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SCHEDULE III (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
property
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Initial Cost        
Land $ 412,214,000      
Buildings and Improvements 1,404,592,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 597,507,000      
Gross Amounts at Which Carried        
Land 383,808,000      
Buildings and Improvements 2,030,505,000      
Total 2,414,313,000 $ 2,375,097,000 $ 2,299,712,000 $ 1,990,810,000
Accumulated Depreciation 618,299,000 528,024,000 479,846,000 $ 401,926,000
Real estate impairment 0 41,860,000 $ 0  
Carrying value for federal income tax purposes 1,500,000,000      
Properties under development or held for future development $ 30,980,000 30,980,000    
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 627,524,000      
Gross Amounts at Which Carried        
Land 352,322,000      
Buildings and Improvements 1,967,702,000      
Total 2,320,024,000      
Accumulated Depreciation $ 612,375,000      
Number of residential properties under development | property 1      
Properties under development or held for future development $ 31,000,000.0 $ 31,000,000.0    
Residential | 3801 Connecticut Avenue        
Initial Cost        
Land 420,000      
Buildings and Improvements 2,678,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 23,809,000      
Gross Amounts at Which Carried        
Land 420,000      
Buildings and Improvements 26,487,000      
Total 26,907,000      
Accumulated Depreciation $ 19,246,000      
Depreciation Life 30 years      
Residential | Roosevelt Towers        
Initial Cost        
Land $ 336,000      
Buildings and Improvements 1,996,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 15,779,000      
Gross Amounts at Which Carried        
Land 336,000      
Buildings and Improvements 17,775,000      
Total 18,111,000      
Accumulated Depreciation $ 14,539,000      
Depreciation Life 40 years      
Residential | Park Adams        
Initial Cost        
Land $ 287,000      
Buildings and Improvements 1,654,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 18,458,000      
Gross Amounts at Which Carried        
Land 287,000      
Buildings and Improvements 20,112,000      
Total 20,399,000      
Accumulated Depreciation $ 14,327,000      
Depreciation Life 35 years      
Residential | The Ashby at McLean        
Initial Cost        
Land $ 4,356,000      
Buildings and Improvements 17,102,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 36,436,000      
Gross Amounts at Which Carried        
Land 4,356,000      
Buildings and Improvements 53,538,000      
Total 57,894,000      
Accumulated Depreciation $ 39,538,000      
Depreciation Life 30 years      
Residential | Bethesda Hill Apartments        
Initial Cost        
Land $ 3,900,000      
Buildings and Improvements 13,412,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 18,668,000      
Gross Amounts at Which Carried        
Land 3,900,000      
Buildings and Improvements 32,080,000      
Total 35,980,000      
Accumulated Depreciation $ 26,066,000      
Depreciation Life 30 years      
Residential | Bennett Park        
Initial Cost        
Land $ 2,861,000      
Buildings and Improvements 917,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 83,946,000      
Gross Amounts at Which Carried        
Land 4,774,000      
Buildings and Improvements 82,950,000      
Total 87,724,000      
Accumulated Depreciation $ 55,126,000      
Depreciation Life 28 years      
Residential | The Clayborne        
Initial Cost        
Land $ 269,000      
Buildings and Improvements 0      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 32,363,000      
Gross Amounts at Which Carried        
Land 699,000      
Buildings and Improvements 31,933,000      
Total 32,632,000      
Accumulated Depreciation $ 21,766,000      
Depreciation Life 26 years      
Residential | Kenmore Apartments        
Initial Cost        
Land $ 28,222,000      
Buildings and Improvements 33,955,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 23,147,000      
Gross Amounts at Which Carried        
Land 28,222,000      
Buildings and Improvements 57,102,000      
Total 85,324,000      
Accumulated Depreciation $ 29,074,000      
Depreciation Life 30 years      
Residential | The Maxwell        
Initial Cost        
Land $ 12,787,000      
Buildings and Improvements 0      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 39,354,000      
Gross Amounts at Which Carried        
Land 12,850,000      
Buildings and Improvements 39,291,000      
Total 52,141,000      
Accumulated Depreciation $ 18,715,000      
Depreciation Life 30 years      
Residential | Yale West        
Initial Cost        
Land $ 14,684,000      
Buildings and Improvements 62,069,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 2,705,000      
Gross Amounts at Which Carried        
Land 14,684,000      
Buildings and Improvements 64,774,000      
Total 79,458,000      
Accumulated Depreciation $ 24,738,000      
Depreciation Life 30 years      
Residential | The Paramount        
Initial Cost        
Land $ 8,568,000      
Buildings and Improvements 38,716,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 4,722,000      
Gross Amounts at Which Carried        
Land 8,568,000      
Buildings and Improvements 43,438,000      
Total 52,006,000      
Accumulated Depreciation $ 19,137,000      
Depreciation Life 30 years      
Residential | The Wellington        
Initial Cost        
Land $ 30,548,000      
Buildings and Improvements 116,563,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 28,346,000      
Gross Amounts at Which Carried        
Land 30,259,000      
Buildings and Improvements 145,198,000      
Total 175,457,000      
Accumulated Depreciation $ 50,239,000      
Depreciation Life 30 years      
Residential | Trove        
Initial Cost        
Land $ 15,000,000      
Buildings and Improvements 0      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 119,069,000      
Gross Amounts at Which Carried        
Land 15,000,000      
Buildings and Improvements 119,069,000      
Total 134,069,000      
Accumulated Depreciation $ 30,163,000      
Depreciation Life 30 years      
Residential | Riverside Apartments        
Initial Cost        
Land $ 38,924,000      
Buildings and Improvements 184,854,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 58,959,000      
Gross Amounts at Which Carried        
Land 38,864,000      
Buildings and Improvements 243,873,000      
Total 282,737,000      
Accumulated Depreciation $ 82,380,000      
Depreciation Life 30 years      
Residential | Riverside Apartments land parcel        
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      
Residential | Riverside Apartments land parcel | Virginia        
Gross Amounts at Which Carried        
Properties under development or held for future development 30,400,000      
Residential | Elme Alexandria        
Initial Cost        
Land 23,942,000      
Buildings and Improvements 93,672,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 23,148,000      
Gross Amounts at Which Carried        
Land 23,942,000      
Buildings and Improvements 116,820,000      
Total 140,762,000      
Accumulated Depreciation $ 25,204,000      
Depreciation Life 30 years      
Residential | Elme Manassas        
Initial Cost        
Land $ 13,586,000      
Buildings and Improvements 68,802,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 10,600,000      
Gross Amounts at Which Carried        
Land 13,586,000      
Buildings and Improvements 79,402,000      
Total 92,988,000      
Accumulated Depreciation $ 17,884,000      
Depreciation Life 30 years      
Residential | Elme Dulles        
Initial Cost        
Land $ 12,476,000      
Buildings and Improvements 66,852,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 11,927,000      
Gross Amounts at Which Carried        
Land 12,476,000      
Buildings and Improvements 78,779,000      
Total 91,255,000      
Accumulated Depreciation $ 17,734,000      
Depreciation Life 30 years      
Residential | Elme Leesburg        
Initial Cost        
Land $ 4,113,000      
Buildings and Improvements 21,286,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 2,532,000      
Gross Amounts at Which Carried        
Land 4,113,000      
Buildings and Improvements 23,818,000      
Total 27,931,000      
Accumulated Depreciation $ 6,003,000      
Depreciation Life 30 years      
Residential | Elme Herndon        
Initial Cost        
Land $ 11,225,000      
Buildings and Improvements 51,534,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 9,729,000      
Gross Amounts at Which Carried        
Land 11,225,000      
Buildings and Improvements 61,263,000      
Total 72,488,000      
Accumulated Depreciation $ 14,077,000      
Depreciation Life 30 years      
Residential | Elme Germantown        
Initial Cost        
Land $ 7,609,000      
Buildings and Improvements 34,431,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 5,149,000      
Gross Amounts at Which Carried        
Land 7,609,000      
Buildings and Improvements 39,580,000      
Total 47,189,000      
Accumulated Depreciation $ 9,334,000      
Depreciation Life 30 years      
Residential | Elme Watkins Mill        
Initial Cost        
Land $ 7,151,000      
Buildings and Improvements 30,851,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 3,066,000      
Gross Amounts at Which Carried        
Land 7,151,000      
Buildings and Improvements 33,917,000      
Total 41,068,000      
Accumulated Depreciation $ 8,446,000      
Depreciation Life 30 years      
Residential | Cascade at Landmark        
Initial Cost        
Land $ 12,289,000      
Buildings and Improvements 56,235,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 6,355,000      
Gross Amounts at Which Carried        
Land 12,289,000      
Buildings and Improvements 62,590,000      
Total 74,879,000      
Accumulated Depreciation $ 13,472,000      
Depreciation Life 30 years      
Residential | Elme Conyers        
Initial Cost        
Land $ 4,798,000      
Buildings and Improvements 42,122,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 4,861,000      
Gross Amounts at Which Carried        
Land 4,798,000      
Buildings and Improvements 46,983,000      
Total 51,781,000      
Accumulated Depreciation $ 7,181,000      
Depreciation Life 30 years      
Residential | Elme Eagles Landing        
Initial Cost        
Land $ 16,117,000      
Buildings and Improvements 86,460,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 8,227,000      
Gross Amounts at Which Carried        
Land 16,117,000      
Buildings and Improvements 94,687,000      
Total 110,804,000      
Accumulated Depreciation $ 13,486,000      
Depreciation Life 30 years      
Residential | Elme Sandy Springs        
Initial Cost        
Land $ 17,423,000      
Buildings and Improvements 85,817,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 8,900,000      
Gross Amounts at Which Carried        
Land 17,423,000      
Buildings and Improvements 94,717,000      
Total 112,140,000      
Accumulated Depreciation $ 11,966,000      
Depreciation Life 30 years      
Residential | Elme Marietta        
Initial Cost        
Land $ 19,019,000      
Buildings and Improvements 83,319,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 3,314,000      
Gross Amounts at Which Carried        
Land 19,019,000      
Buildings and Improvements 86,633,000      
Total 105,652,000      
Accumulated Depreciation $ 9,965,000      
Depreciation Life 30 years      
Residential | Elme Cumberland        
Initial Cost        
Land $ 14,106,000      
Buildings and Improvements 51,689,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 5,624,000      
Gross Amounts at Which Carried        
Land 14,106,000      
Buildings and Improvements 57,313,000      
Total 71,419,000      
Accumulated Depreciation $ 6,997,000      
Depreciation Life 30 years      
Residential | Elme Druid Hills        
Initial Cost        
Land $ 25,249,000      
Buildings and Improvements 79,281,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition 3,912,000      
Gross Amounts at Which Carried        
Land 25,249,000      
Buildings and Improvements 83,193,000      
Total 108,442,000      
Accumulated Depreciation $ 5,572,000      
Depreciation Life 30 years      
Office Building | Watergate 600        
Initial Cost        
Land $ 45,981,000      
Buildings and Improvements 78,325,000      
Net Improvements (Retirement) since Acquisition        
Net Improvements (Retirement) since Acquisition (30,017,000)      
Gross Amounts at Which Carried        
Land 31,486,000      
Buildings and Improvements 62,803,000      
Total 94,289,000      
Accumulated Depreciation $ 5,924,000      
Depreciation Life 30 years