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Real Estate Disposition Activities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) community land_parcel | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) community home land_parcel | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Summary of income from discontinued operations |  |  |  |  |
Gain on sale of communities | $ 27,243 | $ 27,738 | $ 132,444 | $ 159,754 |
Cash in escrow | $ 225,704 | $ 181,069 | $ 225,704 | 181,069 | $ 134,818
Number of communities held for sale | community | 3 |  | 3 |  |
Number of land parcels held for sale | land_parcel | 1 |  | 1 |  |
Mortgage note receivable payments |  |  | $ 50,929 | $ 0 |
Avalon at Blue Hills and Avalon Canton at Blue Hills [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Number of Apartment Homes Sold | home |  |  | 472 |  |
Proceeds from sale of real estate |  |  | $ 131,250 |  |
Gain on sale of communities |  |  | $ 57,666 |  |
Eaves North Quincy [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Number of Apartment Homes Sold | home |  |  | 224 |  |
Proceeds from sale of real estate |  |  | $ 64,250 |  |
Gain on sale of communities |  |  | $ 18,055 |  |
Avalon Anaheim Stadium [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Number of Apartment Homes Sold | home |  |  | 251 |  |
Proceeds from sale of real estate |  |  | $ 111,600 |  |
Gain on sale of communities |  |  | $ 29,490 |  |
Avalon Ballston Place [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Number of Apartment Homes Sold | home |  |  | 383 |  |
Proceeds from sale of real estate |  |  | $ 169,000 |  |
Gain on sale of communities |  |  | 27,215 |  |
Cash in escrow | $ 85,828 |  | $ 85,828 |  |
West Hollywood Affordable [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Number of Apartment Homes Sold | home |  |  | 77 |  |
Mortgage note receivable payments, including interest | 16,627 |  |  |  |
Mortgage note receivable payments | $ 15,900 |  |  |  |

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