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Investment in Real Estate (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Real Estate [Abstract]    
Land $ 1,351,888 $ 1,351,888
Building and improvements 5,948,317 5,840,819
Tenant improvements 742,968 728,111
Furniture and fixtures 12,881 12,250
Property under development 325,017 281,949
INVESTMENT IN REAL ESTATE, AT COST $ 8,381,071 $ 8,215,017