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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on Sale | $ 0 | $ 24 | $ 10,521 |  | $ 509 |
Disposed of by sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Sale Price |  |  | 66,325 | [1] |  | $ 22,413
Gain on Sale |  |  | $ 9,787 | [1] |  | $ 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
[1] | Does not include the g

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 + Details
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