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Real Estate - Schedule of Property Dispositions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain Loss On Sale Of Properties | $ 10,521 |  | $ 683 | $ 30,324
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 | 109,326
Gain Loss On Sale Of Properties | $ 9,787 | [1] | $ 683 | $ 30,324
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 Loss On Sale Of Properties | $ 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 Loss On Sale Of Properties |  |  | $ 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 Loss On Sale Of Properties |  |  | $ 86 |
Core Portfolio | Disposed of by sale | Pacesetter Park - Pomona, NY |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Date Sold |  |  |  | Oct. 28, 2019
Sale Price |  |  |  | $ 22,550
Gain Loss On Sale Of Properties |  |  |  | $ 16,771
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 Loss On Sale Of Properties | $ 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 Loss On Sale Of Properties |  |  | $ 0 |
Fund III | Disposed of by sale | 3104 M Street - Washington, DC |  |  |  |
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 Of Properties |  |  |  | $ 2,014
Fund III | Disposed of by sale | 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 Of Properties |  |  |  | $ 2,562
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 Loss On Sale Of Properties | $ 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 Loss On Sale Of Properties |  |  | $ 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 Loss On Sale Of Properties |  |  | $ 24 |
Fund IV | Disposed of by sale | 10 Bowery - 3 Residential Condos - New York, NY |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Date Sold |  |  |  | May 17, 2019
Sale Price |  |  |  | $ 8,826
Gain Loss On Sale Of Properties |  |  |  | $ (242)
Fund IV | Disposed of by sale | 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 Of Properties |  |  |  | $ 2,075
Fund IV | Disposed of by sale | 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 Of Properties |  |  |  | $ 7,144
[1] | Does not include the gain on lease termination of $0.7 million related to the Fund IV lease at 110 University Place (Note 12).

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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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