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Investment in Real Estate (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Real Estate [Abstract]      
Land $ 1,313,412,000   $ 1,313,412,000
Building and improvements 5,227,848,000   5,189,342,000
Tenant improvements 641,568,000   631,459,000
Furniture and fixtures 11,133,000   10,693,000
Property under development 153,102,000   124,222,000
Investment in real estate, at cost 7,347,063,000   $ 7,269,128,000
Impairment loss $ 0 $ 52,201,000