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Investment in Real Estate (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Real Estate [Abstract]    
Land $ 1,351,888 $ 1,313,412
Building and improvements 5,840,819 5,189,342
Tenant improvements 728,111 631,459
Furniture and fixtures 12,250 10,693
Property under development 281,949 124,222
INVESTMENT IN REAL ESTATE, AT COST $ 8,215,017 $ 7,269,128