**EXHIBIT 32.1**

**CERTIFICATIONPURSUANT TO18 U.S.C. SECTION 1350,AS ADOPTED PURSUANT TOSECTION 906 OF THE SARBANES-OXLEY ACT OF 2002**

In connection with the Quarterly Report on Form 10-Q of Mack-CaliRealty, L.P. (the “Operating Partnership”) for the quarterly period ended September30, 2006, as filed with the Securities and Exchange Commission on the datehereof (the “Report”), Mitchell E. Hersh, as President and Chief ExecutiveOfficer of Mack-Cali Realty Corporation, its general partner, and BarryLefkowitz, as Chief Financial Officer of Mack-Cali Realty Corporation, itsgeneral partner, each hereby certifies, pursuant to 18 U.S.C. §1350, asadopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fullycomplies with the requirements of Section 13(a) or 15(d) of the SecuritiesExchange Act of 1934; and

(2) The information contained in the Report fairlypresents, in all material respects, the financial condition and results ofoperations of the Operating Partnership.
| Date:       November 1, 2006  | By:      |   /s/ Mitchell E. Hersh                                                  |
|-------------------------------------------------------------|----------|------------------------------------------------------------------------------------|
|                                                        |     |   Mitchell E. Hersh                                                      |
|                                                        |     |   President and Chief Executive Officer                                  |
|                                                        |     | of Mack-Cali  Realty Corporation,                                                  |
|                                                        |     | the general  partner of Mack-Cali Realty, L.P.                                     |
|                                                        | * * | * *                                                                           |
| Date:       November  1, 2006 | By:      |   /s/ Barry Lefkowitz                                                    |
|                                                        |     |   Barry Lefkowitz                                                        |
|                                                        |     |   Executive Vice President and                                           |
|                                                        |     |     Chief Financial Officer                                    |
|                                                        |     |       of Mack-Cali  Realty Corporation,              |
|                                                        |     |       the general  partner of Mack-Cali Realty, L.P. |

 

Thiscertification accompanies each Report pursuant to § 906 of the Sarbanes-OxleyAct of 2002 and shall not, except to the extent required by the Sarbanes-OxleyAct of 2002, be deemed filed by the Operating Partnership for purposes of §18of the Securities Exchange Act of 1934, as amended.

Asigned original of this written statement required by § 906 has beenprovided to the Operating Partnership and will be retained by the OperatingPartnership and furnished to the Securities and Exchange Commission or itsstaff upon request.

----