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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 28, 2018 | Nov. 16, 2017
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Due to related parties | $ (1,902) | $ (461) |  |
Other | 2,334 | 556 |  |
Investments in and advances to unconsolidated affiliates | 305,097 | 262,410 |  |
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 15,362 | 15,623 |  |
KLA Mervyns LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 10.50% |  |  |
Equity method investments | $ 0 | 0 |  |
Fund III Other Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 94.23% |  |  |
Equity method investments | $ 17 | 21 |  |
Self Storage Management |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 95.00% |  |  |
Equity method investments | $ 207 | 206 |  |
Fund III |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 224 | 227 |  |
Broughton St. Portfolio Savannah, GA |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Equity method investments | $ 12,702 | 3,236 |  |
Fund IV Other Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 98.57% |  |  |
Equity method investments | $ 14,733 | 14,540 |  |
650 Bald Hill Road |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 12,450 | 12,880 |  |
Fund IV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 39,885 | $ 30,656 |  |
Fund V Family Center at Riverdale |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 89.42% |  |  |
Equity method investments | $ 13,329 |  |  |
Tri City Plaza |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 10,250 |  |  |
Frederick County Acquisitions |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 15,070 |  |  |
Fund V |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 38,649 |  |  |
Core Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 75.22% | 61.11% |  | 22.22%
Equity method investments | $ 225,907 | $ 231,432 | $ 22,300 | $ 61,600
Other | $ 1,700 |  |  |
Core Portfolio | 840 N. Michigan |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 88.43% |  |  |
Equity method investments | $ 61,260 | 65,013 |  |
Core Portfolio | Renaissance Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 20.00% |  |  |
Equity method investments | $ 31,815 | 32,458 |  |
Core Portfolio | Gotham Plaza |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  |
Equity method investments | $ 29,466 | 29,550 |  |
Core Portfolio | Town Center |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 75.22% |  |  |
Equity method investments | $ 97,674 | 99,758 |  |
Core Portfolio | Georgetown Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Equity method investments | $ 4,498 | 4,653 |  |
Core Portfolio | 1238 Wisconsin Avenue |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 80.00% |  |  |
Equity method investments | $ 1,194 |  |  |
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 | $ 15,362 | $ 15,623 |  |

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