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Real Estate Disposition Activities (Details) ft² in Thousands | 3 Months Ended | 9 Months Ended | 21 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) residential_condominium ft² community | Jun. 30, 2021 USD ($) home | Mar. 31, 2021 USD ($) home | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) residential_condominium ft² community | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) residential_condominium ft² community | Dec. 31, 2020 USD ($)
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate | $ 58,000 |  |  | $ 31,607,000 | $ 388,354,000 | $ 91,338,000 |  |
Number Of Communities Held For Sale | community | 1 |  |  |  | 1 |  | 1 |
Number of Residential Condominium Units Sold | residential_condominium | 17 |  |  |  | 43 |  | 113 |
Gain (Loss) on Sale of Other Investments |  |  |  |  | $ 2,051,000 | 8,174,000 |  |
Number of Residential Condominiums Remaining to be Sold | residential_condominium | 59 |  |  |  | 59 |  | 59 |
Other Selling, General and Administrative Expense | $ 1,187,000 |  |  | $ 1,373,000 | $ 3,453,000 | $ 4,012,000 |  |
For-sale condominium inventory | 171,113,000 |  |  |  | 171,113,000 |  | $ 171,113,000 | $ 267,219,000
The Park Loggia |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate | $ 54,277,000 |  |  |  | $ 107,278,000 |  |  |
Number Of Residential Condominium Units | residential_condominium | 172 |  |  |  | 172 |  | 172 |
Commercial Square Feet | ft² | 66 |  |  |  | 66 |  | 66 |
Gain (Loss) on Sale of Other Investments | $ 1,345,000 |  |  |  | $ 2,051,000 |  |  |
eaves Stamford |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home |  |  | 238 |  |  |  |  |
Proceeds from Sale of Real Estate |  |  | $ 72,000,000 |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  |  | $ 53,775,000 |  |  |  |  |
Avalon Norwalk |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home |  | 311 |  |  |  |  |  |
Proceeds from Sale of Real Estate |  | $ 103,000,000 |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | $ 48,912,000 |  |  |  |  |  |
AVA Cortez Hill |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home |  | 299 |  |  |  |  |  |
Proceeds from Sale of Real Estate |  | $ 96,500,000 |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | $ 75,716,000 |  |  |  |  |  |
Avalon Redmond Place |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home |  | 222 |  |  |  |  |  |
Proceeds from Sale of Real Estate |  | $ 97,700,000 |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | $ 72,929,000 |  |  |  |  |  |
Avalon Bronxville |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home |  | 110 |  |  |  |  |  |
Proceeds from Sale of Real Estate |  | $ 89,000,000 |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | $ 71,773,000 |  |  |  |  |  |
Avalon Glen Cove and Avalon Glen Cove North |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number Of Apartment Homes Sold | home |  | 367 |  |  |  |  |  |
Proceeds from Sale of Real Estate |  | $ 126,000,000 |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | $ 65,242,000 |  |  |  |  |  |

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