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Real Estate Disposition Activities (Details) ft² in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) residential_condominium ft² home community | Jun. 30, 2020 USD ($) home | Mar. 31, 2020 USD ($) home | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) ft² residential_condominium community home | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Summary of income from discontinued operations |  |  |  |  |  |  |
Gain on sale of communities | $ 31,607,000 |  |  | $ 130,484,000 | $ 91,338,000 | $ 165,849,000 |
Number Of Communities Held For Sale | community | 0 |  |  |  | 0 |  |
Number of Residential Condominium Units Sold | residential_condominium | 7 |  |  |  | 59 |  |
Gain (Loss) on Sale of Other Investments |  |  |  |  | $ 8,174,000 | 0 |
Other Selling, General and Administrative Expense | $ 1,373,000 |  |  | $ 1,108,000 | 4,012,000 | $ 2,526,000 |
For-sale condominium inventory | $ 298,429,000 |  |  |  | 298,429,000 |  | $ 457,809,000
Avalon Shelton [Member] |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home |  |  | 250 |  |  |  |
Proceeds from Sale of Real Estate |  |  | $ 64,750,000 |  |  |  |
Gain on sale of communities |  |  | $ 24,413,000 |  |  |  |
Avalon Tinton Falls [Member] |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home |  | 216 |  |  |  |  |
Proceeds from Sale of Real Estate |  | $ 64,900,000 |  |  |  |  |
Gain on sale of communities |  | $ 35,297,000 |  |  |  |  |
Avalon Towers [Member] |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home | 109 |  |  |  |  |  |
Proceeds from Sale of Real Estate | $ 54,000,000 |  |  |  |  |  |
Gain on sale of communities | 31,603,000 |  |  |  |  |  |
The Park Loggia [Member] |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |
Proceeds from Sale of Real Estate | $ 15,699,000 |  |  |  | $ 182,512,000 |  |
Number Of Residential Condominium Units | home | 172 |  |  |  | 172 |  |
Commercial Square Feet | ft² | 67 |  |  |  | 67 |  |
Gain (Loss) on Sale of Other Investments | $ 727,000 |  |  |  | $ 8,174,000 |  |

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