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Related Party Transactions and Investments in Non-Consolidated Entities - Equity in losses of investment in non-consolidated REITs (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2019 | Sep. 27, 2018 | Sep. 24, 2018 | Aug. 17, 2018 | Jul. 19, 2018 | May 31, 2009 | Dec. 31, 2007 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019
Sponsored REITs |  |  |  |  |  |  |  |  |  |
Equity in loss of non-consolidated REITs |  |  |  |  |  |  |  | $ (282,000) | $ (387,000) |
Impairment charge |  |  |  |  |  |  |  |  | (309,000) |
Distributions received from non-consolidated REITs |  |  |  |  |  |  |  |  |  |
Equity Method Investment Distribution in Excess of Earnings |  |  |  |  |  |  |  |  | 710,000 |
East Wacker |  |  |  |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |  |  |  |
Equity in loss of non-consolidated REITs |  |  |  |  |  |  |  |  | (26,000) |
Preferred shares purchased |  |  |  |  |  |  | 965.75 |  |  |
Percentage of outstanding preferred shares purchased |  |  |  |  |  |  | 43.70% |  |  |
Liquidating distribution receivable |  |  | $ 70,000,000 |  |  |  |  |  |  |
Gain (loss) on liquidation |  |  | $ 7,100,000 |  |  |  |  |  |  |
Amount received | $ 1,000,000 | $ 69,000,000 |  |  |  |  |  |  |  |
Grand Boulevard |  |  |  |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |  |  |  |
Equity in loss of non-consolidated REITs |  |  |  |  |  |  |  |  | $ (52,000) |
Preferred shares purchased |  |  |  |  |  | 175.5 |  |  |  |
Percentage of outstanding preferred shares purchased |  |  |  |  |  | 27.00% |  |  |  |
Liquidating distribution receivable |  |  |  |  | $ 6,200,000 |  |  |  |  |
Gain (loss) on liquidation |  |  |  |  | $ (100,000) |  |  |  |  |
Amount received |  |  |  | $ 5,900,000 |  |  |  |  |  |
Beneficial interest |  |  |  |  |  |  |  |  |  | $ 100,000

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