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Real Estate Acquisitions And Discontinued Operations (Acquisition Of Properties And Land For Development During 2011) (Details) (USD $)	9 Months Ended
	Sep. 30, 2011 sqft		Sep. 30, 2010	Dec. 31, 2010
Real Estate Properties [Line Items]
Property Type	Total 2011		Total 2010
Rental Square Feet	1,081,000
Contract purchase price	$ 371,600,000
Real estate investment property, at cost	2,397,338,000			2,051,936,000
1140 Connecticut Avenue [Member]
Real Estate Properties [Line Items]
Acquisition Date	January 11, 2011
Property Type	Office
Rental Square Feet	184,000
1140 Connecticut Avenue [Member] | Property Acquired [Member]
Real Estate Properties [Line Items]
Real estate investment property, at cost	80,250,000
1227 25th Street [Member]
Real Estate Properties [Line Items]
Acquisition Date	March 30, 2011
Property Type	Office
Rental Square Feet	130,000
1227 25th Street [Member] | Property Acquired [Member]
Real Estate Properties [Line Items]
Real estate investment property, at cost	47,000,000
650 North Glebe Road [Member]
Real Estate Properties [Line Items]
Acquisition Date	June 15, 2011	[1]
Property Type	Multifamily	[1]
Rental Square Feet	37,000
WRIT's equity interest in Joint Venture	90.00%
Property Acquired [Member] | 650 North Glebe Road [Member]
Real Estate Properties [Line Items]
Real estate investment property, at cost	11,800,000	[1]
Olney Village Center [Member]
Real Estate Properties [Line Items]
Acquisition Date	August 30, 2011
Property Type	Retail
Rental Square Feet	199,000
Olney Village Center [Member] | Property Acquired [Member]
Real Estate Properties [Line Items]
Real estate investment property, at cost	58,000,000
Braddock Metro Center [Member]
Real Estate Properties [Line Items]
Acquisition Date	September 13, 2011
Property Type	Office
Rental Square Feet	345,000
Braddock Metro Center [Member] | Property Acquired [Member]
Real Estate Properties [Line Items]
Real estate investment property, at cost	101,000,000
John Marshall II [Member]
Real Estate Properties [Line Items]
Acquisition Date	September 15, 2011
Property Type	Office
Rental Square Feet	223,000
John Marshall II [Member] | Property Acquired [Member]
Real Estate Properties [Line Items]
Real estate investment property, at cost	73,500,000
Property Acquired [Member]
Real Estate Properties [Line Items]
Real estate investment property, at cost	$ 371,550,000
[1] 650 North Glebe Road is 37,000 square feet of land acquired by a consolidated joint venture for the purpose of developing an apartment community. WRIT is a 90% owner of joint venturethe .

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Date property was acquired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

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This description includes the geographical location and the type of property (unimproved land, parking garage, shopping center, garden apartment, retail outlet, multi-tenant commercial), and may include the name of the property (such as ABC Shopping Center). An amount not exceeding five percent of the total carrying amount of all real estate investments may be described as miscellaneous investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 360

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-Paragraph 1

-Subparagraph (SX 210.12-28)

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Represents a total which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(d))

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Contract Purchase Price Of Real Estate Property

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Square Footage Of Real Estate Property Acquired

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