Exhibit 10.65

AMENDMENT TO
AGREEMENT OF SALE AND PURCHASE

        THIS AMENDMENT TO AGREEMENT OF SALE AND PURCHASE (this “Amendment”) is
entered into as of the 12th day of October, 2004, by and between MACK-CALI TEXAS
PROPERTY L.P., a Texas limited partnership (“Seller”), and CENTENNIAL
ACQUISITION COMPANY, a Texas corporation, and WARAMAUG ACQUISITION CORP., a
Texas corporation (collectively, “Purchaser”).

        A.             Seller and Purchaser entered into that certain Agreement
of Sale and Purchase dated as of August 10, 2004 (the “Purchase Agreement”). All
capitalized terms used but not defined herein shall have the meaning given such
terms in the Purchase Agreement.

        B.     Seller and Purchaser now desire to amend the Purchase Agreement
as set forth below.

        NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, Seller and Purchaser agree as
follows:

        1.    Evaluation Period.   The expiration of the Evaluation Period is
hereby extended to 5:00 p.m. Eastern Time on October 18, 2004.

        2.    Purchase Price.   The Purchase Price is hereby reduced to
Forty-One Million Four Hundred Fifty Thousand and No/100 Dollars
($41,450,000.00).

        3.    Reaffirmation.   Except as modified by this Amendment, the
Purchase Agreement is hereby ratified and confirmed and in full force and
effect. In the event of a conflict between the terms of this Amendment and the
Purchase Agreement, the terms of this Amendment shall control.

        4.    Counterparts.   This Amendment may be executed in any number of
counterparts, all of which taken together will constitute one and the same
Amendment, and the signature page of any counterpart may be removed therefrom
and attached to any other counterpart. This Amendment shall be legally binding
upon receipt by each party of the facsimile or the original signature of Seller
and of Purchaser.

      [SIGNATURES FOLLOW ON NEXT SUCCEEDING PAGE]

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        IN WITNESS WHEREOF the parties have executed this Amendment as of the
day and year first above written.

PURCHASER:

CENTENNIAL ACQUISITION COMPANY

By:  /s/ Steven H. Levin
——————————————
Name:  Steven H. Levin
Title:  President

WARAMAUG ACQUISITION CORP.

By:  /s/  Cindy Nelson
——————————————
Name:  Cindy Nelson
Title:  Vice President

SELLER:

MACK-CALI TEXAS PROPERTY L.P.

By:  Mack-Cali Sub XVII, Inc., its general partner

      By:  /s/  Barry Lefkowitz
      ———————————
      Name:  Barry Lefkowitz
      Title:  Executive Vice President
                   and Chief Financial Officer

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