Annual report pursuant to Section 13 and 15(d)

Real Estate - Acquisitions (Details)

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Real Estate - Acquisitions (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Jul. 23, 2019
USD ($)
unit
Jun. 27, 2019
USD ($)
unit
Apr. 30, 2019
USD ($)
unit
Jan. 18, 2018
USD ($)
Apr. 04, 2017
USD ($)
Dec. 31, 2019
USD ($)
ft²
unit
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Real Estate [Line Items]                
Rentable Square Feet (sq ft) | ft² [1]           9,726    
Contract Purchase Price             $ 250,000 $ 135,000
Multifamily                
Real Estate [Line Items]                
Rentable Square Feet (sq ft) | ft²           5,804    
Multifamily | 2019 Acquisitions                
Real Estate [Line Items]                
Number of units | unit           2,390    
Contract Purchase Price           $ 530,920    
Multifamily | 2019 Acquisitions | Assembly Portfolio - Virginia                
Real Estate [Line Items]                
Number of units | unit     1,685          
Contract Purchase Price     $ 379,100          
Multifamily | 2019 Acquisitions | Assembly Portfolio - Maryland                
Real Estate [Line Items]                
Number of units | unit   428            
Contract Purchase Price   $ 82,070            
Multifamily | 2019 Acquisitions | Cascade at Landmark                
Real Estate [Line Items]                
Number of units | unit 277              
Contract Purchase Price $ 69,750              
Office                
Real Estate [Line Items]                
Rentable Square Feet (sq ft) | ft²           3,227    
Office | 2018 Acquisitions | Arlington Tower                
Real Estate [Line Items]                
Rentable Square Feet (sq ft) | ft²           391    
Contract Purchase Price       $ 250,000        
Office | 2017 Acquisitions | Watergate 600                
Real Estate [Line Items]                
Rentable Square Feet (sq ft) | ft²           293    
Contract Purchase Price         $ 135,000      
[1]
As of December 31, 2019, WashREIT had under development multifamily properties, The Trove and Riverside Apartments land parcel. The value not yet placed into service at December 31, 2019 was $96.7 million and $25.6 million, respectively.