Exhibit 99.2

December 29, 2006

Abrams Office Center, Ltd.
c/o Millennium Office Management, Inc.
10440 N. Central Expressway, Suite 1150
Dallas, TX 75231
Attn: Jonathan Azoulay
Attn: Abraham Azoulay

Re:     Abrams Centre — Extension of Review Period

Dear Messrs. Azoulay:

     This letter relates to that certain Purchase and Sale Agreement dated effective as of October 24, 2006, as amended by letter agreements dated December 8, 2006 and December 15, 2006 (the “Purchase Agreement”), whereby Abrams Office Center, Ltd., a Texas limited partnership (“AOC”), as seller, agreed to sell to GERA Property Acquisition LLC, a Delaware limited liability company (“GERA”), as purchaser, that certain property commonly known as the “Abrams Centre” located at 9330 LBJ Freeway, Dallas, Texas (the “Property”). Capitalized terms used herein but not defined shall have the meanings ascribed to such terms in the Purchase Agreement.

     The purpose of this letter is to amend the Purchase Agreement in order to extend the Review Period. AOC and GERA hereby agree that the expiration date of the Review Period is hereby extended from December 29, 2006, to January 4, 2007. Except as amended hereby, the parties agree that the Purchase Agreement remains in full force and effect and is hereby ratified and confirmed in all respects.

     Please execute below to acknowledge AOC’s agreement to the terms and conditions of this letter agreement, and return the fully executed letter to GERA at the address listed above.

Yours Truly, GERA PROPERTY ACQUISITION LLC, Delaware limited liability company
By:	/s/ Mark W. Chrisman
	Mark W. Chrisman
	Executive Vice President

THE UNDERSIGNED HAS THE AUTHORITY TO EXECUTE THIS LETTER AGREEMENT ON BEHALF OF AOC AND ACKNOWLEDGES AND AGREES TO THE TERMS AND CONDITIONS OF THIS LETTER AGREEMENT:

ABRAMS OFFICE CENTER, LTD.,
a Texas limited partnership

By:	Synerplex Properties, L.L.C., a Texas limited liability company
Its:	sole general partner
	By:	Jonathon Azoulay
	Name:	Manager
	Its:
cc:	James H. Wallenstein Robert Slaughter James L. Beard

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