Office Properties Income Trust (OPI) 10-Q 2015 Q2 Quarterly report

EXHIBIT 32.1

Certification Pursuant to 18 U.S.C. Sec. 1350

In connection with the filing by Government Properties Income Trust (the “Company”) of the Quarterly Report on Form 10-Q for the period ended June 30, 2015 (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/ Adam D. Portnoy
Barry M. Portnoy  Managing Trustee	Adam D. Portnoy Managing Trustee
/s/ David M. Blackman	/s/ Mark L. Kleifges
David M. Blackman  President and Chief Operating Officer	Mark L. Kleifges Treasurer and Chief Financial Officer

Date:    July 31, 2015