SECOND AMENDMENT TO PURCHASE AND SALE AGREEMENT

Exhibit 10.8

SECOND AMENDMENT TO PURCHASE AND SALE AGREEMENT

     THIS SECOND AMENDMENT TO PURCHASE AND SALE AGREEMENT (“Amendment”) is entered into as of the 31st day of August, 2005 (the “Effective Date”) by and between Xxxxxxx Xxxxx Associates, L.P. (“Seller”) and Columbia Equity Trust, Inc. (“Purchaser”).

RECITALS

     A. Seller and Purchaser entered into a Purchase and Sale Agreement dated as of August 5, 2005, as amended (collectively, the “Contract”), pursuant to which Seller agreed to sell to Purchaser, and Purchaser agreed to buy from Seller the Property (as defined in the Contract).

     B. Seller and Purchaser have agreed to modify the terms of the Contract as set forth in this Amendment.

     C. All capitalized terms not otherwise defined herein shall have the meanings ascribed to them in the Contract.

     NOW THEREFORE, for valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound, Seller and Purchaser agree as follows:

AGREEMENTS

     1. The Outside Date is hereby extended to October 15, 2005. In the event Lender Approval is not received on or before the Outside Date, either party on written notice to the other shall have the right to extend the Outside Date to October 31, 2005.

     2. Except as modified by this Amendment, all of the terms of the Contract shall remain unchanged and in full force and effect.

     3. This Amendment may be executed in counterparts all of which together shall constitute one and the same instrument.

            IN WITNESS WHEREOF, Seller and Purchaser have entered into this Amendment as of the date first above stated.

		SELLER:
		XXXXXXX XXXXX ASSOCIATES L.P.
		By:		SAP IV Xxxxxxx Xxxxx NF GP L.L.C.,
				its sole general partner
				By:		SAP IV manager, Inc.,
						its manager
		By:	/s/ Xxxxxx Xxxxxxx
		Its:	Executive Vice President
		PURCHASER:
		COLUMBIA EQUITY TRUST, INC., a Maryland corporation
		By:	/s/ Xxxxxxx Xxxxx
		Its:	Director of Acquisitions