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Real Estate - Schedule of Property Dispositions (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on Sale | $ 5,909 | $ 485 | $ 10,521 | $ 485 |
Disposed of by sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sale Price |  |  | 66,325 |  | $ 22,413
Gain on Sale |  |  | $ 9,787 |  | $ 683
Core Portfolio | Disposed of by sale | 60 Orange St - Bloomfield, NJ. |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | Jan. 29, 2021 |  |
Sale Price |  |  | $ 16,400 |  |
Gain on Sale |  |  | $ 4,612 |  |
Core Portfolio | Disposed of by sale | 163 Highland Ave. (Easement) - Needham, MA |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Mar. 19, 2020
Sale Price |  |  |  |  | $ 238
Gain on Sale |  |  |  |  | $ 88
Core Portfolio | Disposed of by sale | Union Township (Parcel) - New Castle, PA |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Dec. 11, 2020
Sale Price |  |  |  |  | $ 200
Gain on Sale |  |  |  |  | $ 86
Fund IV | Disposed of by sale | NE Grocer Portfolio (Selected Assets) - Maine |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | Jun. 18, 2021 |  |
Sale Price |  |  | $ 39,925 |  |
Gain on Sale |  |  | $ 5,064 |  |
Fund IV | Disposed of by sale | Colonie Plaza - Albany, NY |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Apr. 13, 2020
Sale Price |  |  |  |  | $ 15,250
Gain on Sale |  |  |  |  | $ 485
Fund IV | Disposed of by sale | Airport Mall (Parcel) - Bangor, ME |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Sep. 10, 2020
Sale Price |  |  |  |  | $ 400
Gain on Sale |  |  |  |  | $ 24
Fund III | Disposed of by sale | 654 Broadway - New York, NY |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  | May 19, 2021 |  |
Sale Price |  |  | $ 10,000 |  |
Gain on Sale |  |  | $ 111 |  |
Fund III | Disposed of by sale | Cortlandt Crossing (Sewer Project and Retention Pond) - Cortlandt, NY |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Date Sold |  |  |  |  | Nov. 30, 2020
Sale Price |  |  |  |  | $ 6,325
Gain on Sale |  |  |  |  | $ 0

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