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Real Estate Transactions
9 Months Ended
Sep. 30, 2015
Real Estate Transactions [Abstract]  
Real Estate Disclosure [Text Block]
Acquisitions
    
In July 2015, the Company acquired a 4.16 acre land site located in Atlanta, Georgia for $27.0 million. An approximately 485,000 square foot office building is expected to be developed on this site. The site also includes an additional parcel for a second office building development.

Dispositions

In September 2015, the Company sold 2100 Ross, an 844,000 square foot office tower located in Dallas, Texas for a gross sales price of $131.0 million and recognized a gain of $36.2 million on this disposition.