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Prepaid Expenses and Other Assets, net (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |
Deposits for future acquisitions | $ 20,500,000 |  | $ 0
Goodwill | 8,754,000 |  | 8,754,000
Non-real estate investments | 5,545,000 |  | 2,713,000
Derivative assets | 655,000 |  | 16,687,000
Other | 33,698,000 |  | 27,479,000
Prepaid expenses and other assets, net | 69,152,000 |  | $ 55,633,000
Unrealized gain on observable changes in fair value | 928,000 |  |
Washington State Convention Center Addition |  |  |
Variable Interest Entity [Line Items] |  |  |
Deposits for future acquisitions |  | $ 20,500,000 |
Purchase price of assets acquired |  | $ 86,000,000.0 |
Remaining future commitment expected to be settled | 65,500,000 |  |
Real Estate Technology Venture Capital Fund |  |  |
Variable Interest Entity [Line Items] |  |  |
Commitment to fund real estate technology venture capital fund | 20,000,000.0 |  |
Contributions to date | 2,800,000 |  |
Remaining contribution amount | $ 17,200,000 |  |

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