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SUMMARY OF SIGNIFICANT ACOUNTING POLICIES - Narrative (FY) (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2021 $ / shares | Jan. 31, 2021 $ / shares | Dec. 31, 2020 USD ($) Segments $ / shares shares | Dec. 31, 2019 USD ($) Segments $ / shares shares | Jun. 30, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) property $ / shares | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) property $ / shares | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2019 | Dec. 31, 2020 USD ($) property $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Aug. 04, 2021 $ / shares | Jul. 26, 2021 $ / shares | May 05, 2021 $ / shares | Mar. 25, 2021 $ / shares | Feb. 25, 2021 $ / shares | Jan. 27, 2021 $ / shares | Jan. 22, 2021 $ / shares | Jun. 01, 2020 $ / shares | May 20, 2020 $ / shares | Feb. 01, 2020 $ / shares | Jan. 14, 2019 $ / shares | Jan. 19, 2018 $ / shares | Jan. 18, 2018 $ / shares
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio | 0.3333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income from tenant reimbursements | $ |  |  |  |  | $ 1,703,974 |  | $ 1,538,586 |  |  | $ 3,395,361 | $ 3,899,505 |  |  | $ 7,028,808 | $ 4,857,794 |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expense | $ |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  | $ 607,787 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share (in usd per share) |  |  |  |  | $ (0.13) |  | $ (0.28) |  |  | $ (0.25) | $ (6.39) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends (in usd per share) |  |  |  |  | $ 0.2625 |  | $ 0.4080 |  |  | $ 0.5250 | $ 0.9330 |  |  | $ 1.4600 | $ 2.1105 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ |  |  | $ 129,118 | $ 113,362 | $ 2,508,471 | $ 129,118 |  |  | 113,362 | $ 2,508,471 |  | $ 129,118 |  | $ 129,118 | $ 113,362 |  |  |  |  |  |  |  |  |  |  |  |  |
Tenant reimbursements | $ |  |  | 60,598 | $ 98,329 | 189,136 | 60,598 |  |  | $ 98,329 | 189,136 |  | 60,598 |  | $ 60,598 | 98,329 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share in property owned |  |  |  |  |  |  |  |  |  |  |  |  |  | 72.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash to fund property tax | $ |  |  | 32,086 |  | 2,210,864 | 32,086 |  |  |  | 2,210,864 |  | 32,086 |  | $ 32,086 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties | $ |  |  |  |  | (400,999) | $ 761,100 | $ 349,457 | $ 9,157,068 |  | (400,999) | $ 9,506,525 |  |  | $ 10,267,625 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired real estate properties | property |  |  |  |  |  |  | 1 |  |  |  | 4 |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss | $ |  |  |  |  |  |  |  | 33,267,143 |  | 0 | $ 33,267,143 | $ 0 |  | $ 33,267,143 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets (excluding goodwill) | $ |  |  |  |  |  |  |  | $ 1,305,260 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill and intangible assets (Note 3) | $ |  |  | $ 0 |  | $ 0 |  | $ 0 |  |  | $ 0 | $ 34,572,403 |  |  | 34,572,403 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Related party fees incurred | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value (in usd per share) |  |  | $ 21.01 | $ 30.48 | $ 26.05 | $ 21.01 |  |  | $ 30.48 | $ 26.05 |  | $ 21.01 |  | $ 21.01 | $ 30.48 |  |  | $ 24.61 |  |  | $ 23.03 |  | $ 21.01 | $ 21.01 |  |  |  | $ 30.00
Stock repurchase program, shares authorized (in shares) | shares |  |  | 1,482,188 |  |  | 1,482,188 |  |  |  |  |  | 1,482,188 |  | 1,482,188 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segments |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DRP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.81 |  | $ 30.15 | $ 30.00
Net asset value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.48 |  |
Class M OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  | 1.6667 |  |  |  | 1.6667 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  |  | 657,949.5 |  |  |  |  | 657,949.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value (in usd per share) |  |  | $ 35.02 |  | $ 43.42 | $ 35.02 |  |  |  | $ 43.42 |  | $ 35.02 |  | $ 35.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class P OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6667 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  | 56,029 | 56,029 |  |  |  | 56,029 | 56,029 |  |  |  |  | 56,029 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  |  |  |  |  |  |  |  |  | 3 years |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  |  |  |  |  |  |  |  |  | 5 years |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased per month (as a percent) |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased per quarter (as a percent) |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased per year (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Building | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Building | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Improvement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tenant Improvement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tenant Improvement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lender Reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash to fund property tax | $ |  |  | $ 36,434 | $ 20,678 |  | $ 36,434 |  |  | $ 20,678 |  |  | $ 36,434 |  | $ 36,434 | $ 20,678 |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ |  |  | $ 92,684 | $ 92,684 | $ 2,400,000 | $ 92,684 |  |  | $ 92,684 | $ 2,400,000 |  | $ 92,684 |  | 92,684 | $ 92,684 |  |  |  |  |  |  |  |  |  |  |  |  |
BrixInvest | Class M OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  | 657,949.5 |  |  |  |  | 657,949.5 |  |  |  |  |  | 657,949.5 |  |  |  |  |  |  |  |  |  |  |  |  |
BrixInvest | Class P OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  | 26,318 |  |  |  |  | 26,318 |  |  |  |  |  | 26,318 |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursable organizational and offering expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party fees incurred | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,206,881 |  |  |  |  |  |  |  |  |  |  |  |  |
Due from BRIX REIT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party fees incurred | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsor | Reimbursable organizational and offering expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross offering proceeds, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock (in usd per share) | $ 0.001 | $ 0.003 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | (6.06) | (0.88) |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.46 | 2.11 |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, minimum holding period | 6 months |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for less than one year |  |  | 97.00% |  |  | 97.00% |  |  |  |  |  | 97.00% |  | 97.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for one to two years |  |  | 98.00% |  |  | 98.00% |  |  |  |  |  | 98.00% |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for two to three years |  |  | 99.00% |  |  | 99.00% |  |  |  |  |  | 99.00% |  | 99.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for at least three years |  |  | 100.00% |  |  | 100.00% |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for less than two years | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV shares held for at least two years | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock (in usd per share) | $ 0.001 | 0.003 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 |  |  | 0.001 | $ 0.001 |  | $ 0.001 |  | $ 0.001 | 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | (6.06) | $ (0.82) |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends (in usd per share) |  |  |  |  |  |  |  |  | $ 2.11 |  |  |  |  | $ 1.46 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio | 0.3333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value (in usd per share) | $ 23.03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26.05 | $ 24.61 |  | $ 23.03 | $ 21.01 | $ 23.03 | $ 21.01 |  |  |  |  |  |
Subsequent Event | Class C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock (in usd per share) | $ 0.001 | $ 0.003 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, minimum holding period | 6 months | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for less than one year |  | 97.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for one to two years |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for two to three years |  | 99.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for at least three years |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV, shares held for less than two years | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of NAV shares held for at least two years | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Class C | DRP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, minimum holding period | 6 months | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Class S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock (in usd per share) | $ 0.001 | $ 0.003 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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