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Real Estate Disposition Activities (Details) ft² in Thousands | 3 Months Ended | 6 Months Ended | 18 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) home residential_condominium ft² community | Mar. 31, 2021 USD ($) home | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) residential_condominium ft² community | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) residential_condominium ft² community | Dec. 31, 2020 USD ($)
Summary of income from discontinued operations |  |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate | $ 334,569,000 |  | $ 35,295,000 | $ 388,296,000 | $ 59,731,000 |  |
Number Of Communities Held For Sale | community | 0 |  |  | 0 |  | 0 |
Number of Residential Condominium Units Sold | residential_condominium | 16 |  |  | 26 |  | 96 |
Gain (Loss) on Sale of Other Investments |  |  |  | $ 706,000 | 7,446,000 |  |
Number of Residential Condominiums Remaining to be Sold | residential_condominium | 76 |  |  | 76 |  | 76 |
Other Selling, General and Administrative Expense | $ 1,222,000 |  | $ 1,196,000 | $ 2,266,000 | $ 2,639,000 |  |
For-sale condominium inventory | $ 220,022,000 |  |  | 220,022,000 |  | $ 220,022,000 | $ 267,219,000
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 |  |  |  |  |  |
The Park Loggia [Member] |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |
Proceeds from Sale of Real Estate | $ 38,392,000 |  |  | $ 53,001,000 |  |  |
Number Of Residential Condominium Units | residential_condominium | 172 |  |  | 172 |  | 172 |
Commercial Square Feet | ft² | 66 |  |  | 66 |  | 66 |
Gain (Loss) on Sale of Other Investments | $ 575,000 |  |  | $ 706,000 |  |  |

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