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INTEREST RATE SWAP DERIVATIVES - Narrative (FY) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) instrument | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) instrument | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) instrument | Dec. 31, 2019 USD ($) instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Number of swap agreements terminated |  |  |  |  | 3 |
Number of swap agreements classified to liabilities |  |  |  |  | 1 |
Unrealized gain (loss) on derivatives | $ | $ 90,600 | $ (7,785) | $ 517,719 | $ (1,292,752) | $ (770,898) | $ (820,496)
Interest Rate Swap |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Number of mortgage notes payable | 4 |  | 4 |  |  | 4
Number of swap agreements terminated |  |  | 4 |  |  |
Interest Rate Swap | REIT I |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Number of additional derivative instruments acquired |  |  |  |  |  | 8

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