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REAL ESTATE INVESTMENTS - Narrative (FY) (Details) |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) property state | Dec. 16, 2020 USD ($) | Oct. 29, 2020 USD ($) | Oct. 28, 2020 USD ($) | Sep. 16, 2020 USD ($) | Aug. 27, 2020 USD ($) | Aug. 03, 2020 USD ($) | Aug. 01, 2020 USD ($) | Apr. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) property | Jun. 30, 2021 USD ($) property state | Mar. 31, 2021 USD ($) lease | Dec. 31, 2020 USD ($) property state | Sep. 30, 2020 property | Jun. 30, 2020 USD ($) property | Mar. 31, 2020 USD ($) property | Apr. 30, 2020 USD ($) lease | Jun. 30, 2021 USD ($) property state | Dec. 31, 2020 USD ($) property lease state | Jun. 30, 2020 USD ($) property | Dec. 31, 2020 USD ($) property state | Dec. 31, 2019 USD ($) property
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property | 36 |  |  |  |  |  |  |  |  |  | 38 |  | 36 |  |  |  |  | 38 | 36 |  | 36 |
Number of states in which entity operates | state | 14 |  |  |  |  |  |  |  |  |  | 14 |  | 14 |  |  |  |  | 14 | 14 |  | 14 |
Number of real estate properties acquired | property | 0 |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |  |  | 0 | 0 | 0 | 0 |
Number of impaired real estate properties, vacant | property | 2 |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  | 2 |  |  | 2 |  | 2 |
Impairment of real estate investment properties |  |  |  |  |  |  |  |  |  |  | $ (400,999) |  | $ 761,100 |  | $ 349,457 | $ 9,157,068 |  | $ (400,999) |  | $ 9,506,525 | $ 10,267,625 | $ 0
Impairment charge percentage | 2.50% |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  | 0.10% | 2.20% |  |  | 2.50% | 0.10% | 2.50% |
Capitalized acquisition fees paid to Former Advisor |  |  |  |  |  |  |  |  |  | $ 5,459 |  |  |  |  |  |  |  |  |  |  |  | 5,459
Disposal group, including discontinued operation, consideration | $ 31,096,403 |  |  |  |  |  |  |  |  |  |  |  | $ 31,096,403 |  |  |  |  |  | $ 31,096,403 |  | $ 31,096,403 |
Proceeds from sale of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Lease termination fee |  |  | $ (1,350,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,039,648) | 0
Weighted average amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years 4 months 24 days |  |  | 9 years 4 months 24 days |
Number of properties classified as real estate held for sale | property | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  | (9) |
Number of real estate properties sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 5 |
REIT I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue of acquiree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
24 Hour Fitness | Mortgage Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly mortgage payment |  |  |  |  |  |  |  |  | $ 32,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in monthly mortgage payment |  |  |  |  |  |  |  |  | $ 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Taylor Fresh Foods |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized acquisition fees paid to Former Advisor |  |  |  |  |  |  |  |  |  | $ 741,000 |  |  |  |  |  |  |  |  |  |  |  | 741,000
Revenue of acquiree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 548,362
Dana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease termination fee |  |  |  |  |  |  |  | $ (1,381,767) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rent payments per month |  |  |  |  |  |  |  | $ 65,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tenant-in-common | Real Estate Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership (as a percent) | 72.70% |  |  |  |  |  |  |  |  |  | 72.70% |  | 72.70% |  |  |  |  | 72.70% | 72.70% |  | 72.70% |
REIT I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties acquired | property | 14 |  |  |  |  |  |  |  |  | 20 | 14 |  | 14 |  |  |  |  | 14 | 14 |  | 14 | 20
Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property | 11 |  |  |  |  |  |  |  |  |  | 12 |  | 11 |  |  |  |  | 12 | 11 |  | 11 |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  |  |  |  |  | $ 13,714,188 |  |  |  |  |  |  |  |  |  |
Number of properties classified as real estate held for sale | property | 4 |  |  |  |  |  |  |  |  | 3 |  |  | 3 | 2 | 3 |  |  |  |  |  | (8) |
Number of real estate properties sold | lease |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  | 4 |  |  |
Retail | 24 Hour Fitness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 5,664,517 |  |  |  | $ 5,664,517 | $ 5,664,517 |
Disposal group, including discontinued operation, consideration |  | $ 9,052,941 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate investments |  | $ 1,324,383 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retail | Rite Aid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 349,457 |  |  |  |  |  | 349,457 |
Disposal group, including discontinued operation, consideration | $ 7,250,000 |  |  |  |  |  | $ 7,250,000 |  |  |  |  |  | $ 7,250,000 |  |  |  |  |  | $ 7,250,000 |  | 7,250,000 |
Proceeds from sale of real estate investments |  |  |  |  |  |  | $ 3,299,016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retail | Walgreens Santa Maria and Stockbridge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate payment of lease incentives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 990,000 |  |  |  |  |
Number of operating leases with lease incentives | lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Retail | Walgreens |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating leases extension |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Retail | Walgreens Stockbridge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration | 5,538,462 |  |  |  |  | $ 5,538,462 |  |  |  |  |  |  | 5,538,462 |  |  |  |  |  | 5,538,462 |  | 5,538,462 |
Proceeds from sale of real estate investments |  |  |  |  |  | $ 5,296,356 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating leases extension |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Retail | Island Pacific Supermarket |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration | $ 3,155,000 |  |  |  | $ 3,155,000 |  |  |  |  |  |  |  | $ 3,155,000 |  |  |  |  |  | $ 3,155,000 |  | $ 3,155,000 |
Proceeds from sale of real estate investments |  |  |  |  | $ 1,124,016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retail | Chevron Gas Station |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties classified as real estate held for sale | property | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retail | Dollar General, Castalia and Lakeside |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties with leases extension | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Retail | REIT I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties acquired | property |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  | 5
Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property | 14 |  |  |  |  |  |  |  |  |  | 14 |  | 14 |  |  |  |  | 14 | 14 |  | 14 |
Office | REIT I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties acquired | property |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  | 4
Industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property | 11 |  |  |  |  |  |  |  |  |  | 12 |  | 11 |  |  |  |  | 12 | 11 |  | 11 |
Number of properties classified as real estate held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | (1) |
Number of real estate properties sold | lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Industrial | Dana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  | 2,184,395 | $ 2,184,395 |
Industrial | Rite Aid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 349,457 |  |  |  |  | 349,457 |  |
Industrial | Dinan Cars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  | $ 1,308,156 | 1,308,156 |
Disposal group, including discontinued operation, consideration | $ 6,100,000 |  |  | $ 6,100,000 |  |  |  |  |  |  |  |  | $ 6,100,000 |  |  |  |  |  | $ 6,100,000 |  | $ 6,100,000 |
Proceeds from sale of real estate investments |  |  |  | $ 3,811,580 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Industrial | REIT I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties acquired | property |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  | 5
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property | 1 |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 1 |  | 1 |

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- Definition Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of cash outflow for costs that are essential to originate the lease and would not otherwise have been incurred without the lease agreement. Amount includes, but is not limited to, cash outflows to evaluate the lessee's credit condition, guarantees, and collateral and cash outflows for costs incurred in negotiating, processing, and executing the lease agreement. + References No definition available. + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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