Annual report pursuant to Section 13 and 15(d)

Real Estate Investments Acquistions and Pro-Forma Information (Details)

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Real Estate Investments Acquistions and Pro-Forma Information (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Acquisition [Line Items]                      
Real Estate and Accumulated Depreciation, Description of Property                 Total 2011 Total 2010 Total 2009
Real estate investment property, at cost $ 2,406,783,000       $ 2,051,936,000       $ 2,406,783,000 $ 2,051,936,000  
Real estate revenue 76,708,000 [1],[2] 71,931,000 [1],[2] 71,684,000 [1],[2] 69,204,000 [1],[2] 65,364,000 [1],[2] 65,032,000 [1],[2] 64,087,000 [1],[2] 64,007,000 [1],[2] 289,527,000 258,490,000 256,549,000
Land                 90,900,000 38,200,000 1,300,000
Buildings                 219,600,000 93,300,000 18,600,000
Tenant origination costs 15,700,000       9,100,000       15,700,000 9,100,000 0
Leasing commissions absorption costs 29,700,000       15,400,000       29,700,000 15,400,000 0
Net lease intangible assets 6,800,000       1,400,000       6,800,000 1,400,000 0
Net lease intangible liabilities (2,500,000)       (1,500,000)       (2,500,000) (1,500,000) 0
Fair value of assumed mortgage                 (78,500,000) 0 0
Total property purchase price                 281,700,000 155,900,000 19,900,000
Real estate revenues                 308,027,000 295,767,000  
Income from continuing operations                 (1,701,000) 1,083,000  
Net income                 104,311,000 37,517,000  
Diluted earnings per share                 $ 1.57 $ 0.60  
1140 Connecticut Avenue [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Jan 2011    
1227 25th Street [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Mar 2011    
Six Fifty North Glebe Road [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Jun 2011 [3]    
Olney Village Center Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Aug 2011 [4]    
Braddock Place Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Sep 2011    
John Marshall II Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Sep 2011 [4]    
1219 First Street [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Nov 2011 [3]    
Gateway Overlook [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Dec 2010    
Lansdowne Medical Office Building [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Aug 2009    
Property Acquired Member
                     
Business Acquisition [Line Items]                      
Square Footage Of Real Estate Property Acquired                 1,081,000 494,000,000 87,000,000
Real estate investment property, at cost 385,400,000       156,400,000       385,400,000 156,400,000 19,900,000
Property Acquired Member | 1140 Connecticut Avenue [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 January 11, 2011    
Real Estate and Accumulated Depreciation, Description of Property                 Office    
Square Footage Of Real Estate Property Acquired                 184,000    
Real estate investment property, at cost 80,250,000               80,250,000    
Property Acquired Member | 1227 25th Street [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 March 30, 2011    
Real Estate and Accumulated Depreciation, Description of Property                 Office    
Square Footage Of Real Estate Property Acquired                 130,000    
Real estate investment property, at cost 47,000,000               47,000,000    
Property Acquired Member | Six Fifty North Glebe Road [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 June 15, 2011 [5]    
Real Estate and Accumulated Depreciation, Description of Property                 Mutifamily [5]    
Real estate investment property, at cost 11,800,000 [5]               11,800,000 [5]    
Property Acquired Member | Olney Village Center Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 August 30, 2011    
Real Estate and Accumulated Depreciation, Description of Property                 Retail    
Square Footage Of Real Estate Property Acquired                 199,000    
Real estate investment property, at cost 58,000,000               58,000,000    
Property Acquired Member | Braddock Place Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 September 13, 2011    
Real Estate and Accumulated Depreciation, Description of Property                 Office    
Square Footage Of Real Estate Property Acquired                 345,000    
Real estate investment property, at cost 101,000,000               101,000,000    
Property Acquired Member | John Marshall II Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 September 15, 2011    
Real Estate and Accumulated Depreciation, Description of Property                 Office    
Square Footage Of Real Estate Property Acquired                 223,000    
Real estate investment property, at cost 73,500,000               73,500,000    
Property Acquired Member | Braddock Gateway [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 November 23, 2011 [5]    
Real Estate and Accumulated Depreciation, Description of Property                 Mutifamily [5]    
Property Acquired Member | 1219 First Street [Member]
                     
Business Acquisition [Line Items]                      
Real estate investment property, at cost 13,850,000 [5]               13,850,000 [5]    
Property Acquired Member | Nine Two Five and One Thousand Corporate Drive [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                   June 3, 2010  
Real Estate and Accumulated Depreciation, Description of Property                   Office  
Square Footage Of Real Estate Property Acquired                   271,000,000  
Real estate investment property, at cost         68,000,000         68,000,000  
Property Acquired Member | Gateway Overlook [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                   December 1, 2010  
Real Estate and Accumulated Depreciation, Description of Property                   Retail  
Square Footage Of Real Estate Property Acquired                   223,000,000  
Real estate investment property, at cost         88,400,000         88,400,000  
Property Acquired Member | Lansdowne Medical Office Building [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                     August 13, 2009
Real Estate and Accumulated Depreciation, Description of Property                     Medical Office
Square Footage Of Real Estate Property Acquired                     87,000,000
Real estate investment property, at cost                     19,900,000
Acquisition [Member]
                     
Business Acquisition [Line Items]                      
Real estate revenue                 35,259,000 5,575,000  
Net income                 $ 4,701,000 $ 1,460,000  
[1] With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding.
[2] The prior quarter results have been restated to conform to the current quarter presentation. Specifically, results related to properties sold or held for sale have been reclassified into discontinued operations.
[3] As of December 31, 2011, WRIT had under development via joint venture arrangements, a mid-rise multifamily property in Arlington, Virginia (650 North Glebe) and a high-rise multifamily property in Alexandria, Virginia (1219 First Street). The total land value not yet placed into service of these development projects via joint venture arrangements at December 31, 2011 was $27.8 million.
[4] At December 31, 2011, our properties were encumbered by non-recourse mortgage amounts as follows: $35,399,000 on 3801 Connecticut Avenue, $16,531,000 on Walker House, $29,099,000 on Bethesda Hill, $36,097,000 on The Kenmore, $30,761,000 on West Gude Drive,$95,593,000 on 2445 M Street, $53,936,000 on John Marshall II, $42,997,000 on Prosperity Medical Center, $4,780,000 on 9707 Medical Center Drive, $7,974,000 on 15005 Shady Grove Road, $4,419,000 on Plum Tree Medical Center, $19,954,000 on Woodholme Medical Center, $4,597,000 on Ashburn Farm, $21,700,000 on Frederick Crossing, and $23,873,000 on Olney Village Center.
[5] Land for development