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Schedule III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule III        
Encumbrances $ 2,588,733      
Initial Cost to Company, Land and Improvements 1,061,749      
Initial Cost to Company, Buildings and Improvements 2,147,272      
Cost Capitalized Subsequent to Acquisition 2,512,984      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 1,137,330      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 4,584,675      
Gross Amounts at Which Carried at Close of Period, Total 5,722,005 $ 5,875,162 $ 6,158,082 $ 6,310,361
Accumulated Depreciation and Amortization $ 1,420,748 $ 1,338,403 $ 1,335,000 $ 1,368,012
Life of lease 40 years      
Income tax basis difference $ 657,300      
Operating Real Estate Assets        
Schedule III        
Encumbrances 2,488,774      
Initial Cost to Company, Land and Improvements 1,033,128      
Initial Cost to Company, Buildings and Improvements 1,966,497      
Cost Capitalized Subsequent to Acquisition 2,531,817      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 1,109,172      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 4,422,270      
Gross Amounts at Which Carried at Close of Period, Total 5,531,442      
Accumulated Depreciation and Amortization 1,419,983      
Operating Real Estate Assets | WestEnd25        
Schedule III        
Encumbrances 97,500      
Initial Cost to Company, Land and Improvements 67,049      
Initial Cost to Company, Buildings and Improvements 5,039      
Cost Capitalized Subsequent to Acquisition 116,329      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 69,232      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 119,185      
Gross Amounts at Which Carried at Close of Period, Total 188,417      
Accumulated Depreciation and Amortization $ 47,525      
Date of Construction 2009      
Date Acquired 2007      
Operating Real Estate Assets | 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 2,108      
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 135,337      
Gross Amounts at Which Carried at Close of Period, Total 166,428      
Accumulated Depreciation and Amortization $ 25,961      
Date of Construction 2017      
Date Acquired 2019      
Operating Real Estate Assets | 1221 Van Street        
Schedule III        
Encumbrances $ 87,253      
Initial Cost to Company, Land and Improvements 27,386      
Initial Cost to Company, Buildings and Improvements 63,775      
Cost Capitalized Subsequent to Acquisition 28,998      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 28,300      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 91,859      
Gross Amounts at Which Carried at Close of Period, Total 120,159      
Accumulated Depreciation and Amortization $ 28,210      
Date of Construction 2018      
Date Acquired 2017      
Operating Real Estate Assets | RiverHouse Apartments        
Schedule III        
Encumbrances $ 307,710      
Initial Cost to Company, Land and Improvements 118,421      
Initial Cost to Company, Buildings and Improvements 125,078      
Cost Capitalized Subsequent to Acquisition 105,270      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 139,440      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 209,329      
Gross Amounts at Which Carried at Close of Period, Total 348,769      
Accumulated Depreciation and Amortization $ 106,580      
Date of Construction 1960      
Date Acquired 2007      
Operating Real Estate Assets | The Bartlett        
Schedule III        
Encumbrances $ 217,453      
Initial Cost to Company, Land and Improvements 41,687      
Cost Capitalized Subsequent to Acquisition 229,600      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 42,018      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 229,269      
Gross Amounts at Which Carried at Close of Period, Total 271,287      
Accumulated Depreciation and Amortization $ 52,462      
Date of Construction 2016      
Date Acquired 2007      
Operating Real Estate Assets | 220 20th Street        
Schedule III        
Encumbrances $ 80,240      
Initial Cost to Company, Land and Improvements 8,434      
Initial Cost to Company, Buildings and Improvements 19,340      
Cost Capitalized Subsequent to Acquisition 104,456      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 9,044      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 123,186      
Gross Amounts at Which Carried at Close of Period, Total 132,230      
Accumulated Depreciation and Amortization $ 52,846      
Date of Construction 2009      
Date Acquired 2017      
Operating Real Estate Assets | 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 166,379      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 49,130      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 180,819      
Gross Amounts at Which Carried at Close of Period, Total 229,949      
Accumulated Depreciation and Amortization $ 53,498      
Date of Construction 2019      
Date Acquired 2017      
Operating Real Estate Assets | The Wren        
Schedule III        
Encumbrances $ 110,045      
Initial Cost to Company, Land and Improvements 14,306      
Cost Capitalized Subsequent to Acquisition 141,480      
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 138,006      
Gross Amounts at Which Carried at Close of Period, Total 155,786      
Accumulated Depreciation and Amortization $ 29,850      
Date of Construction 2020      
Date Acquired 2017      
Operating Real Estate Assets | 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 39,256      
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 43,921      
Gross Amounts at Which Carried at Close of Period, Total 66,103      
Accumulated Depreciation and Amortization $ 10,932      
Date of Construction 2020      
Date Acquired 2017      
Operating Real Estate Assets | 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 66,244      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 26,956      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 74,070      
Gross Amounts at Which Carried at Close of Period, Total 101,026      
Accumulated Depreciation and Amortization $ 17,317      
Date of Construction 2020      
Date Acquired 2017      
Operating Real Estate Assets | The Batley        
Schedule III        
Initial Cost to Company, Land and Improvements $ 44,315      
Initial Cost to Company, Buildings and Improvements 158,408      
Cost Capitalized Subsequent to Acquisition 834      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 44,421      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 159,136      
Gross Amounts at Which Carried at Close of Period, Total 203,557      
Accumulated Depreciation and Amortization $ 17,979      
Date of Construction 2019      
Date Acquired 2021      
Operating Real Estate Assets | 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 37,288      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 6,545      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 53,909      
Gross Amounts at Which Carried at Close of Period, Total 60,454      
Accumulated Depreciation and Amortization $ 18,848      
Date of Construction 1964      
Date Acquired 2002      
Operating Real Estate Assets | 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 938      
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 106,363      
Gross Amounts at Which Carried at Close of Period, Total 156,708      
Accumulated Depreciation and Amortization $ 11,328      
Date of Construction 2016      
Date Acquired 2022      
Operating Real Estate Assets | 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 180,976      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 11,823      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 202,418      
Gross Amounts at Which Carried at Close of Period, Total 214,241      
Accumulated Depreciation and Amortization $ 8,253      
Date of Construction 2023      
Date Acquired 2002      
Operating Real Estate Assets | 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 177,762      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 13,053      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 201,442      
Gross Amounts at Which Carried at Close of Period, Total 214,495      
Accumulated Depreciation and Amortization $ 7,461      
Date of Construction 2024      
Date Acquired 2002      
Operating Real Estate Assets | 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 67,691      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,697      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 151,826      
Gross Amounts at Which Carried at Close of Period, Total 176,523      
Accumulated Depreciation and Amortization $ 70,046      
Date of Construction 1985      
Date Acquired 2002      
Operating Real Estate Assets | 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 62,235      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,287      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 154,992      
Gross Amounts at Which Carried at Close of Period, Total 179,279      
Accumulated Depreciation and Amortization $ 87,768      
Date of Construction 1988      
Date Acquired 2002      
Operating Real Estate Assets | 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 35,060      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 22,062      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 117,314      
Gross Amounts at Which Carried at Close of Period, Total 139,376      
Accumulated Depreciation and Amortization $ 67,476      
Date of Construction 1987      
Date Acquired 2002      
Operating Real Estate Assets | 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 190,420      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 42,796      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 240,331      
Gross Amounts at Which Carried at Close of Period, Total 283,127      
Accumulated Depreciation and Amortization $ 78,387      
Date of Construction 1980, 2020      
Date Acquired 2002      
Operating Real Estate Assets | 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 63,490      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 19,976      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 139,375      
Gross Amounts at Which Carried at Close of Period, Total 159,351      
Accumulated Depreciation and Amortization $ 71,716      
Date of Construction 1984      
Date Acquired 2002      
Operating Real Estate Assets | 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 53,547      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 12,594      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 120,669      
Gross Amounts at Which Carried at Close of Period, Total 133,263      
Accumulated Depreciation and Amortization $ 64,550      
Date of Construction 1990      
Date Acquired 2002      
Operating Real Estate Assets | 1235 S. Clark Street        
Schedule III        
Encumbrances $ 75,140      
Initial Cost to Company, Land and Improvements 15,826      
Initial Cost to Company, Buildings and Improvements 56,090      
Cost Capitalized Subsequent to Acquisition 31,131      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 16,753      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 86,294      
Gross Amounts at Which Carried at Close of Period, Total 103,047      
Accumulated Depreciation and Amortization $ 50,889      
Date of Construction 1981      
Date Acquired 2002      
Operating Real Estate Assets | 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 66,124      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 24,076      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 110,084      
Gross Amounts at Which Carried at Close of Period, Total 134,160      
Accumulated Depreciation and Amortization $ 62,564      
Date of Construction 1977      
Date Acquired 2002      
Operating Real Estate Assets | 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 63,663      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 15,589      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 109,739      
Gross Amounts at Which Carried at Close of Period, Total 125,328      
Accumulated Depreciation and Amortization $ 62,899      
Date of Construction 1975      
Date Acquired 2002      
Operating Real Estate Assets | 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 56,057      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 14,419      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 103,654      
Gross Amounts at Which Carried at Close of Period, Total 118,073      
Accumulated Depreciation and Amortization $ 59,848      
Date of Construction 1983      
Date Acquired 2002      
Operating Real Estate Assets | 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 31,370      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 9,126      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 83,426      
Gross Amounts at Which Carried at Close of Period, Total 92,552      
Accumulated Depreciation and Amortization $ 50,136      
Date of Construction 1987      
Date Acquired 2002      
Operating Real Estate Assets | 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 6,538      
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 147,521      
Gross Amounts at Which Carried at Close of Period, Total 175,689      
Accumulated Depreciation and Amortization $ 37,432      
Date of Construction 2012      
Date Acquired 2017      
Operating Real Estate Assets | 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 39,790      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 11,825      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 82,636      
Gross Amounts at Which Carried at Close of Period, Total 94,461      
Accumulated Depreciation and Amortization $ 43,984      
Date of Construction 1982      
Date Acquired 2002      
Operating Real Estate Assets | 1901 South Bell Street        
Schedule III        
Initial Cost to Company, Buildings and Improvements $ 36,918      
Cost Capitalized Subsequent to Acquisition (30,382)      
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 6,451      
Gross Amounts at Which Carried at Close of Period, Total 6,536      
Accumulated Depreciation and Amortization $ 506      
Date of Construction 1968      
Date Acquired 2002      
Operating Real Estate Assets | 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 15,911      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,483      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 45,996      
Gross Amounts at Which Carried at Close of Period, Total 54,479      
Accumulated Depreciation and Amortization $ 28,648      
Date of Construction 1985      
Date Acquired 2002      
Operating Real Estate Assets | 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 (7,300)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 8,325      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 23,449      
Gross Amounts at Which Carried at Close of Period, Total 31,774      
Accumulated Depreciation and Amortization $ 16,579      
Date of Construction 2003      
Date Acquired 2004      
Operating Real Estate Assets | One Democracy Plaza        
Schedule III        
Initial Cost to Company, Buildings and Improvements $ 33,628      
Cost Capitalized Subsequent to Acquisition (27,064)      
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 6,493      
Gross Amounts at Which Carried at Close of Period, Total 6,564      
Accumulated Depreciation and Amortization $ 3,138      
Date of Construction 1987      
Date Acquired 2002      
Operating Real Estate Assets | 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 72,945      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 14,416      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 113,576      
Gross Amounts at Which Carried at Close of Period, Total 127,992      
Accumulated Depreciation and Amortization $ 19,183      
Date of Construction 1980, 2020      
Date Acquired 2002      
Operating Real Estate Assets | 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      
Operating Real Estate Assets | 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      
Operating Real Estate Assets | 2000 and 2001 South Bell Street        
Schedule III        
Encumbrances $ 167,301      
Initial Cost to Company, Land and Improvements 7,300      
Initial Cost to Company, Buildings and Improvements 8,805      
Cost Capitalized Subsequent to Acquisition 301,810      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 4,716      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 313,199      
Gross Amounts at Which Carried at Close of Period, Total 317,915      
Accumulated Depreciation and Amortization $ 937      
Date of Construction 2024      
Date Acquired 2002      
Operating Real Estate Assets | Development Pipeline        
Schedule III        
Initial Cost to Company, Land and Improvements $ 183,303      
Initial Cost to Company, Buildings and Improvements 97,533      
Cost Capitalized Subsequent to Acquisition 46,277      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 147,156      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 179,957      
Gross Amounts at Which Carried at Close of Period, Total 327,113      
Accumulated Depreciation and Amortization $ 48,400      
Date Acquired various      
Operating Real Estate Assets | Corporation        
Schedule III        
Encumbrances $ 805,000      
Cost Capitalized Subsequent to Acquisition 17,039      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 17,039      
Gross Amounts at Which Carried at Close of Period, Total 17,039      
Accumulated Depreciation and Amortization $ 5,847      
Date Acquired 2017      
Held-for-Sale | 8001 Woodmont        
Schedule III        
Encumbrances $ 99,959      
Initial Cost to Company, Land and Improvements 28,621      
Initial Cost to Company, Buildings and Improvements 180,775      
Cost Capitalized Subsequent to Acquisition (18,833)      
Gross Amounts at Which Carried at Close of Period, Land and Improvements 28,158      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 162,405      
Gross Amounts at Which Carried at Close of Period, Total 190,563      
Accumulated Depreciation and Amortization $ 765      
Date of Construction 2021      
Date Acquired 2022