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Real Estate - Schedule of Property Dispositions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain (Loss) on Sale | $ 12,056 | $ 5,107 | $ 14,070 | $ 5,140 |
Disposal Group, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sale Price |  |  | 83,850 |  | $ 66,500
Gain (Loss) on Sale | $ 12,056 | $ 5,107 | $ 14,070 | $ 5,140 | $ 5,140
Fund III | Disposal Group, Not Discontinued Operations | A3104 M St. Washington D C |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | Jan. 24, 2019 |  |
Sale Price |  |  | $ 10,500 |  |
Gain (Loss) on Sale |  |  | $ 2,014 |  |
Fund III | Disposal Group, Not Discontinued Operations | 3780-3858 Nostrand Avenue - New York, NY |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | Aug. 22, 2019 |  |
Sale Price |  |  | $ 27,650 |  |
Gain (Loss) on Sale |  |  | $ 3,079 |  |
Fund IV | Disposal Group, Not Discontinued Operations | 210 Bowery - 2 Residential Condos - New York, NY | Scenario One |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | May 17, 2019 |  |
Sale Price |  |  | $ 5,900 |  |
Gain (Loss) on Sale |  |  | $ (242) |  |
Fund IV | Disposal Group, Not Discontinued Operations | 210 Bowery - 2 Residential Condos - New York, NY | Scenario Two |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | Sep. 23, 2019 |  |
Fund IV | Disposal Group, Not Discontinued Operations | JFK Plaza - Waterville, ME |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | Jul. 24, 2019 |  |
Sale Price |  |  | $ 7,800 |  |
Gain (Loss) on Sale |  |  | $ 2,012 |  |
Fund IV | Disposal Group, Not Discontinued Operations | 938 W North Avenue - Chicago, IL |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | Sep. 27, 2019 |  |
Sale Price |  |  | $ 32,000 |  |
Gain (Loss) on Sale |  |  | $ 7,207 |  |
Fund IV | Disposal Group, Not Discontinued Operations | Lake Montclair |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Aug. 27, 2018
Sale Price |  |  |  |  | $ 22,450
Gain (Loss) on Sale |  |  |  |  | $ 2,923
Fund IV | Disposal Group, Not Discontinued Operations | 1861 Union Street |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Aug. 29, 2018
Sale Price |  |  |  |  | $ 6,000
Gain (Loss) on Sale |  |  |  |  | $ 2,184
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario One |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Nov. 30, 2018
Sale Price |  |  |  |  | $ 12,050
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Two |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Dec. 10, 2018
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Three |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Dec. 17, 2018
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Four |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Dec. 21, 2018
Fund II | Disposal Group, Not Discontinued Operations | Sherman Avenue |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Apr. 17, 2018
Sale Price |  |  |  |  | $ 26,000
Gain (Loss) on Sale |  |  |  |  | $ 33

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