Exhibit 99.1


                  Certification Required by 18 U.S.C. Sec. 1350
                (Section 906 of the Sarbanes - Oxley Act of 2002)
                ------------------------------------------------



         In connection with the filing by HRPT Properties  Trust (the "Company")
of the Quarterly  Report on Form 10-Q for the period  ending  September 30, 2002
(the "Report"),  each of the undersigned  hereby  certifies,  to the best of his
knowledge:

                  1)       The Report fully  complies with the  requirements  of
                           Section  13(a) and 15(d) of the  Securities  Exchange
                           Act of 1934, and

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




/s/Barry M. Portnoy                             /s/John A. Mannix
- --------------------                            ------------------
Barry M. Portnoy                                John A. Mannix
Managing Trustee                                President and Chief
                                                Operating Officer


/s/Gerard M. Martin                             /s/John C. Popeo
- -------------------                             ----------------
Gerard M. Martin                                John C. Popeo
Managing Trustee                                Treasurer and Chief
                                                Financial Officer