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Schedule III (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 units sqft | Dec. 31, 2011 sqft | Dec. 31, 2010 sqft
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Initial Cost, Land | $ 528,576,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 1,483,293,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 517,264,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 529,291,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 1,999,840,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 2,529,131,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 610,536,000 |  |  |  |  |
Net Rentable Square Feet | 10,725,000 | [3] |  |  |  |
Units | 2,540 |  |  |  |  |
Secured Debt | 342,970,000 |  | 423,291,000 |  |  |
Mortgage notes payable | 342,970,000 |  | 427,710,000 |  |  |
Real estate, federal income tax basis | 2,148,544,000 |  |  |  |  |
Area of land | 213,000 |  | 3,272,000 |  | 638,000 |
Land Available for Development | 7,500,000 |  |  |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 2,449,872,000 |  | 2,443,127,000 |  | 2,341,461,000 |
Property acquisitions | 47,772,000 | [4] | 352,658,000 | [4] | 140,584,000 | [4]
Improvements | 59,664,000 | [4] | 36,386,000 | [4] | 28,196,000 | [4]
Impairment write-down | (2,097,000) |  | (16,416,000) |  | 0 |
Write-off of disposed assets | (1,450,000) |  | (1,648,000) |  | (866,000) |
Property sales | (24,630,000) |  | (364,235,000) |  | (66,248,000) |
Balance, end of period | 2,529,131,000 |  | 2,449,872,000 |  | 2,443,127,000 |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 535,732,000 |  | 538,786,000 |  | 475,245,000 |
Depreciation | 84,949,000 |  | 84,167,000 |  | 83,302,000 |
Impairment write-down | 0 |  | (1,291,000) |  | 0 |
Write-off of disposed assets | (1,124,000) |  | (1,648,000) |  | (866,000) |
Property sales | (9,021,000) |  | (84,282,000) |  | (18,895,000) |
Balance, end of period | 610,536,000 |  | 535,732,000 |  | 538,786,000 |
Multifamily Properties [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Initial Cost, Land | 70,956,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 85,559,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 211,147,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 81,918,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 285,743,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 367,661,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 120,036,000 |  |  |  |  |
Net Rentable Square Feet | 2,137,000 | [3] |  |  |  |
3801 Connecticut [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC | [5] |  |  |  |
Initial Cost, Land | 420,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 2,678,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 9,023,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 420,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 11,702,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 12,122,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 8,504,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1951 | [5] |  |  |  |
Date of Acquisition | Jan. 01, 1963 | [5] |  |  |  |
Net Rentable Square Feet | 179,000 | [3],[5] |  |  |  |
Units | 308 | [5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Roosevelt Towers [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 336,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 1,996,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 9,881,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 336,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 11,877,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 12,213,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 7,180,000 |  |  |  |  |
Year of Construction | Jan. 01, 1964 |  |  |  |  |
Date of Acquisition | May 01, 1965 |  |  |  |  |
Net Rentable Square Feet | 170,000 | [3] |  |  |  |
Units | 191 |  |  |  |  |
Depreciation Life | 40 years | [6] |  |  |  |
Country Club Towers [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 299,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 2,562,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 14,461,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 299,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 17,023,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 17,322,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 9,472,000 |  |  |  |  |
Year of Construction | Jan. 01, 1965 |  |  |  |  |
Date of Acquisition | Jul. 01, 1969 |  |  |  |  |
Net Rentable Square Feet | 159,000 | [3] |  |  |  |
Units | 227 |  |  |  |  |
Depreciation Life | 35 years | [6] |  |  |  |
Park Adams [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 287,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 1,654,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 9,141,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 287,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 10,795,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 11,082,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 7,386,000 |  |  |  |  |
Year of Construction | Jan. 01, 1959 |  |  |  |  |
Date of Acquisition | Jan. 01, 1969 |  |  |  |  |
Net Rentable Square Feet | 173,000 | [3] |  |  |  |
Units | 200 |  |  |  |  |
Depreciation Life | 35 years | [6] |  |  |  |
Munson Hill Towers [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 322,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 3,337,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 14,847,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 322,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 18,183,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 18,505,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 12,589,000 |  |  |  |  |
Year of Construction | Jan. 01, 1963 |  |  |  |  |
Date of Acquisition | Jan. 01, 1970 |  |  |  |  |
Net Rentable Square Feet | 258,000 | [3] |  |  |  |
Units | 279 |  |  |  |  |
Depreciation Life | 33 years | [6] |  |  |  |
The Ashby at McLean [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 4,356,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 17,102,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 15,148,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,356,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 32,250,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 36,606,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 17,975,000 |  |  |  |  |
Year of Construction | Jan. 01, 1982 |  |  |  |  |
Date of Acquisition | Aug. 01, 1996 |  |  |  |  |
Net Rentable Square Feet | 274,000 | [3] |  |  |  |
Units | 256 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Walker House Apartments [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland | [5] |  |  |  |
Initial Cost, Land | 2,851,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 7,946,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 6,688,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,851,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 14,634,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 17,485,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 8,508,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1971 | [5] |  |  |  |
Date of Acquisition | Mar. 01, 1996 | [5] |  |  |  |
Net Rentable Square Feet | 157,000 | [3],[5] |  |  |  |
Units | 212 | [5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Bethesda Hill Apartments [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland | [5] |  |  |  |
Initial Cost, Land | 3,900,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 13,412,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 11,903,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 3,900,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 25,315,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 29,215,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 13,593,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1986 | [5] |  |  |  |
Date of Acquisition | Nov. 01, 1997 | [5] |  |  |  |
Net Rentable Square Feet | 225,000 | [3],[5] |  |  |  |
Units | 195 | [5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Bennett Park [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 2,861,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 917,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 78,855,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,774,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 77,859,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 82,633,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 20,017,000 |  |  |  |  |
Year of Construction | Jan. 01, 2007 |  |  |  |  |
Date of Acquisition | Feb. 01, 2001 |  |  |  |  |
Net Rentable Square Feet | 214,000 | [3] |  |  |  |
Units | 224 |  |  |  |  |
Depreciation Life | 28 years | [6] |  |  |  |
The Clayborne [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 269,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 0 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 30,451,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 699,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 30,020,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 30,719,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 8,994,000 |  |  |  |  |
Year of Construction | Jan. 01, 2008 |  |  |  |  |
Date of Acquisition | Jun. 01, 2003 |  |  |  |  |
Net Rentable Square Feet | 60,000 | [3] |  |  |  |
Units | 74 |  |  |  |  |
Depreciation Life | 26 years | [6] |  |  |  |
The Kenmore [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC | [5] |  |  |  |
Initial Cost, Land | 28,222,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 33,955,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,130,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 28,222,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 36,085,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 64,307,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,818,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1948 | [5] |  |  |  |
Date of Acquisition | Sep. 01, 2008 | [5] |  |  |  |
Net Rentable Square Feet | 268,000 | [3],[5] |  |  |  |
Units | 374 | [5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
North Glebe, 650 and 1219 First Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Land Available for Development | 35,500,000 |  |  |  |  |
Six Fifty North Glebe Road [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [7] |  |  |  |
Initial Cost, Land | 12,787,000 | [1],[7] |  |  |  |
Initial Cost, Buildings and Improvements | 0 | [1],[7] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,858,000 | [7] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 15,645,000 | [7] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 0 | [7] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 15,645,000 | [2],[7] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 0 | [7] |  |  |  |
Date of Acquisition | Jun. 01, 2011 | [7] |  |  |  |
Net Rentable Square Feet | 0 | [3],[7] |  |  |  |
Units | 0 | [7] |  |  |  |
1219 First Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [7] |  |  |  |
Initial Cost, Land | 14,046,000 | [1],[7] |  |  |  |
Initial Cost, Buildings and Improvements | 0 | [1],[7] |  |  |  |
Net Improvements (Retirement) since Acquisition | 5,761,000 | [7] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 19,807,000 | [7] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 0 | [7] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 19,807,000 | [2],[7] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 0 | [7] |  |  |  |
Date of Acquisition | Nov. 01, 2011 | [7] |  |  |  |
Net Rentable Square Feet | 0 | [3],[7] |  |  |  |
Units | 0 | [5],[7] |  |  |  |
Office Buildings [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Initial Cost, Land | 274,683,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 863,221,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 204,157,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 263,812,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 1,078,249,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 1,342,061,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 309,483,000 |  |  |  |  |
Net Rentable Square Feet | 4,855,000 | [3] |  |  |  |
1901 Pennsylvania Avenue [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC |  |  |  |  |
Initial Cost, Land | 892,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 3,481,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 15,100,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 892,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 18,581,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 19,473,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 13,478,000 |  |  |  |  |
Year of Construction | Jan. 01, 1960 |  |  |  |  |
Date of Acquisition | May 01, 1977 |  |  |  |  |
Net Rentable Square Feet | 99,000 |  |  |  |  |
Depreciation Life | 28 years | [6] |  |  |  |
51 Monroe Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 840,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 10,869,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 24,173,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 840,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 35,042,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 35,882,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 24,898,000 |  |  |  |  |
Year of Construction | Jan. 01, 1975 |  |  |  |  |
Date of Acquisition | Aug. 01, 1979 |  |  |  |  |
Net Rentable Square Feet | 221,000 |  |  |  |  |
Depreciation Life | 41 years | [6] |  |  |  |
515 King Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 4,102,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 3,931,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 5,125,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,102,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 9,056,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 13,158,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 4,662,000 |  |  |  |  |
Year of Construction | Jan. 01, 1966 |  |  |  |  |
Date of Acquisition | Jul. 01, 1992 |  |  |  |  |
Net Rentable Square Feet | 74,000 |  |  |  |  |
Depreciation Life | 50 years | [6] |  |  |  |
6110 Executive Boulevard [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 4,621,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 11,926,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 11,947,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,621,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 23,873,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 28,494,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 15,372,000 |  |  |  |  |
Year of Construction | Jan. 01, 1971 |  |  |  |  |
Date of Acquisition | Jan. 01, 1995 |  |  |  |  |
Net Rentable Square Feet | 202,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
1220 19th Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC |  |  |  |  |
Initial Cost, Land | 7,803,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 11,366,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 9,690,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 7,802,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 21,057,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 28,859,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 10,065,000 |  |  |  |  |
Year of Construction | Jan. 01, 1976 |  |  |  |  |
Date of Acquisition | Nov. 01, 1995 |  |  |  |  |
Net Rentable Square Feet | 103,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
1600 Wilson Boulevard [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 6,661,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 16,742,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 14,806,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 6,661,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 31,548,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 38,209,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 15,163,000 |  |  |  |  |
Year of Construction | Jan. 01, 1973 |  |  |  |  |
Date of Acquisition | Oct. 01, 1997 |  |  |  |  |
Net Rentable Square Feet | 167,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
7900 Westpark Drive [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 12,049,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 71,825,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 36,150,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 12,049,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 107,975,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 120,024,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 56,264,000 |  |  |  |  |
Year of Construction | Jan. 01, 1972 |  |  |  |  |
Date of Acquisition | Nov. 01, 1997 |  |  |  |  |
Net Rentable Square Feet | 538,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
600 Jefferson Plaza [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 2,296,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 12,188,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 5,512,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,296,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 17,700,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 19,996,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 8,346,000 |  |  |  |  |
Year of Construction | Jan. 01, 1985 |  |  |  |  |
Date of Acquisition | May 01, 1999 |  |  |  |  |
Net Rentable Square Feet | 113,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Wayne Plaza [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 1,564,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 6,243,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 7,928,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 1,564,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 14,171,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 15,735,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 6,537,000 |  |  |  |  |
Year of Construction | Jan. 01, 1970 |  |  |  |  |
Date of Acquisition | May 01, 2000 |  |  |  |  |
Net Rentable Square Feet | 96,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Courthouse Square [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 0 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 17,096,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 6,677,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 0 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 23,773,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 23,773,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 9,844,000 |  |  |  |  |
Year of Construction | Jan. 01, 1979 |  |  |  |  |
Date of Acquisition | Oct. 01, 2000 |  |  |  |  |
Net Rentable Square Feet | 115,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
One Central Plaza [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 5,480,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 39,107,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 16,745,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 5,480,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 55,852,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 61,332,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 23,755,000 |  |  |  |  |
Year of Construction | Jan. 01, 1974 |  |  |  |  |
Date of Acquisition | Apr. 01, 2001 |  |  |  |  |
Net Rentable Square Feet | 267,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Atrium Building [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 3,182,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 11,281,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,987,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 3,182,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 14,268,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 17,450,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,922,000 |  |  |  |  |
Year of Construction | Jan. 01, 1980 |  |  |  |  |
Date of Acquisition | Jul. 01, 2002 |  |  |  |  |
Net Rentable Square Feet | 79,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Area of land | 79,000 |  |  |  |  |
1776 G Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC |  |  |  |  |
Initial Cost, Land | 31,500,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 54,327,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 4,383,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 31,500,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 58,710,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 90,210,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 20,958,000 |  |  |  |  |
Year of Construction | Jan. 01, 1979 |  |  |  |  |
Date of Acquisition | Aug. 01, 2003 |  |  |  |  |
Net Rentable Square Feet | 263,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Dulles Station II [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [8] |  |  |  |
Initial Cost, Land | 15,001,000 | [1],[8] |  |  |  |
Initial Cost, Buildings and Improvements | 494,000 | [1],[8] |  |  |  |
Net Improvements (Retirement) since Acquisition | (3,425,000) | [8] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,130,000 | [8] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 7,940,000 | [8] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 12,070,000 | [2],[8] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 179,000 | [8] |  |  |  |
Date of Acquisition | Dec. 01, 2005 | [8] |  |  |  |
Net Rentable Square Feet | 0 | [8] |  |  |  |
Land Placed In Service | 500,000 |  |  |  |  |
6565 Arlington Boulevard [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [5] |  |  |  |
Initial Cost, Land | 5,584,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 23,195,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 4,677,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 5,584,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 27,872,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 33,456,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 7,719,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1967 | [5] |  |  |  |
Date of Acquisition | Aug. 01, 2006 | [5] |  |  |  |
Net Rentable Square Feet | 132,000 |  |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
West Gude Drive [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland | [5] |  |  |  |
Initial Cost, Land | 11,580,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 43,240,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 8,208,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 11,580,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 51,448,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 63,028,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 12,807,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1984 | [5] |  |  |  |
Date of Acquisition | Aug. 01, 2006 | [5] |  |  |  |
Net Rentable Square Feet | 275,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Monument II [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 10,244,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 65,205,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 3,737,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 10,244,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 68,942,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 79,186,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 15,247,000 |  |  |  |  |
Year of Construction | Jan. 01, 2000 |  |  |  |  |
Date of Acquisition | Mar. 01, 2007 |  |  |  |  |
Net Rentable Square Feet | 207,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Woodholme Center [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 2,194,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 16,711,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 1,794,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,194,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 18,505,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 20,699,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 4,039,000 |  |  |  |  |
Year of Construction | Jan. 01, 1989 |  |  |  |  |
Date of Acquisition | Jun. 01, 2007 |  |  |  |  |
Net Rentable Square Feet | 80,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
2000 M Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC |  |  |  |  |
Initial Cost, Land | 0 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 61,101,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 16,427,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 0 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 77,528,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 77,528,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 13,671,000 |  |  |  |  |
Year of Construction | Jan. 01, 1971 |  |  |  |  |
Date of Acquisition | Dec. 01, 2007 |  |  |  |  |
Net Rentable Square Feet | 228,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
M Street 2445 [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC | [5] |  |  |  |
Initial Cost, Land | 46,887,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 106,743,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,634,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 46,887,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 109,377,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 156,264,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 17,462,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1986 | [5] |  |  |  |
Date of Acquisition | Dec. 01, 2008 | [5] |  |  |  |
Net Rentable Square Feet | 290,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Quantico Building E [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 4,518,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 24,801,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 165,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,518,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 24,966,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 29,484,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 3,692,000 |  |  |  |  |
Year of Construction | Jan. 01, 2007 |  |  |  |  |
Date of Acquisition | Jun. 01, 2010 |  |  |  |  |
Net Rentable Square Feet | 134,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Quantico Building G [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 4,897,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 25,376,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 126,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,898,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 25,501,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 30,399,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 3,921,000 |  |  |  |  |
Year of Construction | Jan. 01, 2009 |  |  |  |  |
Date of Acquisition | Jun. 01, 2010 |  |  |  |  |
Net Rentable Square Feet | 136,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
1140 Connecticut Avenue [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC |  |  |  |  |
Initial Cost, Land | 25,226,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 50,495,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 5,306,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 25,226,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 55,801,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 81,027,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 4,712,000 |  |  |  |  |
Year of Construction | Jan. 01, 1966 |  |  |  |  |
Date of Acquisition | Jan. 01, 2011 |  |  |  |  |
Net Rentable Square Feet | 188,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
1227 25th Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC |  |  |  |  |
Initial Cost, Land | 17,505,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 21,319,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 668,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 17,505,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 21,987,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 39,492,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 2,010,000 |  |  |  |  |
Year of Construction | Jan. 01, 1988 |  |  |  |  |
Date of Acquisition | Mar. 01, 2011 |  |  |  |  |
Net Rentable Square Feet | 132,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Braddock Place Member |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 18,817,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 71,250,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,238,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 18,817,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 73,488,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 92,305,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,009,000 |  |  |  |  |
Year of Construction | Jan. 01, 1985 |  |  |  |  |
Date of Acquisition | Sep. 01, 2011 |  |  |  |  |
Net Rentable Square Feet | 351,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
John Marshall II Member |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [5] |  |  |  |
Initial Cost, Land | 13,490,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 53,024,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 95,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 13,490,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 53,119,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 66,609,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 2,856,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1996 | [5] |  |  |  |
Date of Acquisition | Sep. 01, 2011 | [5] |  |  |  |
Net Rentable Square Feet | 223,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Fairgate at Ballston [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 17,750,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 29,885,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 284,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 17,750,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 30,169,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 47,919,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 895,000 |  |  |  |  |
Year of Construction | Jan. 01, 1988 |  |  |  |  |
Date of Acquisition | Jun. 01, 2012 |  |  |  |  |
Net Rentable Square Feet | 142,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Medical Office [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Initial Cost, Land | 61,179,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 308,148,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 37,546,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 61,225,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 345,647,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 406,872,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 95,797,000 |  |  |  |  |
Net Rentable Square Feet | 1,285,000 | [3] |  |  |  |
Woodburn Medical Park I [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 2,563,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 12,460,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 4,328,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,563,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 16,788,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 19,351,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 8,105,000 |  |  |  |  |
Year of Construction | Jan. 01, 1984 |  |  |  |  |
Date of Acquisition | Nov. 01, 1998 |  |  |  |  |
Net Rentable Square Feet | 73,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Woodburn Medical Park II [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 2,632,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 17,574,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 4,310,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,632,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 21,884,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 24,516,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 10,261,000 |  |  |  |  |
Year of Construction | Jan. 01, 1988 |  |  |  |  |
Date of Acquisition | Nov. 01, 1998 |  |  |  |  |
Net Rentable Square Feet | 96,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
8501 Arlington Boulevard [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [5] |  |  |  |
Initial Cost, Land | 2,071,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 26,317,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 1,281,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,071,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 27,597,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 29,668,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 9,061,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 2000 | [5] |  |  |  |
Date of Acquisition | Oct. 01, 2003 | [5] |  |  |  |
Net Rentable Square Feet | 92,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
8503 Arlington Boulevard [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [5] |  |  |  |
Initial Cost, Land | 1,598,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 25,850,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 1,478,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 1,598,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 27,328,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 28,926,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 8,754,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 2001 | [5] |  |  |  |
Date of Acquisition | Oct. 01, 2003 | [5] |  |  |  |
Net Rentable Square Feet | 88,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
8505 Arlington Boulevard [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [5] |  |  |  |
Initial Cost, Land | 2,819,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 19,680,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 692,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,819,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 20,372,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 23,191,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 6,825,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 2002 | [5] |  |  |  |
Date of Acquisition | Oct. 01, 2003 | [5] |  |  |  |
Net Rentable Square Feet | 75,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Shady Grove Medical Village Ii Member |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 1,995,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 16,601,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 1,524,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 1,995,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 18,125,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 20,120,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,129,000 |  |  |  |  |
Year of Construction | Jan. 01, 1999 |  |  |  |  |
Date of Acquisition | Aug. 01, 2004 |  |  |  |  |
Net Rentable Square Feet | 66,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
8301 Arlington Boulevard [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 1,251,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 6,589,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 1,766,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 1,251,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 8,355,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 9,606,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 2,598,000 |  |  |  |  |
Year of Construction | Jan. 01, 1965 |  |  |  |  |
Date of Acquisition | Oct. 01, 2004 |  |  |  |  |
Net Rentable Square Feet | 50,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Alexandria Professional Center [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 6,783,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 19,676,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 5,955,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 6,783,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 25,631,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 32,414,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 6,019,000 |  |  |  |  |
Year of Construction | Jan. 01, 1968 |  |  |  |  |
Date of Acquisition | Apr. 01, 2006 |  |  |  |  |
Net Rentable Square Feet | 117,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Medical Center Drive 9707 [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland | [5] |  |  |  |
Initial Cost, Land | 3,069,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 11,777,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 1,151,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 3,069,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 12,928,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 15,997,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 3,246,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1994 | [5] |  |  |  |
Date of Acquisition | Apr. 01, 2006 | [5] |  |  |  |
Net Rentable Square Feet | 38,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
15001 Shady Grove Road [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 4,094,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 16,410,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 1,688,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,094,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 18,098,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 22,192,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 4,694,000 |  |  |  |  |
Year of Construction | Jan. 01, 1999 |  |  |  |  |
Date of Acquisition | Apr. 01, 2006 |  |  |  |  |
Net Rentable Square Feet | 51,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Shady Grove Road 15005 [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland | [5] |  |  |  |
Initial Cost, Land | 4,186,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 17,548,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 691,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,186,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 18,239,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 22,425,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 4,227,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 2002 | [5] |  |  |  |
Date of Acquisition | Jul. 01, 2006 | [5] |  |  |  |
Net Rentable Square Feet | 51,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
2440 M Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC |  |  |  |  |
Initial Cost, Land | 12,500,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 37,321,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 5,099,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 12,500,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 42,420,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 54,920,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 9,787,000 |  |  |  |  |
Year of Construction | Jan. 01, 1986 |  |  |  |  |
Date of Acquisition | Mar. 01, 2007 |  |  |  |  |
Net Rentable Square Feet | 113,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Woodholme Medical Center [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland | [5] |  |  |  |
Initial Cost, Land | 3,744,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 24,587,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,015,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 3,744,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 26,602,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 30,346,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,881,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1996 | [5] |  |  |  |
Date of Acquisition | Jun. 01, 2007 | [5] |  |  |  |
Net Rentable Square Feet | 127,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Ashburn Farm Professional Cntr [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [5] |  |  |  |
Initial Cost, Land | 3,770,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 19,200,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 1,458,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 3,770,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 20,658,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 24,428,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 4,412,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1998 | [5] |  |  |  |
Date of Acquisition | Jun. 01, 2007 | [5] |  |  |  |
Net Rentable Square Feet | 75,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
CentreMed I & II [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 2,062,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 12,506,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 759,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,062,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 13,265,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 15,327,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 2,703,000 |  |  |  |  |
Year of Construction | Jan. 01, 1998 |  |  |  |  |
Date of Acquisition | Aug. 01, 2007 |  |  |  |  |
Net Rentable Square Feet | 52,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
4661 Kenmore Avenue [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia | [8] |  |  |  |
Initial Cost, Land | 3,764,000 | [1],[8] |  |  |  |
Initial Cost, Buildings and Improvements | 0 | [1],[8] |  |  |  |
Net Improvements (Retirement) since Acquisition | 46,000 | [8] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 3,810,000 | [8] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 0 | [8] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 3,810,000 | [2],[8] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 0 | [8] |  |  |  |
Date of Acquisition | Aug. 01, 2007 | [8] |  |  |  |
Area of land | 0.8 |  |  |  |  |
Sterling Medical Office Bldg [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 970,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 5,274,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 895,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 970,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 6,169,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 7,139,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 1,434,000 |  |  |  |  |
Year of Construction | Jan. 01, 1986 |  |  |  |  |
Date of Acquisition | May 01, 2008 |  |  |  |  |
Net Rentable Square Feet | 36,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Lansdowne Medical Office Building [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 1,308,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 18,778,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,410,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 1,308,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 21,188,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 22,496,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 2,661,000 |  |  |  |  |
Year of Construction | Jan. 01, 2009 |  |  |  |  |
Date of Acquisition | Aug. 01, 2009 |  |  |  |  |
Net Rentable Square Feet | 85,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Retail Centers [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Initial Cost, Land | 121,758,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 226,365,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 64,414,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 122,336,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 290,201,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 412,537,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 85,220,000 |  |  |  |  |
Net Rentable Square Feet | 2,448,000 | [3] |  |  |  |
Takoma Park [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 415,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 1,084,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 155,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 415,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 1,239,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 1,654,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 1,170,000 |  |  |  |  |
Year of Construction | Jan. 01, 1962 |  |  |  |  |
Date of Acquisition | Jul. 01, 1963 |  |  |  |  |
Net Rentable Square Feet | 51,000 |  |  |  |  |
Depreciation Life | 50 years | [6] |  |  |  |
Westminster [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 519,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 1,775,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 9,140,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 519,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 10,915,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 11,434,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 6,183,000 |  |  |  |  |
Year of Construction | Jan. 01, 1969 |  |  |  |  |
Date of Acquisition | Sep. 01, 1972 |  |  |  |  |
Net Rentable Square Feet | 150,000 |  |  |  |  |
Depreciation Life | 37 years | [6] |  |  |  |
Concord Centre [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 413,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 850,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 3,437,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 413,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 4,287,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 4,700,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 2,885,000 |  |  |  |  |
Year of Construction | Jan. 01, 1960 |  |  |  |  |
Date of Acquisition | Dec. 01, 1973 |  |  |  |  |
Net Rentable Square Feet | 76,000 |  |  |  |  |
Depreciation Life | 33 years | [6] |  |  |  |
Wheaton Park [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 796,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 857,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 4,526,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 796,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 5,383,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 6,179,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 3,207,000 |  |  |  |  |
Year of Construction | Jan. 01, 1967 |  |  |  |  |
Date of Acquisition | Sep. 01, 1977 |  |  |  |  |
Net Rentable Square Feet | 74,000 |  |  |  |  |
Depreciation Life | 50 years | [6] |  |  |  |
Bradlee [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 4,152,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 5,383,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 8,114,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,152,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 13,497,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 17,649,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 9,216,000 |  |  |  |  |
Year of Construction | Jan. 01, 1955 |  |  |  |  |
Date of Acquisition | Dec. 01, 1984 |  |  |  |  |
Net Rentable Square Feet | 168,000 |  |  |  |  |
Depreciation Life | 40 years | [6] |  |  |  |
Chevy Chase Metro Plaza [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Washington, DC |  |  |  |  |
Initial Cost, Land | 1,549,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 4,304,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 4,870,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 1,549,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 9,174,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 10,723,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,698,000 |  |  |  |  |
Year of Construction | Jan. 01, 1975 |  |  |  |  |
Date of Acquisition | Sep. 01, 1985 |  |  |  |  |
Net Rentable Square Feet | 49,000 |  |  |  |  |
Depreciation Life | 50 years | [6] |  |  |  |
Montgomery Village Center [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 11,625,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 9,105,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 3,178,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 11,625,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 12,283,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 23,908,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,139,000 |  |  |  |  |
Year of Construction | Jan. 01, 1969 |  |  |  |  |
Date of Acquisition | Dec. 01, 1992 |  |  |  |  |
Net Rentable Square Feet | 197,000 |  |  |  |  |
Depreciation Life | 50 years | [6] |  |  |  |
Shoppes of Foxchase [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 5,838,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 2,979,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 13,135,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 5,838,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 16,114,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 21,952,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 4,829,000 |  |  |  |  |
Year of Construction | Jan. 01, 1960 |  |  |  |  |
Date of Acquisition | Jun. 01, 1994 |  |  |  |  |
Net Rentable Square Feet | 134,000 |  |  |  |  |
Depreciation Life | 50 years | [6] |  |  |  |
Frederick County Square [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 6,561,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 6,830,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 3,169,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 6,561,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 9,999,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 16,560,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,958,000 |  |  |  |  |
Year of Construction | Jan. 01, 1973 |  |  |  |  |
Date of Acquisition | Aug. 01, 1995 |  |  |  |  |
Net Rentable Square Feet | 227,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
800 S. Washington Street [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Virginia |  |  |  |  |
Initial Cost, Land | 2,904,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 5,489,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 5,992,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 2,904,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 11,481,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 14,385,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 3,714,000 |  |  |  |  |
Year of Construction | Jan. 01, 1951 |  |  |  |  |
Date of Acquisition | Jun. 01, 1998 |  |  |  |  |
Net Rentable Square Feet | 47,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Centre at Hagerstown . [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 13,029,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 25,415,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,165,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 13,029,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 27,580,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 40,609,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 9,815,000 |  |  |  |  |
Year of Construction | Jan. 01, 2000 |  |  |  |  |
Date of Acquisition | Jun. 01, 2002 |  |  |  |  |
Net Rentable Square Feet | 332,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Frederick Crossing [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland | [5] |  |  |  |
Initial Cost, Land | 12,759,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 35,477,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,127,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 12,759,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 37,604,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 50,363,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 10,319,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1999 | [5] |  |  |  |
Date of Acquisition | Mar. 01, 2005 | [5] |  |  |  |
Net Rentable Square Feet | 295,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
Randolph Shopping Center [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 4,928,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 13,025,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 650,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 4,928,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 13,675,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 18,603,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 3,366,000 |  |  |  |  |
Year of Construction | Jan. 01, 1972 |  |  |  |  |
Date of Acquisition | May 01, 2006 |  |  |  |  |
Net Rentable Square Feet | 82,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Montrose Shopping Center [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 11,612,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 22,410,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 2,529,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 11,612,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 24,939,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 36,551,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 6,009,000 |  |  |  |  |
Year of Construction | Jan. 01, 1970 |  |  |  |  |
Date of Acquisition | May 01, 2006 |  |  |  |  |
Net Rentable Square Feet | 145,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Gateway Overlook [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland |  |  |  |  |
Initial Cost, Land | 28,816,000 | [1] |  |  |  |
Initial Cost, Buildings and Improvements | 52,249,000 | [1] |  |  |  |
Net Improvements (Retirement) since Acquisition | 335,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 29,394,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 52,006,000 |  |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 81,400,000 | [2] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 5,588,000 |  |  |  |  |
Year of Construction | Jan. 01, 2007 |  |  |  |  |
Date of Acquisition | Dec. 01, 2010 |  |  |  |  |
Net Rentable Square Feet | 223,000 |  |  |  |  |
Depreciation Life | 30 years | [6] |  |  |  |
Olney Village Center Member |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location | Maryland | [5] |  |  |  |
Initial Cost, Land | 15,842,000 | [1],[5] |  |  |  |
Initial Cost, Buildings and Improvements | 39,133,000 | [1],[5] |  |  |  |
Net Improvements (Retirement) since Acquisition | 892,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Land | 15,842,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Buildings and Improvements | 40,025,000 | [5] |  |  |  |
Gross Amounts at Which Carried at December 31, 2011, Total | 55,867,000 | [2],[5] |  |  |  |
Accumulated Depreciation at December 31, 2011 | 2,124,000 | [5] |  |  |  |
Year of Construction | Jan. 01, 1979 | [5] |  |  |  |
Date of Acquisition | Aug. 01, 2011 | [5] |  |  |  |
Net Rentable Square Feet | 198,000 | [3],[5] |  |  |  |
Depreciation Life | 30 years | [5],[6] |  |  |  |
3801 Connecticut [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Secured Debt | 35,399,000 |  |  |  |  |
Kenmore Apartments [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Mortgage notes payable | 35,535,000 |  | 36,097,000 |  |  |
Walker House Apartments [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Secured Debt | 16,531,000 |  |  |  |  |
West Gude Drive [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Mortgage notes payable | 29,996,000 |  | 30,761,000 |  |  |
Olney Village Center Member |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Mortgage notes payable | 22,343,000 |  | 23,873,000 |  |  |
Bethesda Hill Apartments [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Secured Debt | 29,099,000 |  |  |  |  |
John Marshall II Member |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Mortgage notes payable | 53,274,000 |  | 53,936,000 |  |  |
M Street 2445 [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Mortgage notes payable | 96,848,000 | [9] | 95,593,000 | [9] |  |
Ashburn Farm Professional Cntr [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Secured Debt | 4,337,000 |  |  |  |  |
Woodholme Medical Center [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Mortgage notes payable | $ 19,608,000 |  | $ 19,954,000 |  |  |
Minimum [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Useful Life | 3 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Useful Life | 50 years |  |  |  |  |
[1] | The purchase cost of real estate investments has been divided between land and buildings and improvements on the basis of management’s determination of the fair values.
[2] | At December 31, 2012, total land, buildings and improvements are carried at $2,148,544,000 for federal income tax purposes.
[3] | Residential properties are presented in gross square feet.
[4] | Includes non-cash accruals for capital items and assumed mortgages.
[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] | The useful life shown is for the main structure. Buildings and improvements are depreciated over various useful lives ranging from 3 to 50 years.
[7] | 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.
[8] | As of December 31, 2012, WRIT had land held for development in Herndon, VA (Dulles Station, Phase II). WRIT also held a 0.8 acre parcel of land at 4661 Kenmore for future development. Additionally, WRIT had investments in various smaller development or redevelopment projects. The total land value not yet placed in service of these development projects at December 31, 2012 was $7.5 million. $0.5 million of Dulles Station, Phase II land was placed into service upon the completion of a portion of the parking garage structure.
[9] | Interest only is payable monthly until the maturity date upon which all unpaid principal and interest are payable in full.

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- Definition Gross amount at which land and buildings and improvements are carried at the end of the period for each property. + 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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 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 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Carrying amount as of the balance sheet date of improvements made to the property and capitalized after acquisition. + 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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 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 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition The carrying amount of real estate sold during the period. + 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 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 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) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 + Details
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