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REAL ESTATE INVESTMENTS - Finite-Lived Intangible Assets (FY) (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Cost | $ 7,072,592 | $ 6,960,842 |
Accumulated amortization | (2,758,793) | (1,833,054) | $ 0
Net amount | 4,313,799 | 5,127,788 | 7,700,000
Tenant Origination and Absorption Costs |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Cost | 23,570,335 | 23,792,057 | 27,266,610
Accumulated amortization | (11,210,646) | (9,695,960) | (6,005,248)
Net amount | 12,359,689 | 14,096,097 | 21,261,362
Above-Market Lease Intangibles |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Cost | 1,128,549 | 1,128,549 | 1,547,646
Accumulated amortization | (372,620) | (307,707) | (295,912)
Net amount | 755,929 | 820,842 | 1,251,734
Below-Market Lease Intangibles |  |  |
Below Market Lease, Net [Abstract] |  |  |
Cost | (15,097,132) | (15,163,672) | (15,713,975)
Accumulated amortization | 3,266,545 | 2,597,935 | 1,122,616
Net amount | $ (11,830,587) | $ (12,565,737) | $ (14,591,359)

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