EXHIBIT 1





                                    AGREEMENT


         Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement  containing the information
required  by  Schedule  13D (or any  amendment  thereof)  need be filed on their
behalf with respect to the beneficial ownership of any equity securities of Five
Star Quality  Care,  Inc.  ("Five  Star"),  or any  subsequent  acquisitions  or
dispositions of equity securities of Five Star by either of the undersigned.


Dated:  December 21, 2001           HRPT PROPERTIES TRUST



                                    By: /s/ John A. Mannix
                                        John A. Mannix, President



                                    REIT MANAGEMENT & RESEARCH LLC



                                    By: /s/ David J. Hegarty
                                        David J. Hegarty, President


                                    REIT MANAGEMENT & RESEARCH TRUST



                                    By: /s/ David J. Hegarty
                                        David J. Hegarty, President