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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On May 1, 2014, we closed on the purchase of 1775 Eye Street, a 185,000 office building in Washington, DC, for $104.5 million, using proceeds from the Medical Office Portfolio sale. The initial accounting for the acquisition is incomplete due to the timing of the acquisition relative to the filing date of this report and, therefore, purchase price accounting and pro forma disclosures are not included.