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Segment Information	12 Months Ended
Segment Information	Dec. 31, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Our primary business is the ownership and operation of office properties, and we currently have one reportable segment. More than 90% of our revenues for the year ended December 31, 2018 are from office properties. For the year ended December 31, 2018, Expedia, Inc. individually accounted for 10.3% of our consolidated revenues.