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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 10, 2020, we announced that our Board of Trustees declared a dividend of $0.40625 per series D preferred share, which will be paid on February 18, 2020 to shareholders of record on January 30, 2020. On February 12, 2020, we sold our 0.3 million square foot property at 109 Brookline Avenue for a gross sale price of $270.0 million. On February 12, 2020, we entered into a contract to sell our 0.4 million square foot property at 333 108th Avenue NE for a gross sale price of $401.5 million. This transaction is subject to customary closing extensions and conditions, and there is no certainty that this transaction will close.