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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Due from (to) Related Parties | $ 527 | $ 363
Other | 3,176 | 1,881
Investments in and advances to unconsolidated affiliates | 305,668 | 249,807
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 15,456 | 15,616
KLA/ABS |  |
Schedule of Equity Method Investments [Line Items] |  |
Cost method investment, ownership percentage | 36.70% |
Cost Method Investment | $ 128,186 | 72,391
Self Storage Management |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 95.00% |
Equity method investments | $ 207 | 207
Fund IV Other Portfolio |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 98.57% |
Equity method investments | $ 12,638 | 11,719
650 Bald Hill Road |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 90.00% |
Equity method investments | $ 11,692 | 12,550
Fund IV |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 24,330 | 24,269
Fund V Family Center at Riverdale |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 89.42% |
Equity method investments | $ 12,612 | 11,824
Tri City Plaza |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 90.00% |
Equity method investments | $ 6,992 | 7,024
Frederick County Acquisitions |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 90.00% |
Equity method investments | $ 10,817 | 10,837
Fund V |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 30,421 | 29,685
Core Portfolio |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 118,821 | 121,011
Core Portfolio | 840 N. Michigan |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 88.43% |
Equity method investments | $ 52,797 | 55,863
Core Portfolio | Renaissance Portfolio |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 20.00% |
Equity method investments | $ 28,669 | 29,270
Core Portfolio | Gotham Plaza |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 49.00% |
Equity method investments | $ 28,892 | 28,683
Core Portfolio | Georgetown Portfolio |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 50.00% |
Equity method investments | $ 4,078 | 4,624
Core Portfolio | 1238 Wisconsin Avenue |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 80.00% |
Equity method investments | $ 4,385 | 2,571
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 | $ 15,456 | $ 15,616

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