RECKSON OPERATING PARTNERSHIP, L.P.
                                  EXHIBIT 32.1
  CERTIFICATION OF SCOTT H. RECHLER, CHIEF EXECUTIVE OFFICER AND PRESIDENT OF
  RECKSON ASSOCIATES REALTY CORP., THE SOLE GENERAL PARTNER OF THE REGISTRANT,
  PURSUANT TO SECTION 1350 OF CHAPTER 63 OF TITLE 18 OF THE UNITED STATES CODE


I, Scott H. Rechler, Chief Executive Officer and President of Reckson Associates
Realty Corp., the sole general partner of Reckson  Operating  Partnership,  L.P.
(the "Company"),  certify pursuant to Section 906 of the  Sarbanes-Oxley  Act of
2002, 18 U.S.C. Section 1350, that:

      1)    The  Quarterly  Report on Form 10-Q of the Company for the quarterly
            period ended June 30, 2004 (the  "Report")  fully  complies with the
            requirements  of Section 13(a) or 15(d) of the  Securities  Exchange
            Act of 1934 (15 U.S.C. 78m or 78o(d)); and

      2)    The  information  contained in the Report  fairly  presents,  in all
            material respects, the financial condition and results of operations
            of the Company.


Dated: August 9, 2004
                         By             /s/ Scott H. Rechler
                           -----------------------------------------------------
                           Scott H. Rechler,  Chief Executive  Officer and
                           President of Reckson  Associates Realty Corp.,
                           the sole general partner of the Registrant


A signed  original of this  written  statement  required by Section 906 has been
provided to Reckson  Operating  Partnership,  L.P.  and will be furnished to the
Securities and Exchange Commission or its staff upon request.