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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 12, 2017, we announced that our Board of Trustees declared a dividend of $0.40625 per series D preferred share, which was paid on February 15, 2017 to shareholders of record on January 30, 2017. On January 31, 2017, we sold 111 Market Place (one building), with 589,380 square feet for $60.1 million. In February 2017, we purchased $100.0 million of 2-year United States Treasury Notes with a coupon rate of 1.125% and a weighted average yield of 1.227%.