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Investment in Real Estate (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Real Estate [Abstract]    
Land $ 1,351,888 $ 1,351,888
Building and improvements 6,008,111 5,840,819
Tenant improvements 751,657 728,111
Furniture and fixtures 14,029 12,250
Property under development 320,806 281,949
INVESTMENT IN REAL ESTATE, AT COST $ 8,446,491 $ 8,215,017