v3.25.4
Schedule III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule III        
Encumbrances $ 2,546,589      
Initial Cost to Company, Land and Improvements 919,835      
Initial Cost to Company, Buildings and Improvements 1,802,111      
Cost Capitalized Subsequent to Acquisition 2,447,208      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 1,019,967      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 4,149,187      
Gross Amounts at Which Carried at Close of Period, Total 5,169,154 $ 5,722,005 $ 5,875,162 $ 6,158,082
Accumulated Depreciation and Amortization $ 1,408,641 $ 1,420,748 $ 1,338,403 $ 1,335,000
Life of lease 40 years      
Income tax basis difference $ 878,800      
F1RST Residences        
Schedule III        
Encumbrances 77,512      
Initial Cost to Company, Land and Improvements 31,064      
Initial Cost to Company, Buildings and Improvements 133,256      
Cost Capitalized Subsequent to Acquisition 3,731      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 31,091      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 136,960      
Gross Amounts at Which Carried at Close of Period, Total 168,051      
Accumulated Depreciation and Amortization $ 30,952      
Date of Construction 2017      
Date Acquired 2019      
1221 Van Street        
Schedule III        
Encumbrances $ 86,994      
Initial Cost to Company, Land and Improvements 27,386      
Initial Cost to Company, Buildings and Improvements 63,775      
Cost Capitalized Subsequent to Acquisition 29,278      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 28,294      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 92,145      
Gross Amounts at Which Carried at Close of Period, Total 120,439      
Accumulated Depreciation and Amortization $ 31,135      
Date of Construction 2018      
Date Acquired 2017      
RiverHouse Apartments        
Schedule III        
Encumbrances $ 258,936      
Initial Cost to Company, Land and Improvements 118,421      
Initial Cost to Company, Buildings and Improvements 125,078      
Cost Capitalized Subsequent to Acquisition 88,207      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 139,452      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 192,254      
Gross Amounts at Which Carried at Close of Period, Total 331,706      
Accumulated Depreciation and Amortization $ 93,511      
Date of Construction 1960      
Date Acquired 2007      
The Bartlett        
Schedule III        
Encumbrances $ 216,807      
Initial Cost to Company, Land and Improvements 41,687      
Cost Capitalized Subsequent to Acquisition 229,764      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 42,677      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 228,774      
Gross Amounts at Which Carried at Close of Period, Total 271,451      
Accumulated Depreciation and Amortization $ 58,123      
Date of Construction 2016      
Date Acquired 2007      
220 20th Street        
Schedule III        
Encumbrances $ 80,002      
Initial Cost to Company, Land and Improvements 8,434      
Initial Cost to Company, Buildings and Improvements 19,340      
Cost Capitalized Subsequent to Acquisition 101,914      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 9,050      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 120,638      
Gross Amounts at Which Carried at Close of Period, Total 129,688      
Accumulated Depreciation and Amortization $ 52,997      
Date of Construction 2009      
Date Acquired 2017      
West Half        
Schedule III        
Initial Cost to Company, Land and Improvements $ 45,668      
Initial Cost to Company, Buildings and Improvements 17,902      
Cost Capitalized Subsequent to Acquisition 168,321      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 49,073      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 182,818      
Gross Amounts at Which Carried at Close of Period, Total 231,891      
Accumulated Depreciation and Amortization $ 61,010      
Date of Construction 2019      
Date Acquired 2017      
The Wren        
Schedule III        
Encumbrances $ 110,045      
Initial Cost to Company, Land and Improvements 14,306      
Cost Capitalized Subsequent to Acquisition 141,430      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 17,780      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 137,956      
Gross Amounts at Which Carried at Close of Period, Total 155,736      
Accumulated Depreciation and Amortization $ 35,041      
Date of Construction 2020      
Date Acquired 2017      
900 W Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 21,685      
Initial Cost to Company, Buildings and Improvements 5,162      
Cost Capitalized Subsequent to Acquisition 38,676      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 22,182      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 43,341      
Gross Amounts at Which Carried at Close of Period, Total 65,523      
Accumulated Depreciation and Amortization $ 12,639      
Date of Construction 2020      
Date Acquired 2017      
901 W Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 25,992      
Initial Cost to Company, Buildings and Improvements 8,790      
Cost Capitalized Subsequent to Acquisition 65,771      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 27,013      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 73,540      
Gross Amounts at Which Carried at Close of Period, Total 100,553      
Accumulated Depreciation and Amortization $ 20,094      
Date of Construction 2020      
Date Acquired 2017      
2221 S Clark Street Residential        
Schedule III        
Initial Cost to Company, Land and Improvements $ 6,185      
Initial Cost to Company, Buildings and Improvements 16,981      
Cost Capitalized Subsequent to Acquisition 37,049      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 6,547      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 53,668      
Gross Amounts at Which Carried at Close of Period, Total 60,215      
Accumulated Depreciation and Amortization $ 20,696      
Date of Construction 1964      
Date Acquired 2002      
Atlantic Plumbing        
Schedule III        
Initial Cost to Company, Land and Improvements $ 50,287      
Initial Cost to Company, Buildings and Improvements 105,483      
Cost Capitalized Subsequent to Acquisition 1,118      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 50,345      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 106,543      
Gross Amounts at Which Carried at Close of Period, Total 156,888      
Accumulated Depreciation and Amortization $ 15,998      
Date of Construction 2016      
Date Acquired 2022      
The Grace        
Schedule III        
Encumbrances $ 136,536      
Initial Cost to Company, Land and Improvements 7,989      
Initial Cost to Company, Buildings and Improvements 25,276      
Cost Capitalized Subsequent to Acquisition 186,128      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 11,936      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 207,457      
Gross Amounts at Which Carried at Close of Period, Total 219,393      
Accumulated Depreciation and Amortization $ 17,825      
Date of Construction 2023      
Date Acquired 2002      
Reva        
Schedule III        
Encumbrances $ 137,084      
Initial Cost to Company, Land and Improvements 8,822      
Initial Cost to Company, Buildings and Improvements 27,911      
Cost Capitalized Subsequent to Acquisition 179,901      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 13,215      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 203,419      
Gross Amounts at Which Carried at Close of Period, Total 216,634      
Accumulated Depreciation and Amortization $ 16,722      
Date of Construction 2024      
Date Acquired 2002      
The Zoe        
Schedule III        
Encumbrances $ 95,029      
Initial Cost to Company, Land and Improvements 3,449      
Initial Cost to Company, Buildings and Improvements 4,160      
Cost Capitalized Subsequent to Acquisition 152,842      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 5,361      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 155,090      
Gross Amounts at Which Carried at Close of Period, Total 160,451      
Accumulated Depreciation and Amortization $ 7,728      
Date of Construction 2024      
Date Acquired 2002      
Valen        
Schedule III        
Encumbrances $ 99,063      
Initial Cost to Company, Land and Improvements 3,851      
Initial Cost to Company, Buildings and Improvements 4,645      
Cost Capitalized Subsequent to Acquisition 174,575      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 7,060      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 176,011      
Gross Amounts at Which Carried at Close of Period, Total 183,071      
Accumulated Depreciation and Amortization $ 3,158      
Date of Construction 2025      
Date Acquired 2002      
2121 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 21,503      
Initial Cost to Company, Buildings and Improvements 87,329      
Cost Capitalized Subsequent to Acquisition 69,537      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,005      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 154,364      
Gross Amounts at Which Carried at Close of Period, Total 178,369      
Accumulated Depreciation and Amortization $ 74,096      
Date of Construction 1985      
Date Acquired 2002      
2345 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 23,126      
Initial Cost to Company, Buildings and Improvements 93,918      
Cost Capitalized Subsequent to Acquisition 56,489      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,298      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 149,235      
Gross Amounts at Which Carried at Close of Period, Total 173,533      
Accumulated Depreciation and Amortization $ 86,994      
Date of Construction 1988      
Date Acquired 2002      
2231 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 20,611      
Initial Cost to Company, Buildings and Improvements 83,705      
Cost Capitalized Subsequent to Acquisition 28,506      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 21,909      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 110,913      
Gross Amounts at Which Carried at Close of Period, Total 132,822      
Accumulated Depreciation and Amortization $ 66,599      
Date of Construction 1987      
Date Acquired 2002      
1550 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 22,182      
Initial Cost to Company, Buildings and Improvements 70,525      
Cost Capitalized Subsequent to Acquisition 189,647      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 42,947      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 239,407      
Gross Amounts at Which Carried at Close of Period, Total 282,354      
Accumulated Depreciation and Amortization $ 86,372      
Date of Construction 1980, 2020      
Date Acquired 2002      
2011 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 18,940      
Initial Cost to Company, Buildings and Improvements 76,921      
Cost Capitalized Subsequent to Acquisition 91,773      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 20,017      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 167,617      
Gross Amounts at Which Carried at Close of Period, Total 187,634      
Accumulated Depreciation and Amortization $ 67,529      
Date of Construction 1984      
Date Acquired 2002      
2451 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 11,669      
Initial Cost to Company, Buildings and Improvements 68,047      
Cost Capitalized Subsequent to Acquisition 51,562      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 12,600      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 118,678      
Gross Amounts at Which Carried at Close of Period, Total 131,278      
Accumulated Depreciation and Amortization $ 67,171      
Date of Construction 1990      
Date Acquired 2002      
1235 S. Clark Street        
Schedule III        
Encumbrances $ 73,679      
Initial Cost to Company, Land and Improvements 15,826      
Initial Cost to Company, Buildings and Improvements 56,090      
Cost Capitalized Subsequent to Acquisition 28,323      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 16,762      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 83,477      
Gross Amounts at Which Carried at Close of Period, Total 100,239      
Accumulated Depreciation and Amortization $ 50,886      
Date of Construction 1981      
Date Acquired 2002      
241 18th Street S.        
Schedule III        
Initial Cost to Company, Land and Improvements $ 13,867      
Initial Cost to Company, Buildings and Improvements 54,169      
Cost Capitalized Subsequent to Acquisition 62,065      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,084      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 106,017      
Gross Amounts at Which Carried at Close of Period, Total 130,101      
Accumulated Depreciation and Amortization $ 64,423      
Date of Construction 1977      
Date Acquired 2002      
251 18th Street S.        
Schedule III        
Initial Cost to Company, Land and Improvements $ 12,305      
Initial Cost to Company, Buildings and Improvements 49,360      
Cost Capitalized Subsequent to Acquisition 63,453      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 15,596      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 109,522      
Gross Amounts at Which Carried at Close of Period, Total 125,118      
Accumulated Depreciation and Amortization $ 60,974      
Date of Construction 1975      
Date Acquired 2002      
1215 S. Clark Street        
Schedule III        
Encumbrances $ 105,000      
Initial Cost to Company, Land and Improvements 13,636      
Initial Cost to Company, Buildings and Improvements 48,380      
Cost Capitalized Subsequent to Acquisition 54,935      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 14,427      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 102,524      
Gross Amounts at Which Carried at Close of Period, Total 116,951      
Accumulated Depreciation and Amortization $ 63,280      
Date of Construction 1983      
Date Acquired 2002      
201 12th Street S.        
Schedule III        
Initial Cost to Company, Land and Improvements $ 8,432      
Initial Cost to Company, Buildings and Improvements 52,750      
Cost Capitalized Subsequent to Acquisition 24,589      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 9,145      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 76,626      
Gross Amounts at Which Carried at Close of Period, Total 85,771      
Accumulated Depreciation and Amortization $ 45,748      
Date of Construction 1987      
Date Acquired 2002      
800 North Glebe Road        
Schedule III        
Initial Cost to Company, Land and Improvements $ 28,168      
Initial Cost to Company, Buildings and Improvements 140,983      
Cost Capitalized Subsequent to Acquisition 6,981      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 28,168      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 147,964      
Gross Amounts at Which Carried at Close of Period, Total 176,132      
Accumulated Depreciation and Amortization $ 42,290      
Date of Construction 2012      
Date Acquired 2017      
1225 S. Clark Street        
Schedule III        
Encumbrances $ 85,000      
Initial Cost to Company, Land and Improvements 11,176      
Initial Cost to Company, Buildings and Improvements 43,495      
Cost Capitalized Subsequent to Acquisition 38,286      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 11,831      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 81,126      
Gross Amounts at Which Carried at Close of Period, Total 92,957      
Accumulated Depreciation and Amortization $ 44,850      
Date of Construction 1982      
Date Acquired 2002      
1901 South Bell Street        
Schedule III        
Initial Cost to Company, Buildings and Improvements $ 36,918      
Cost Capitalized Subsequent to Acquisition (30,707)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 85      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 6,126      
Gross Amounts at Which Carried at Close of Period, Total 6,211      
Accumulated Depreciation and Amortization $ 1,757      
Date of Construction 1968      
Date Acquired 2002      
200 12th Street S.        
Schedule III        
Initial Cost to Company, Land and Improvements $ 8,016      
Initial Cost to Company, Buildings and Improvements 30,552      
Cost Capitalized Subsequent to Acquisition 15,116      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,488      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 45,196      
Gross Amounts at Which Carried at Close of Period, Total 53,684      
Accumulated Depreciation and Amortization $ 29,551      
Date of Construction 1985      
Date Acquired 2002      
Crystal Drive Retail        
Schedule III        
Initial Cost to Company, Land and Improvements $ 9,300      
Initial Cost to Company, Buildings and Improvements 29,774      
Cost Capitalized Subsequent to Acquisition (10,890)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 6,439      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 21,745      
Gross Amounts at Which Carried at Close of Period, Total 28,184      
Accumulated Depreciation and Amortization $ 14,580      
Date of Construction 2003      
Date Acquired 2004      
One Democracy Plaza        
Schedule III        
Initial Cost to Company, Buildings and Improvements $ 33,628      
Cost Capitalized Subsequent to Acquisition (28,087)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 71      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 5,470      
Gross Amounts at Which Carried at Close of Period, Total 5,541      
Accumulated Depreciation and Amortization $ 2,952      
Date of Construction 1987      
Date Acquired 2002      
1770 Crystal Drive        
Schedule III        
Initial Cost to Company, Land and Improvements $ 10,771      
Initial Cost to Company, Buildings and Improvements 44,276      
Cost Capitalized Subsequent to Acquisition 73,028      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 14,470      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 113,605      
Gross Amounts at Which Carried at Close of Period, Total 128,075      
Accumulated Depreciation and Amortization $ 24,174      
Date of Construction 1980, 2020      
Date Acquired 2002      
1101 17th Street        
Schedule III        
Encumbrances $ 59,902      
Initial Cost to Company, Land and Improvements 23,958      
Initial Cost to Company, Buildings and Improvements 5,030      
Cost Capitalized Subsequent to Acquisition 175      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 23,958      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 5,205      
Gross Amounts at Which Carried at Close of Period, Total 29,163      
Accumulated Depreciation and Amortization $ 305      
Date of Construction 1964      
Date Acquired 2025      
Tysons Dulles plaza        
Schedule III        
Initial Cost to Company, Land and Improvements $ 8,376      
Initial Cost to Company, Buildings and Improvements 17,621      
Cost Capitalized Subsequent to Acquisition 199      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,382      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 17,814      
Gross Amounts at Which Carried at Close of Period, Total 26,196      
Accumulated Depreciation and Amortization $ 1,463      
Date of Construction 1988      
Date Acquired 2025      
1700 M Street        
Schedule III        
Initial Cost to Company, Land and Improvements $ 34,178      
Initial Cost to Company, Buildings and Improvements 46,938      
Cost Capitalized Subsequent to Acquisition (26,130)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 54,986      
Gross Amounts at Which Carried at Close of Period, Total $ 54,986      
Date of Construction 2024      
Date Acquired 2002, 2006      
1831/1861 Wiehle Avenue        
Schedule III        
Initial Cost to Company, Land and Improvements $ 39,529      
Cost Capitalized Subsequent to Acquisition 3,677      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 43,206      
Gross Amounts at Which Carried at Close of Period, Total $ 43,206      
Date of Construction 1984      
Date Acquired 2017      
Development Pipeline        
Schedule III        
Initial Cost to Company, Land and Improvements $ 102,475      
Initial Cost to Company, Buildings and Improvements 30,051      
Cost Capitalized Subsequent to Acquisition 8,289      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 96,044      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 44,771      
Gross Amounts at Which Carried at Close of Period, Total 140,815      
Accumulated Depreciation and Amortization $ 1,008      
Date Acquired various      
Other Land Assets        
Schedule III        
Initial Cost to Company, Land and Improvements $ 46,565      
Initial Cost to Company, Buildings and Improvements 43,892      
Cost Capitalized Subsequent to Acquisition 62,382      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 36,973      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 115,866      
Gross Amounts at Which Carried at Close of Period, Total 152,839      
Accumulated Depreciation and Amortization $ 27,934      
Date Acquired various      
Corporate        
Schedule III        
Encumbrances $ 925,000      
Cost Capitalized Subsequent to Acquisition 15,305      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 15,305      
Gross Amounts at Which Carried at Close of Period, Total 15,305      
Accumulated Depreciation and Amortization $ 6,076      
Date Acquired 2017