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Schedule III (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
property
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Initial Cost        
Land $ 412,214,000      
Buildings and Improvements 1,404,592,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 558,291,000      
Gross Amounts at Which Carried        
Land 384,097,000      
Buildings and Improvements 1,991,000,000      
Total 2,375,097,000 $ 2,299,712,000 $ 1,990,810,000 $ 3,021,232,000
Accumulated Depreciation 528,024,000 479,846,000 401,926,000 $ 749,014,000
Real estate impairment 41,860,000 0 $ 0  
Carrying value for federal income tax purposes 1,500,000,000      
Properties under development or held for future development $ 30,980,000 31,260,000    
Building | Minimum        
Gross Amounts at Which Carried        
Useful life (in years) 3 years      
Building | Maximum        
Gross Amounts at Which Carried        
Useful life (in years) 40 years      
Various development projects        
Gross Amounts at Which Carried        
Properties under development or held for future development $ 600,000      
Residential        
Initial Cost        
Land 366,233,000      
Buildings and Improvements 1,326,267,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 588,313,000      
Gross Amounts at Which Carried        
Land 352,611,000      
Buildings and Improvements 1,928,202,000      
Total 2,280,813,000      
Accumulated Depreciation $ 526,321,000      
Number of residential properties under development | property 1      
Properties under development or held for future development $ 31,000,000 $ 31,300,000    
Residential | 3801 Connecticut Avenue | Washington, D.C.        
Initial Cost        
Land 420,000      
Buildings and Improvements 2,678,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 23,494,000      
Gross Amounts at Which Carried        
Land 420,000      
Buildings and Improvements 26,172,000      
Total 26,592,000      
Accumulated Depreciation $ 18,112,000      
Depreciation Life 30 years      
Residential | Roosevelt Towers | Virginia        
Initial Cost        
Land $ 336,000      
Buildings and Improvements 1,996,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 14,761,000      
Gross Amounts at Which Carried        
Land 336,000      
Buildings and Improvements 16,757,000      
Total 17,093,000      
Accumulated Depreciation $ 13,970,000      
Depreciation Life 40 years      
Residential | Park Adams | Virginia        
Initial Cost        
Land $ 287,000      
Buildings and Improvements 1,654,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 17,029,000      
Gross Amounts at Which Carried        
Land 287,000      
Buildings and Improvements 18,683,000      
Total 18,970,000      
Accumulated Depreciation $ 13,563,000      
Depreciation Life 35 years      
Residential | The Ashby at McLean | Virginia        
Initial Cost        
Land $ 4,356,000      
Buildings and Improvements 17,102,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 35,968,000      
Gross Amounts at Which Carried        
Land 4,356,000      
Buildings and Improvements 53,070,000      
Total 57,426,000      
Accumulated Depreciation $ 37,011,000      
Depreciation Life 30 years      
Residential | Bethesda Hill Apartments | Maryland        
Initial Cost        
Land $ 3,900,000      
Buildings and Improvements 13,412,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 18,064,000      
Gross Amounts at Which Carried        
Land 3,900,000      
Buildings and Improvements 31,476,000      
Total 35,376,000      
Accumulated Depreciation $ 24,995,000      
Depreciation Life 30 years      
Residential | Bennett Park | Virginia        
Initial Cost        
Land $ 2,861,000      
Buildings and Improvements 917,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 83,551,000      
Gross Amounts at Which Carried        
Land 4,774,000      
Buildings and Improvements 82,555,000      
Total 87,329,000      
Accumulated Depreciation $ 52,189,000      
Depreciation Life 28 years      
Residential | The Clayborne | Virginia        
Initial Cost        
Land $ 269,000      
Buildings and Improvements 0      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 32,103,000      
Gross Amounts at Which Carried        
Land 699,000      
Buildings and Improvements 31,673,000      
Total 32,372,000      
Accumulated Depreciation $ 20,797,000      
Depreciation Life 26 years      
Residential | The Kenmore | Washington, D.C.        
Initial Cost        
Land $ 28,222,000      
Buildings and Improvements 33,955,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 22,258,000      
Gross Amounts at Which Carried        
Land 28,222,000      
Buildings and Improvements 56,213,000      
Total 84,435,000      
Accumulated Depreciation $ 26,795,000      
Depreciation Life 30 years      
Residential | The Maxwell | Virginia        
Initial Cost        
Land $ 12,787,000      
Buildings and Improvements 0      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 38,993,000      
Gross Amounts at Which Carried        
Land 12,850,000      
Buildings and Improvements 38,930,000      
Total 51,780,000      
Accumulated Depreciation $ 17,137,000      
Depreciation Life 30 years      
Residential | Yale West | Washington, D.C.        
Initial Cost        
Land $ 14,684,000      
Buildings and Improvements 62,069,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 2,530,000      
Gross Amounts at Which Carried        
Land 14,684,000      
Buildings and Improvements 64,599,000      
Total 79,283,000      
Accumulated Depreciation $ 22,468,000      
Depreciation Life 30 years      
Residential | The Paramount | Virginia        
Initial Cost        
Land $ 8,568,000      
Buildings and Improvements 38,716,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 4,554,000      
Gross Amounts at Which Carried        
Land 8,568,000      
Buildings and Improvements 43,270,000      
Total 51,838,000      
Accumulated Depreciation $ 17,598,000      
Depreciation Life 30 years      
Residential | The Wellington | Virginia        
Initial Cost        
Land $ 30,548,000      
Buildings and Improvements 116,563,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 25,251,000      
Gross Amounts at Which Carried        
Land 30,548,000      
Buildings and Improvements 141,814,000      
Total 172,362,000      
Accumulated Depreciation $ 44,342,000      
Depreciation Life 30 years      
Residential | The Trove | Virginia        
Initial Cost        
Land $ 15,000,000      
Buildings and Improvements 0      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 118,826,000      
Gross Amounts at Which Carried        
Land 15,000,000      
Buildings and Improvements 118,826,000      
Total 133,826,000      
Accumulated Depreciation $ 23,393,000      
Depreciation Life 30 years      
Residential | Riverside Apartments | Virginia        
Initial Cost        
Land $ 38,924,000      
Buildings and Improvements 184,854,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 54,251,000      
Gross Amounts at Which Carried        
Land 38,864,000      
Buildings and Improvements 239,165,000      
Total 278,029,000      
Accumulated Depreciation $ 72,196,000      
Depreciation Life 30 years      
Residential | Riverside Apartments land parcel | Virginia        
Initial Cost        
Land $ 15,968,000      
Buildings and Improvements 0      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 14,419,000      
Gross Amounts at Which Carried        
Land 0      
Buildings and Improvements 30,387,000      
Total 30,387,000      
Accumulated Depreciation 0      
Properties under development or held for future development 30,400,000      
Residential | Elme Alexandria | Virginia        
Initial Cost        
Land 23,942,000      
Buildings and Improvements 93,672,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 19,263,000      
Gross Amounts at Which Carried        
Land 23,942,000      
Buildings and Improvements 112,935,000      
Total 136,877,000      
Accumulated Depreciation $ 19,611,000      
Depreciation Life 30 years      
Residential | Elme Manassas | Virginia        
Initial Cost        
Land $ 13,586,000      
Buildings and Improvements 68,802,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 8,468,000      
Gross Amounts at Which Carried        
Land 13,586,000      
Buildings and Improvements 77,270,000      
Total 90,856,000      
Accumulated Depreciation $ 14,293,000      
Depreciation Life 30 years      
Residential | Elme Dulles | Virginia        
Initial Cost        
Land $ 12,476,000      
Buildings and Improvements 66,852,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 10,415,000      
Gross Amounts at Which Carried        
Land 12,476,000      
Buildings and Improvements 77,267,000      
Total 89,743,000      
Accumulated Depreciation $ 14,082,000      
Depreciation Life 30 years      
Residential | Elme Leesburg | Virginia        
Initial Cost        
Land $ 4,113,000      
Buildings and Improvements 21,286,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 1,832,000      
Gross Amounts at Which Carried        
Land 4,113,000      
Buildings and Improvements 23,118,000      
Total 27,231,000      
Accumulated Depreciation $ 4,937,000      
Depreciation Life 30 years      
Residential | Elme Herndon | Virginia        
Initial Cost        
Land $ 11,225,000      
Buildings and Improvements 51,534,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 8,295,000      
Gross Amounts at Which Carried        
Land 11,225,000      
Buildings and Improvements 59,829,000      
Total 71,054,000      
Accumulated Depreciation $ 11,369,000      
Depreciation Life 30 years      
Residential | Elme Germantown | Maryland        
Initial Cost        
Land $ 7,609,000      
Buildings and Improvements 34,431,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 4,838,000      
Gross Amounts at Which Carried        
Land 7,609,000      
Buildings and Improvements 39,269,000      
Total 46,878,000      
Accumulated Depreciation $ 7,569,000      
Depreciation Life 30 years      
Residential | Elme Watkins Mill | Maryland        
Initial Cost        
Land $ 7,151,000      
Buildings and Improvements 30,851,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 2,548,000      
Gross Amounts at Which Carried        
Land 7,151,000      
Buildings and Improvements 33,399,000      
Total 40,550,000      
Accumulated Depreciation $ 6,900,000      
Depreciation Life 30 years      
Residential | Cascade at Landmark | Virginia        
Initial Cost        
Land $ 12,289,000      
Buildings and Improvements 56,235,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 5,115,000      
Gross Amounts at Which Carried        
Land 12,289,000      
Buildings and Improvements 61,350,000      
Total 73,639,000      
Accumulated Depreciation $ 10,979,000      
Depreciation Life 30 years      
Residential | Elme Conyers | Georgia        
Initial Cost        
Land $ 4,798,000      
Buildings and Improvements 42,122,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 4,001,000      
Gross Amounts at Which Carried        
Land 4,798,000      
Buildings and Improvements 46,123,000      
Total 50,921,000      
Accumulated Depreciation $ 4,843,000      
Depreciation Life 30 years      
Residential | Elme Eagles Landing | Georgia        
Initial Cost        
Land $ 16,117,000      
Buildings and Improvements 86,460,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 5,345,000      
Gross Amounts at Which Carried        
Land 16,117,000      
Buildings and Improvements 91,805,000      
Total 107,922,000      
Accumulated Depreciation $ 8,688,000      
Depreciation Life 30 years      
Residential | Elme Sandy Springs | Georgia        
Initial Cost        
Land $ 17,423,000      
Buildings and Improvements 85,817,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 5,558,000      
Gross Amounts at Which Carried        
Land 17,423,000      
Buildings and Improvements 91,375,000      
Total 108,798,000      
Accumulated Depreciation $ 7,226,000      
Depreciation Life 30 years      
Residential | Elme Marietta | Georgia        
Initial Cost        
Land $ 19,019,000      
Buildings and Improvements 83,319,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 2,737,000      
Gross Amounts at Which Carried        
Land 19,019,000      
Buildings and Improvements 86,056,000      
Total 105,075,000      
Accumulated Depreciation $ 5,945,000      
Depreciation Life 30 years      
Residential | Elme Cumberland | Georgia        
Initial Cost        
Land $ 14,106,000      
Buildings and Improvements 51,689,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 3,705,000      
Gross Amounts at Which Carried        
Land 14,106,000      
Buildings and Improvements 55,394,000      
Total 69,500,000      
Accumulated Depreciation $ 4,098,000      
Depreciation Life 30 years      
Residential | Elme Druid Hills | Georgia        
Initial Cost        
Land $ 25,249,000      
Buildings and Improvements 79,281,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 141,000      
Gross Amounts at Which Carried        
Land 25,249,000      
Buildings and Improvements 79,422,000      
Total 104,671,000      
Accumulated Depreciation $ 1,215,000      
Depreciation Life 30 years      
Office Buildings | Watergate 600 | Washington, D.C.        
Initial Cost        
Land $ 45,981,000      
Buildings and Improvements 78,325,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition (30,022,000)      
Gross Amounts at Which Carried        
Land 31,486,000      
Buildings and Improvements 62,798,000      
Total 94,284,000      
Accumulated Depreciation $ 1,703,000      
Depreciation Life 30 years