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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event In July 2019, we sold 1600 K Street, an 83,000 square foot commercial property located in Washington D.C., for $43.0 million, which had a net carrying value of $32.9 million and did not meet the held for sale criteria as of June 30, 2019. In August 2019, our Board of Trustees declared a quarterly dividend of $0.225 per common share, payable on August 26, 2019 to shareholders of record on August 13, 2019.