
		    		    	By:	    	KBS LIMITED PARTNERSHIP III,
 a Delaware limited
partnership,
 its sole member

					
		    		    		    	By:	    	KBS REAL ESTATE INVESTMENT TRUST III, INC.,

a Maryland corporation,
 its general
partner

							
		    		    		    		    	By:	 	 /s/ Charles J. Schreiber, Jr.
	  	
		    		    		    		    		 	Charles J. Schreiber, Jr.,	  	
		    		    		    		    		 	Chief Executive Officer	  	

  
 S-1

													
	KBSIII LAS CIMAS IV, LLC,
	a Delaware limited liability company
		
	By:	    	KBSIII REIT ACQUISITION II, LLC,
 a Delaware limited
liability company,
 its sole member

			
		    	By:	    	KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability
company,
 its sole member

				
		    		    	By:	    	KBS LIMITED PARTNERSHIP III,
 a Delaware limited
partnership,
 its sole member

					
		    		    		    	By:	    	KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland
corporation,
 its general partner

							
		    		    		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		    		    		    		    		  	Charles J. Schreiber, Jr.,	  	
		    		    		    		    		  	Chief Executive Officer	  	

  
 S-2

													
	KBSIII 1550 WEST MCEWEN DRIVE, LLC,
	a Delaware limited liability company
		
	By:	    	KBSIII REIT ACQUISITION IV, LLC,
 a Delaware limited
liability company,
 its sole member

			
		    	By:	    	KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability
company,
 its sole member

				
		    		    	By:	    	KBS LIMITED PARTNERSHIP III,
 a Delaware limited
partnership,
 its sole member

					
		    		    		    	By:	    	KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland
corporation,
 its general partner

							
		    		    		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		    		    		    		    		  	Charles J. Schreiber, Jr.,	  	
		    		    		    		    		  	Chief Executive Officer	  	

  
 S-3

													
	KBSIII 155 NORTH 400 WEST, LLC,
	a Delaware limited liability company
		
	By:	    	KBSIII REIT ACQUISITION V, LLC,
 a Delaware limited
liability company,
 its sole member

			
		    	By:	    	KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability
company,
 its sole member

				
		    		    	By:	    	KBS LIMITED PARTNERSHIP III,
 a Delaware limited
partnership,
 its sole member

					
		    		    		    	By:	    	KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland
corporation,
 its general partner

							
		    		    		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		    		    		    		    		  	Charles J. Schreiber, Jr.,	  	
		    		    		    		    		  	Chief Executive Officer	  	

  
 S-4

													
	KBSIII TOWER AT LAKE CAROLYN, LLC,
	a Delaware limited liability company
		
	By:	    	KBSIII REIT ACQUISITION VI, LLC,
 a Delaware limited
liability company,
 its sole member

			
		    	By:	    	KBS REIT PROPERTIES III, LLC,
 a Delaware limited liability
company,
 its sole member

				
		    		    	By:	    	KBS LIMITED PARTNERSHIP III,
 a Delaware limited
partnership,
 its sole member

					
		    		    		    	By:	    	KBS REAL ESTATE INVESTMENT TRUST III, INC.,
 a Maryland
corporation,
 its general partner

							
		    		    		    		    	By:	  	 /s/ Charles J. Schreiber, Jr.
	  	
		    		    		    		    		  	Charles J. Schreiber, Jr.,	  	
		    		    		    		    		  	Chief Executive Officer	  	

  
 S-5

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