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MERGER AND SELF-MANAGEMENT TRANSACTION - REIT I Purchase Price Allocation (FY) (Details) - REIT I - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Assets: |  |
Real estate property, including above/below lease intangibles |  | $ 151,099,097
Cash and cash equivalents |  | 1,612,331
Tenant receivable |  | 310,169
Prepaid expenses and other assets |  | 51,924
Liabilities: |  |
Mortgage notes payable, net |  | (62,985,425)
Accounts payable and other liabilities |  | (2,243,156)
Net |  | 87,844,940
Less: Cancellation of investment in REIT I (Note 5) | $ 0 | (3,091,489)
Capitalized transaction-related costs |  | (3,044,480)
Net Assets Acquired | $ 0 | $ 81,708,971

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