Annual report pursuant to Section 13 and 15(d)

Real Estate Investments - Acquistions (Details)

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Real Estate Investments - Acquistions (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
note
Dec. 31, 2010
Business Acquisition [Line Items]                      
Contract Purchase Price $ 2,462,546,000       $ 2,364,885,000       $ 2,462,546,000 $ 2,364,885,000  
Real estate revenue 77,071,000 [1],[2] 77,108,000 [1],[2] 75,590,000 [1],[2] 75,214,000 [1],[2] 75,413,000 [1],[2] 70,550,000 [1],[2] 70,321,000 [1],[2] 67,872,000 [1],[2] 304,983,000 284,156,000 253,127,000
Land                 17,750,000 90,896,000 38,233,000
Buildings                 26,893,000 219,613,000 93,332,000
Tenant origination costs 3,100,000       15,667,000       3,100,000 15,667,000 9,094,000
Leasing commissions absorption costs 4,172,000       29,719,000       4,172,000 29,719,000 15,349,000
Net lease intangible assets 508,000       6,805,000       508,000 6,805,000 1,375,000
Net lease intangible liabilities (173,000)       (2,454,000)       (173,000) (2,454,000) (1,503,000)
Fair value of assumed mortgage 0       (78,500,000)       0 (78,500,000) 0
Total property purchase price                 52,250,000 281,746,000 155,880,000
Payments to Acquire Real Estate                 52,142,000 [3] 281,701,000 [3] 155,881,000 [3]
Number of Mortgage Notes Assumed                   2  
Notes Assumed                   76,700,000  
Credits received at settlement                 100,000 1,300,000  
Business Acquisition, Pro Forma Information [Abstract]                      
Real estate revenues                   302,836,000  
Loss from continuing operations                   (3,471,000)  
Net income                   104,311,000  
Diluted earnings per share                   $ 1.57  
Fairgate at Ballston [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Jun. 01, 2012    
1140 Connecticut Avenue [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Jan. 01, 2011    
1227 25th Street [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Mar. 01, 2011    
Six Fifty North Glebe Road [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Jun. 01, 2011 [4]    
Cash paid for acquisitions                   11,800,000  
Olney Village Center Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Aug. 01, 2011 [5]    
Braddock Place Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Sep. 01, 2011    
John Marshall II Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Sep. 01, 2011 [5]    
1225 First Street [Member]
                     
Business Acquisition [Line Items]                      
Cash paid for acquisitions                   13,900,000  
Gateway Overlook [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Dec. 01, 2010    
Property Acquired [Member]
                     
Business Acquisition [Line Items]                      
Rentable Square Feet                 142,000 1,092,000 493,000
Contract Purchase Price 52,250,000       385,400,000       52,250,000 385,400,000 156,350,000
Real estate revenue                 3,358,000 20,944,000 5,575,000
Net income                 325,000 484,000 1,460,000
Property Acquired [Member] | Fairgate at Ballston [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                 Jun. 21, 2012    
Type                 Office    
Rentable Square Feet                 142,000    
Contract Purchase Price 52,250,000               52,250,000    
Property Acquired [Member] | 1140 Connecticut Avenue [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                   Jan. 11, 2011  
Type                   Office  
Rentable Square Feet                   188,000  
Contract Purchase Price         80,250,000         80,250,000  
Property Acquired [Member] | 1227 25th Street [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                   Mar. 30, 2011  
Type                   Office  
Rentable Square Feet                   132,000  
Contract Purchase Price         47,000,000         47,000,000  
Property Acquired [Member] | Six Fifty North Glebe Road [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                   Jun. 15, 2011 [6]  
Type                   Mutifamily [6]  
Contract Purchase Price         11,800,000 [6]         11,800,000 [6]  
Property Acquired [Member] | Olney Village Center Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                   Aug. 30, 2011  
Type                   Retail  
Rentable Square Feet                   198,000  
Contract Purchase Price         58,000,000         58,000,000  
Property Acquired [Member] | Braddock Place Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                   Sep. 13, 2011  
Type                   Office  
Rentable Square Feet                   351,000  
Contract Purchase Price         101,000,000         101,000,000  
Property Acquired [Member] | John Marshall II Member
                     
Business Acquisition [Line Items]                      
Acquisition Date                   Sep. 15, 2011  
Type                   Office  
Rentable Square Feet                   223,000  
Contract Purchase Price         73,500,000         73,500,000  
Property Acquired [Member] | 1225 First Street [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                   Nov. 23, 2011 [6]  
Type                   Mutifamily [6]  
Contract Purchase Price         13,850,000 [6]         13,850,000 [6]  
Property Acquired [Member] | 925 and 1000 Corporate Drive [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                     Jun. 03, 2010
Type                     Office
Rentable Square Feet                     270,000
Contract Purchase Price                     68,000,000
Property Acquired [Member] | Gateway Overlook [Member]
                     
Business Acquisition [Line Items]                      
Acquisition Date                     Dec. 01, 2010
Type                     Retail
Rentable Square Feet                     223,000
Contract Purchase Price                     $ 88,350,000
Tenant Origination Costs Member
                     
Business Acquisition [Line Items]                      
Weighted remaining average life, in months                 65 months    
Leasing Commissions Absorption Costs Member
                     
Business Acquisition [Line Items]                      
Weighted remaining average life, in months                 59 months    
Net Lease Intangible Assets Member
                     
Business Acquisition [Line Items]                      
Weighted remaining average life, in months                 76 months    
Net Lease Intangible Liabilities Member
                     
Business Acquisition [Line Items]                      
Weighted remaining average life, in months                 29 months    
[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] See note 3 to the consolidated financial statements for the supplemental disclosure of non-cash investing and financing activities, including the assumption of mortgage debt in conjunction with some of our real estate acquisitions.
[4] As of December 31, 2012, 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 (1225 First Street). The total value not yet placed into service of these development projects via joint venture arrangements at December 31, 2012 was $35.5 million.
[5] At December 31, 2012, 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, $35,535,000 on The Kenmore, $29,996,000 on West Gude Drive, $96,848,000 on 2445 M Street, $53,274,000 on John Marshall II, $19,608,000 on Woodholme Medical Center, $4,337,000 on Ashburn Farm, and $22,343,000 on Olney Village Center.
[6] Land for development