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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 |  |  |

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