Annual report pursuant to Section 13 and 15(d)

Real Estate - Properties Sold and Held for Sale (Details)

v3.19.3.a.u2
Real Estate - Properties Sold and Held for Sale (Details)
ft² in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 19, 2019
USD ($)
ft²
Aug. 27, 2019
USD ($)
ft²
Aug. 21, 2019
USD ($)
ft²
Jul. 23, 2019
USD ($)
ft²
Jun. 26, 2019
USD ($)
ft²
Jun. 28, 2018
USD ($)
ft²
Jan. 19, 2018
USD ($)
ft²
Oct. 23, 2017
USD ($)
apartment
Dec. 31, 2019
USD ($)
ft²
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
ft²
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
apartment
Apr. 22, 2019
USD ($)
Mar. 31, 2019
ft²
Mar. 31, 2018
USD ($)
ft²
Properties Sold [Line Items]                                    
(Loss) gain on sale                 $ 61,000   $ (1,000) $ 2,500 $ 59,961 $ 2,495 $ 24,915      
(Loss) gain on sale                   $ 339,000     $ 339,024 $ 0 0      
2019 Properties                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²                 2,407       2,407          
Contract sales price                 $ 792,100       $ 792,100          
(Loss) gain on sale                         398,985          
2019 Properties | Disposal group, not discontinued operations                                    
Properties Sold [Line Items]                                    
(Loss) gain on sale                         $ 398,985          
2019 Properties | Disposal group, not discontinued operations | Quantico Corporate Center | Office                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²         272                       272  
Contract sales price         $ 33,000                     $ 33,000    
(Loss) gain on sale         $ (1,046)                          
2019 Properties | Disposal group, not discontinued operations | Shopping Center Portfolio                                    
Properties Sold [Line Items]                                    
(Loss) gain on sale       $ 333,000                            
2019 Properties | Disposal group, not discontinued operations | Frederick Crossing and Frederick County Square                                    
Properties Sold [Line Items]                                    
(Loss) gain on sale     $ 9,500                              
2019 Properties | Disposal group, not discontinued operations | Centre at Hagerstown                                    
Properties Sold [Line Items]                                    
(Loss) gain on sale   $ 3,500                                
2019 Properties | Disposal group, not discontinued operations | 1776 G Street | Office                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft² 262                                  
Contract sales price $ 129,500                                  
(Loss) gain on sale $ 61,007                                  
2019 Properties | Held for sale | John Marshall II | Office                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²                 223       223          
Contract sales price                 $ 63,350       $ 63,350          
2019 Properties | Discontinued operations | Shopping Center Portfolio | Retail                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²       800                            
Contract sales price       $ 485,250                            
(Loss) gain on sale       $ 333,023                            
2019 Properties | Discontinued operations | Frederick Crossing and Frederick County Square | Retail                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²     520                              
Contract sales price     $ 57,500                              
(Loss) gain on sale     $ 9,507                              
2019 Properties | Discontinued operations | Centre at Hagerstown | Retail                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²   330                                
Contract sales price   $ 23,500                                
(Loss) gain on sale   $ (3,506)                                
2018 Properties                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²                           648        
Contract sales price                           $ 194,600        
(Loss) gain on sale                           2,495        
2018 Properties | Disposal group, not discontinued operations                                    
Properties Sold [Line Items]                                    
(Loss) gain on sale                           $ 2,495        
2018 Properties | Disposal group, not discontinued operations | Braddock Metro Center | Office                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²             356                      
Contract sales price             $ 93,000                      
(Loss) gain on sale             $ 0                      
2018 Properties | Disposal group, not discontinued operations | 2445 M Street | Office                                    
Properties Sold [Line Items]                                    
Rentable square feet (sq ft) | ft²           292                       292
Contract sales price           $ 101,600           $ 101,600           $ 100,000
(Loss) gain on sale           $ 2,495                        
2017 Properties                                    
Properties Sold [Line Items]                                    
Contract sales price                             32,200      
(Loss) gain on sale                             23,838      
2017 Properties | Disposal group, not discontinued operations                                    
Properties Sold [Line Items]                                    
(Loss) gain on sale                             $ 23,838      
2017 Properties | Disposal group, not discontinued operations | Walker House Apartments | Multifamily                                    
Properties Sold [Line Items]                                    
Number of units | apartment               212             212      
Contract sales price               $ 32,200             $ 32,200      
(Loss) gain on sale               $ 23,838             $ 23,800