Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Summary of Properties Sold (Details)

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Real Estate - Summary of Properties Sold (Details) - 2020 Properties
ft² in Thousands, $ in Thousands
12 Months Ended
Dec. 17, 2020
USD ($)
ft²
Dec. 02, 2020
USD ($)
ft²
Apr. 21, 2020
USD ($)
ft²
Dec. 31, 2020
USD ($)
ft²
Properties Sold and Held for Sale [Line Items]        
Rentable Square Feet (sq ft) | ft²       565
Contract Sales Price       $ 163,500
(Loss) gain on sale       $ (14,325)
Disposal group | John Marshall II | Office        
Properties Sold and Held for Sale [Line Items]        
Rentable Square Feet (sq ft) | ft²     223  
Contract Sales Price     $ 57,000  
(Loss) gain on sale     $ (6,855)  
Disposal group | Monument II | Office        
Properties Sold and Held for Sale [Line Items]        
Rentable Square Feet (sq ft) | ft²   207    
Contract Sales Price   $ 53,000    
(Loss) gain on sale   $ (8,595)    
Disposal group | 1227 25th Street | Office        
Properties Sold and Held for Sale [Line Items]        
Rentable Square Feet (sq ft) | ft² 135      
Contract Sales Price $ 53,500      
(Loss) gain on sale $ 1,125