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REAL ESTATE INVESTMENTS - Finite-Lived Intangible Assets, Future Amortization (FY) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate [Line Items]
2021	$ 1,877,826
2022	787,228
2023	709,832
Net amount	$ 4,313,799	$ 5,127,788	$ 7,700,000
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
Weighted-Average Remaining Amortization Period	9 years 4 months 24 days	9 years 4 months 24 days
Tenant Origination and Absorption Costs
Real Estate [Line Items]
2021	$ 2,682,533	$ 3,801,383
2022	1,805,532	2,628,700
2023	1,689,428	1,751,653
2024	1,311,545	1,625,159
2025	601,734	1,242,973
Thereafter	2,659,530	3,046,229
Net amount	$ 12,359,689	$ 14,096,097	21,261,362
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
Weighted-Average Remaining Amortization Period	7 years 1 month 6 days	7 years 1 month 6 days
Above-Market Lease Intangibles
Real Estate [Line Items]
2021	$ 129,823	$ 129,823
2022	127,174	129,823
2023	122,543	127,174
2024	115,996	122,543
2025	78,557	115,995
Thereafter	116,927	195,484
Net amount	$ 755,929	$ 820,842	1,251,734
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
Weighted-Average Remaining Amortization Period	6 years 9 months 18 days	7 years 2 months 12 days
Below-Market Lease Intangibles
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
2021	$ (1,217,029)	$ (1,462,730)
2022	(921,169)	(1,217,076)
2023	(917,750)	(921,169)
2024	(917,750)	(917,750)
2025	(912,347)	(917,750)
Thereafter	(6,216,928)	(7,129,262)
Net amount	$ (11,830,587)	$ (12,565,737)	$ (14,591,359)
Weighted-Average Remaining Amortization Period	11 years 10 months 24 days	12 years 2 months 12 days

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Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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