Office Properties Income Trust (OPI) 10-Q 2017 Q3 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 September 30, 2017 (the “Report”), each of the undersigned hereby certifies, to the best of his knowledge:

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

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 M. Blackman
Barry M. Portnoy  Managing Trustee	David M. Blackman  President and Chief Operating Officer
/s/ Adam D. Portnoy	/s/ Mark L. Kleifges
Adam D. Portnoy  Managing Trustee	Mark L. Kleifges Chief Financial Officer and Treasurer

Date:    October 31, 2017