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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In October 2018, we sold 1233 20th Street and the out-of-service portion of Falkland Chase-North. See Note 3 for additional information. In November 2018, our Board of Trustees declared a quarterly dividend of $0.225 per common share, payable on November 26, 2018 to shareholders of record on November 13, 2018.