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Real Estate - Schedule of Property Dispositions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale	$ 30,324	$ 5,140	$ 48,886
Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale Price	109,326	66,500
Gain (Loss) on Sale	$ 30,324	$ 5,140	$ 48,886
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	$ 2,562
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
Fund IV | Disposal Group, Not Discontinued Operations | 210 Bowery - 3 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	$ 8,826
Gain (Loss) on Sale	$ (242)
Fund IV | Disposal Group, Not Discontinued Operations | 210 Bowery - 3 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 | 210 Bowery - 3 Residential Condos - New York, NY | Scenario Three
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Nov. 07, 2019
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 | 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	$ 2,075
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
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
Sale Price		$ 12,050
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	$ 7,144
Core Portfolio | Disposal Group, Not Discontinued Operations | 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	$ 16,771

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Proceeds from sale of real estate held-for-investment, gross.

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+ 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
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-URI http://asc.fasb.org/extlink&oid=118932676&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=109226348&loc=d3e2443-110228

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