Document:

Exhibit 10.66

Exhibit 10.66 

SECOND AMENDMENT TO
AGREEMENT OF SALE AND
PURCHASE 

        THIS
SECOND AMENDMENT TO AGREEMENT OF SALE AND PURCHASE (this “Second
Amendment”) is entered into as of the 18th 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, as amended by that certain Amendment to Agreement           of Sale
and Purchase between Seller and Purchaser dated as of October 12,           2004 (as
amended to date, 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 20, 2004.  

        2.    Reaffirmation.  
Except as modified by this Second 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 Second Amendment           and the Purchase Agreement, the
terms of this Second Amendment shall control.  

        3.    Counterparts.  
This Second Amendment may be executed in any           number of counterparts, all of
which taken together will constitute one and the           same Second Amendment, and the
signature page of any counterpart may be removed           therefrom and attached to any
other counterpart. This Second 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]

        IN
WITNESS WHEREOF the parties have executed this Second 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/  Roger W. Thomas
      ———————————
      Name:  Roger W. Thomas

      Title:  Executive Vice President
                   and General Counsel

2Exhibit 10.67

Exhibit 10.67 

THIRD AMENDMENT TO
AGREEMENT OF SALE AND
PURCHASE 

        THIS
THIRD AMENDMENT TO AGREEMENT OF SALE AND PURCHASE (this “Third
Amendment”) is entered into as of the 20th 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, as amended by that certain Amendment to Agreement           of Sale
and Purchase between Seller and Purchaser dated as of October 12,           2004,
and as amended by that certain Second Amendment to Agreement of Sale and
          Purchase between Seller and Purchaser dated as of October 18, 2004 (as
          amended to date, 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 21, 2004.  

        2.    Reaffirmation.  
Except as modified by this Third 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 Third Amendment and           the Purchase Agreement, the terms
of this Third Amendment shall control.  

        3.    Counterparts.  
This Third Amendment may be executed in any           number of counterparts, all of
which taken together will constitute one and the           same Third Amendment, and the
signature page of any counterpart may be removed           therefrom and attached to any
other counterpart. This Third 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]

        IN
WITNESS WHEREOF the parties have executed this Third 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/  Roger W. Thomas
      ———————————
      Name:  Roger W. Thomas

      Title:  Executive Vice President
                   and General Counsel

2Exhibit 10.68

Exhibit 10.68 

FOURTH AMENDMENT TO
AGREEMENT OF SALE AND
PURCHASE 

        THIS
FOURTH AMENDMENT TO AGREEMENT OF SALE AND PURCHASE (this “Fourth
Amendment”) is entered into as of the 21st 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, as amended by that certain Amendment to Agreement           of Sale
and Purchase between Seller and Purchaser dated as of October 12,           2004, as
further amended by that certain Second Amendment to Agreement of Sale           and
Purchase between Seller and Purchaser dated as of October 18, 2004, and           as
further amended by that certain Third Amendment to Agreement of Sale and
          Purchase between Seller and Purchaser dated as of October 20, 2004 (as amended
          to date, 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 25, 2004.  

        2.    Reaffirmation.  
Except as modified by this Fourth 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 Fourth Amendment           and the Purchase Agreement, the
terms of this Fourth Amendment shall control.  

        3.    Counterparts.  
This Fourth Amendment may be executed in any           number of counterparts, all of
which taken together will constitute one and the           same Fourth Amendment, and the
signature page of any counterpart may be removed           therefrom and attached to any
other counterpart. This Fourth 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]

        IN
WITNESS WHEREOF the parties have executed this Fourth 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/  Roger W. Thomas
      ———————————
      Name:  Roger W. Thomas

      Title:  Executive Vice President
                   and General Counsel

2Exhibit 10.69

Exhibit 10.69 

FIFTH AMENDMENT TO
AGREEMENT OF SALE AND
PURCHASE 

        THIS
FIFTH AMENDMENT TO AGREEMENT OF SALE AND PURCHASE (this “Fifth
Amendment”) is entered into as of the 25th 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, as amended by that certain Amendment to Agreement           of Sale
and Purchase between Seller and Purchaser dated as of October 12,           2004, as
further amended by that certain Second Amendment to Agreement of Sale           and
Purchase between Seller and Purchaser dated as of October 18, 2004, as
          further amended by that certain Third Amendment to Agreement of Sale and
          Purchase between Seller and Purchaser dated as of October 20, 2004, and as
          further amended by that certain Fourth Amendment to Agreement of Sale and
          Purchase between Seller and Purchaser dated as of October 21, 2004 (as
          amended to date, 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 27, 2004.  

        2.    Reaffirmation.  
Except as modified by this Fifth 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 Fifth Amendment and           the Purchase Agreement, the terms
of this Fifth Amendment shall control.  

        3.    Counterparts.  
This Fifth Amendment may be executed in any           number of counterparts, all of
which taken together will constitute one and the           same Fifth Amendment, and the
signature page of any counterpart may be removed           therefrom and attached to any
other counterpart. This Fifth 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]

        IN
WITNESS WHEREOF the parties have executed this Fifth 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/  Roger W. Thomas
      ———————————
      Name:  Roger W. Thomas

      Title:  Executive Vice President
                   and General Counsel

2

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