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Organization and Significant Accounting Policies - Revenues and Tenant and Other Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |  |
Management, transaction, and other fees | $ 19,671 |  | $ 6,142 | $ 33,419 |  | $ 19,084 |
Tenant and other receivables | 139,287 |  |  | 139,287 |  |  | $ 143,633
Management, transaction, and other fee [Member] |  |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |  |
Tenant and other receivables | 11,400 |  |  | 11,400 |  |  | $ 9,900
Property management services [Member] |  |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |  |
Management, transaction, and other fees | 3,450 |  | 3,598 | 10,974 |  | 10,830 |
Asset management services [Member] |  |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |  |
Management, transaction, and other fees | 1,709 |  | 1,657 | 5,143 |  | 5,250 |
Leasing services [Member] |  |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |  |
Management, transaction, and other fees | 879 |  | 708 | 3,066 |  | 1,948 |
Other transaction fees [Member] |  |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |  |
Management, transaction, and other fees | $ 13,633 | [1] | $ 179 | $ 14,236 | [1] | $ 1,056 |
[1] | Includes $13.6 million of promote income earned for exceeding partnership return thresholds resulting from the Company's performance as managing member. This consideration was paid in the form of a real estate asset. See note 2.

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