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Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company and its subsidiaries are, from time to time, parties to litigation arising from the ordinary course of business. The Company does not believe that any such litigation will materially affect its financial position or operations. In connection with the Company's December 19, 2013 merger transactions with Thomas Properties Group, Inc., the Company acquired a 1% limited partnership interest in 2121 Market Street. A mortgage loan secured by a first trust deed on 2121 Market Street is guaranteed by the Company up to a maximum amount of $14.0 million expiring in December 2022. At June 30, 2016, the Company had future obligations under leases to fund tenant improvements and leasing commissions of $38.8 million and $1.4 million, respectively.