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Real Estate Properties - Schedule of Joint Ventures (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
ft²
property
joint_venture
Dec. 31, 2020
USD ($)
Real Estate [Line Items]    
Number of joint ventures | joint_venture 2  
Rentable Square Feet (in square feet) | ft² 877,000  
Unconsolidated Joint Ventures    
Real Estate [Line Items]    
Number of Properties | property 3  
Investment at carrying value $ 36,669 $ 37,951
Rentable Square Feet (in square feet) | ft² 444,000  
Unamortized basis difference $ 7,220  
Unconsolidated Joint Ventures | Prosperity Metro Plaza    
Real Estate [Line Items]    
Number of Properties | property 2  
Ownership percentage 51.00%  
Investment at carrying value $ 21,431 21,888
Rentable Square Feet (in square feet) | ft² 329,000  
Unconsolidated Joint Ventures | 1750 H Street, NW    
Real Estate [Line Items]    
Number of Properties | property 1  
Ownership percentage 50.00%  
Investment at carrying value $ 15,238 $ 16,063
Rentable Square Feet (in square feet) | ft² 115,000  
Mortgages | Unconsolidated Joint Ventures    
Real Estate [Line Items]    
Interest rate (as a percent) 3.93%  
Principal balance $ 82,000  
Mortgages | Unconsolidated Joint Ventures | Prosperity Metro Plaza    
Real Estate [Line Items]    
Interest rate (as a percent) 4.09%  
Principal balance $ 50,000  
Mortgages | Unconsolidated Joint Ventures | 1750 H Street, NW    
Real Estate [Line Items]    
Interest rate (as a percent) 3.69%  
Principal balance $ 32,000