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 Senior Housing Properties Trust (the “Company”) of the Quarterly Report on Form 10-Q for the period ending March 31, 2003 (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) or 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/ David J. Hegarty
Barry M. Portnoy	David J. Hegarty
Managing Trustee	President and Chief Operating Officer
/s/ Gerard M. Martin	/s/ John R. Hoadley
Gerard M. Martin	John R. Hoadley
Managing Trustee	Treasurer and Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to Senior Housing Properties Trust and will be retained by Senior Housing Properties Trust and furnished to the Securities and Exchange Commission or its staff upon request.