Document:

3rd Amend. to Purchase and Sale Agreement. Dated as of July 20, 2006.

 Exhibit 10.18 
 THIRD AMENDMENT TO 
 PURCHASE AND SALE AGREEMENT 
 THIS THIRD AMENDMENT TO PURCHASE AND SALE AGREEMENT (this “Amendment”) dated as of July 20, 2006, is entered into by and between
KBS CAPITAL ADVISORS LLC, a Delaware limited liability company (“Buyer”), and THF PLAZA OFFICE, L.L.C., a Missouri limited liability company (“Seller”), with reference to the following recitals: 
 RECITALS 
 A. Seller and Buyer
are parties to that certain Purchase and Sale Agreement, dated May 2, 2006, as amended by that certain First Amendment to Purchase and Sale Agreement, dated June 14, 2006, and as further amended by that certain Second Amendment to Purchase
and Sale Agreement dated July 6, 2006 (as amended, the “Purchase Agreement”). All initially-capitalized terms not otherwise defined herein shall have the meanings set forth in the Purchase Agreement unless the context clearly
indicates otherwise. 
 B. Seller and Buyer mutually desire to amend the Purchase Agreement as provided below. 
 NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows: 
 AGREEMENT 
 1. Extension of Due Diligence Period. The Due Diligence Period shall be, and hereby is, extended to and shall expire on July 31, 2006 at 5:00 p.m. Central Time. 
 2. No Other Amendments; This Amendment Governs and Controls. Except as expressly modified hereby, the Purchase Agreement shall remain
unmodified and in full force and effect. To the extent any of the provisions of this Amendment are inconsistent with any of the provisions set forth in the Purchase Agreement, the provisions of this Amendment shall govern and control. 
 3. Counterparts. This Amendment may be executed in any number of counterparts, each of which shall be deemed an original, but all of which
when taken together shall constitute one and the same instrument. Each counterpart may be delivered by facsimile transmission. The signature page of any counterpart may be detached therefrom without impairing the legal effect of the signature(s)
thereon provided such signature page is attached to any other counterpart identical thereto. 
 [SIGNATURES ON NEXT PAGE] 
  

					
		 	1	 	

 IN WITNESS WHEREOF, Buyer and Seller have executed this Amendment as of the day and year first above
written. 
 BUYER: 
  

			
	 KBS CAPITAL ADVISORS LLC,
 a Delaware limited
liability company

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

	Name:	 	Charles J. Schreiber, Jr.
	Title:	 	Manager

  

					
		 	S-1	 	

 SELLER: 
  

							
	 THF PLAZA OFFICE, L.L.C.,
 a Missouri
limited liability company

		
	By:	 	 THF Carondelet Development, L.L.C.,
 its
sole member

			
		 	By:	 	 THF Carondelet Investors, L.L.C.,
 its
Manager

				
		 		 	By:	 	 /s/ Authorized Signatory

  

					
		 	S-24th Amend. to Purchase and Sale Agreement. Dated as of July 31, 2006.

 Exhibit 10.19 
 FOURTH AMENDMENT TO 
 PURCHASE AND SALE AGREEMENT 
 THIS FOURTH AMENDMENT `TO PURCHASE AND SALE AGREEMENT (this “Amendment”) dated as of July 31, 2006, is entered into by and between
KBS CAPITAL ADVISORS LLC, a Delaware limited liability company (“Buyer”), and THF PLAZA OFFICE, L.L.C., a Missouri limited liability company (“Seller”), with reference to the following recitals:

 RECITALS 
 A.
Seller and Buyer are parties to that certain Purchase and Sale Agreement, dated May 2, 2006, as amended by that certain First Amendment to Purchase and Sale Agreement, dated June 14, 2006, as further amended by that certain Second
Amendment to Purchase and Sale Agreement dated July 6, 2006 (the “Second Amendment”), and as further amended by that certain Third Amendment to Purchase and Sale Agreement dated July 20, 2006 (as amended, the
“Purchase Agreement”). All initially-capitalized terms not otherwise defined herein shall have the meanings set forth in the Purchase Agreement unless the context clearly indicates otherwise. 
 B. Seller and Buyer mutually desire to amend the Purchase Agreement as provided below. 
 NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows: 
 AGREEMENT 
 1. Extension of Due Diligence Period. The Due Diligence Period shall be, and hereby is, extended to and shall expire on August 21, 2006 at 5:00 p.m. Central Time. 
 2. Extension of Closing Date. The Closing Date shall be, and hereby is, extended to and shall occur on September 12, 2006. 

3. Right to Extend Closing Date. Buyer shall have the right, in its sole discretion, to extend the Closing Date to no later than
October 12, 2006, by providing Seller with written notice of such election by no later than September 7, 2006, at 5:00 p.m. Central Time. Paragraph 2 of the Second Amendment is hereby void and shall be no further force or effect.

 4. No Other Amendments; This Amendment Governs and Controls. Except as expressly modified hereby, the Purchase Agreement
shall remain unmodified and in full force and effect. To the extent any of the provisions of this Amendment are inconsistent with any of the provisions set forth in the Purchase Agreement, the provisions of this Amendment shall govern and control.

 5. Counterparts. This Amendment may be executed in any number of counterparts, each of which shall be deemed an original,
but all of which when taken together shall constitute one and the same instrument. Each counterpart may be delivered by facsimile transmission. The signature page of any counterpart may be detached therefrom without impairing the legal effect of the
signature(s) thereon provided such signature page is attached to any other counterpart identical thereto. 
 [SIGNATURES ON NEXT PAGE]

  

					
		 	1	 	

 IN WITNESS WHEREOF, Buyer and Seller have executed this Amendment as of the day and year first above
written. 
 BUYER: 
  

			
	 KBS CAPITAL ADVISORS LLC,
 a Delaware limited
liability company

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

	Name:	 	Charles J. Schreiber, Jr.
	Title:	 	Manager

  

					
		 	S-1	 	

 SELLER: 
  

							
	 THF PLAZA OFFICE, L.L.C.,
 a Missouri
limited liability company

		
	By:	 	THF Carondelet Development, L.L.C.,
its sole member
			
		 	By:	 	THF Carondelet Investors, L.L.C.,
its Manager
				
		 		 	By:	 	 /s/ Authorized Signatory

  

					
		 	S-2Assignment and Assumption of Purchase Agreement. Dated as of August 11, 2006.

 Exhibit 10.20 
 ASSIGNMENT AND ASSUMPTION OF PURCHASE AGREEMENT 
 This Assignment and Assumption of Purchase
Agreement (“Assignment”) is entered into between KBS CAPITAL ADVISORS LLC, a Delaware limited liability company (“Assignor”) and KBS CLAYTON PLAZA, LLC, a Delaware limited liability company (“Assignee”), as of
August 11, 2006 (“Effective Date”). 
 RECITALS 
 A. Pursuant to the terms of that certain Purchase and Sale Agreement effective as of May 2, 2006, by and between THF PLAZA OFFICE, L.L.C., a
Missouri limited liability company, as seller, and Assignor, as buyer (as amended, the “Purchase Agreement”), Assignor agreed to acquire the Property (as such term is defined in the Purchase Agreement) commonly referred to as The Plaza in
Clayton. 
 B. Assignor desires to assign, without recourse, representation or warranty, all of its rights, benefits, liabilities and
obligations arising under the Purchase Agreement (and related documents) to Assignee, and Assignee desires to assume all of said rights, benefits, liabilities and obligations. 
 NOW, THEREFORE, in consideration of the foregoing promises, the mutual undertakings of the parties set forth herein and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged by the parties, the parties agree as follows: 
 1.
Recitals. The above recitals are incorporated herein by reference. 
 2. Assignment and Assumption. Assignor hereby transfers,
assigns and conveys, without recourse, representation or warranty, express or implied, all of Assignor’s rights, interests, liabilities and obligations in and to the Property, and all of Assignor’s rights, interests, liabilities and
obligations under the Purchase Agreement (and related documents) to acquire same to Assignee. Assignee hereby assumes all such rights, interests, liabilities and obligations, and joins in all representations, warranties, releases, and indemnities,
of Assignor under the Purchase Agreement (and related documents) relating to such Property and the Purchase Agreement (and related documents) assigned to it above. 
 3. Successors and Assigns. This Assignment shall be binding upon and inure to the benefit of the parties’ successors and assigns. 
 4. Attorneys’ Fees. In the event any party institutes any action or proceeding against the other party with regard to this Assignment, the
prevailing party of such action shall be entitled to recover from the nonprevailing party (in addition to all other remedies provided by law) its attorneys’ fees and costs incurred in such action or proceeding. 
 5. Counterparts. This Assignment may be executed in any number of counterparts, each of which shall be deemed an original, but all of which when
taken together shall constitute one and the same instrument. Each counterpart may be delivered by facsimile transmission. The signature page of any counterpart may be detached therefrom without impairing the legal effect of the signature(s) thereon
provided such signature page is attached to any other counterpart identical thereto. 
 [SIGNATURES ON FOLLOWING PAGES] 
  

					
		 	1	 	

 Executed as of the date set forth above. 
 ASSIGNOR: 
  

			
	 KBS CAPITAL ADVISORS LLC,
 a Delaware limited
liability company

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

		 	Charles J. Schreiber, Jr.
		 	Chief Executive Officer

  

					
		 	S-1	 	

 ASSIGNEE: 
  

									
	 KBS CLAYTON PLAZA, LLC,
 a Delaware limited
liability company

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

			
		 	By:	 	 KBS Limited Partnership,
 a Delaware limited
partnership, its sole member

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

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

		 		 		 		 	Charles J. Schreiber, Jr.
		 		 		 		 	Chief Executive Officer

  

					
		 	S-2

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