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Organization and Basis of Presentation - Subsequent Events (Details)
$ in Millions
May 07, 2020
USD ($)
ft²
Mar. 31, 2020
ft²
Subsequent Event [Line Items]    
Approximate Square Feet | ft²   29,864,846
609 Fifth Avenue | Subsequent Event    
Subsequent Event [Line Items]    
Sales Price $ 168.0  
National Pension Service of Korea And Hines Interest LP | One Madison Ave | Subsequent Event    
Subsequent Event [Line Items]    
Ownership percentage in disposed asset 49.50%  
Committed aggregate equity to the project $ 492.2  
Co-venturer | National Pension Service of Korea And Hines Interest LP | One Madison Ave | Subsequent Event    
Subsequent Event [Line Items]    
Project value $ 2,300.0  
Approximate Square Feet | ft² 1,400,000