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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 28, 2018	Nov. 16, 2017
Schedule of Equity Method Investments [Line Items]
Due from (to) Related Parties		$ 243	$ (1,902)
Other		2,030	1,932
Investments in and advances to unconsolidated affiliates	$ 240,414	240,414	305,097
Distributions in excess of income from, and investments in, unconsolidated affiliates	$ 15,462	$ 15,462	15,362
KLA/ABS
Schedule of Equity Method Investments [Line Items]
Cost method investment, ownership percentage	36.70%
Cost Method Investment	$ 57,031		402
Fund III Other Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	94.23%
Equity method investments	$ 17		17
Self Storage Management
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	95.00%
Equity method investments	$ 207		207
Fund III
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 224		224
Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	100.00%
Equity method investments			12,702
Fund IV Other Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	98.57%
Equity method investments	$ 13,300		14,733
650 Bald Hill Road
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 13,672		12,450
Fund IV
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 26,972		39,885
Fund V Family Center at Riverdale
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	89.42%
Equity method investments	$ 12,124		13,329
Fund V
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 31,636		38,649
Tri City Plaza
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 7,395		10,250
Frederick County Acquisitions
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 12,117		15,070
Core Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	75.22%			61.11%		22.22%
Equity method investments	$ 122,278		225,907		$ 22,300	$ 61,600
Other	$ 2,000
Core Portfolio | Renaissance Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	20.00%
Equity method investments	$ 29,729		31,815
Core Portfolio | Gotham Plaza
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Equity method investments	$ 28,975		29,466
Core Portfolio | Town Center
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	100.00%
Equity method investments			97,674
Core Portfolio | Georgetown Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Equity method investments	$ 4,529		4,498
Core Portfolio | 1238 Wisconsin Avenue
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	80.00%
Equity method investments	$ 2,320		1,194
Core Portfolio | 840 N. Michigan
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	88.43%
Equity method investments	$ 56,725		61,260
Core Portfolio | Crossroads
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		49.00%
Distributions in excess of income from, and investments in, unconsolidated affiliates		$ 15,462	$ 15,362

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