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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 12, 2018, we announced that our Board of Trustees declared a dividend of $0.40625 per series D preferred share, which will be paid on February 15, 2018 to shareholders of record on January 30, 2018. On January 22, 2018, we entered into a contract to sell our 1,561,477 square foot property at 600 West Chicago Avenue, for a sales price of $510.0 million, excluding closing credits and closing costs. This transaction is subject to customary closing extensions and conditions, and there is no certainty that this transaction will close. On January 30, 2018, we delivered notice of our intent to redeem at par our $175 million 5.75% senior unsecured notes due 2042 on March 7, 2018. The notes will be redeemed for cash at a price equal to 100% of the principal amount of the notes plus any accrued and unpaid interest up to, but excluding, the redemption date (see Note 8). On February 14, 2018, we sold 1600 Market Street, a 825,968 square foot property, for a sales price of $160.0 million, excluding closing credits and closing costs. This property was classified as held for sale as of December 31, 2017 (see Note 3).