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MERGER AND SELF-MANAGEMENT TRANSACTION - Narrative (FY) (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2021 $ / shares | Dec. 31, 2015 $ / shares shares | Jun. 24, 2015 shares | Jun. 30, 2021 USD ($) property $ / shares shares | Jun. 30, 2020 USD ($) property | Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) property $ / shares shares | Jun. 30, 2020 USD ($) property | Dec. 31, 2015 $ / shares shares | Dec. 31, 2020 USD ($) property $ / shares | Dec. 31, 2020 USD ($) property $ / shares | Dec. 31, 2019 USD ($) property $ / 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 | Apr. 30, 2020 | Jan. 18, 2018 $ / shares | Jun. 23, 2015 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties acquired | property |  |  |  | 0 | 0 |  | 0 | 0 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio | 0.3333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value (in usd per share) | $ / shares |  |  |  | $ 26.05 |  |  | $ 26.05 |  |  | $ 21.01 | $ 21.01 | $ 30.48 |  |  | $ 24.61 |  |  | $ 23.03 |  | $ 21.01 | $ 21.01 |  | $ 30.00 |
Self-management transaction expense |  |  |  |  |  |  |  |  |  |  | $ 201,920 | $ 1,468,913 |  |  |  |  |  |  |  |  |  |  |  |
Decrease in estimated fair value of real estate properties, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  |
Goodwill impairment loss |  |  |  |  |  | $ 33,267,143 | $ 0 | $ 33,267,143 |  | $ 0 | 33,267,143 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization expense |  |  |  | $ 465,595 | $ 438,770 |  | 925,739 | 925,989 |  |  | $ 1,833,054 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets (excluding goodwill) |  |  |  |  |  | 1,305,260 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  | 1,877,826 |  |  | 1,877,826 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 |  |  |  | 787,228 |  |  | 787,228 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 |  |  |  | $ 709,832 |  |  | $ 709,832 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class M OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  | 1.6667 |  |  |  | 1.6667 | 1 |  |  |  |  |  |  |  |  |  |  |  |
Net asset value (in usd per share) | $ / shares |  |  |  | $ 43.42 |  |  | $ 43.42 |  |  | $ 35.02 | $ 35.02 |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  | 657,949.5 |  |  | 657,949.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class P OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  | 1.6667 |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  | 56,029 |  |  | 56,029 |  |  |  |  | 56,029 |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  | $ 88,783 | $ 88,784 |  | $ 177,567 | $ 177,567 |  |  | $ 355,133 |  |  |  |  |  |  |  |  |  |  |  |  |
BrixInvest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution of Class M OP Units and Class P OP Units |  |  |  |  |  |  |  |  |  |  |  | $ 50,603,000 |  |  |  |  |  |  |  |  |  |  |  |
Self-management transaction expense |  |  |  |  |  |  |  |  |  |  | 201,920 | 1,468,913 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  |  |  |  |  | $ 1,840,576 | 1,840,576 |  |  |  |  |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  |  |  |  |  | 1,840,576 | 1,840,576 |  |  |  |  |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  |  |  |  |  | 749,978 | 749,978 |  |  |  |  |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  |  |  |  |  | 696,658 | 696,658 |  |  |  |  |  |  |  |  |  |  |  |  |
BrixInvest | Class M OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 657,949.5 |  |  |  |  |  |  |  |  |  |  |  |
BrixInvest | Class P OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 26,318 |  |  |  |  |  |  |  |  |  |  |  |
BrixInvest | Investor list, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets (excluding goodwill) |  |  |  |  |  | $ 1,305,260 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
BrixInvest | Web services technology, domains and licenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional finite-lived intangible assets acquired |  |  |  |  |  |  |  |  |  |  | 566,102 |  |  |  |  |  |  |  |  |  |  |  |  |
Daisho OP Holdings, LLC | Class M OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Daisho OP Holdings, LLC | BrixInvest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interests distributed |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Operating Partnership | Class M OP Units and Class P OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 13.00% |  |  |  |  |  |  |  |  |  |  |  |
Messrs. Halfacre and Pacini | Class P OP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 29,711 |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, capital account |  |  |  | $ 976,618 |  |  | $ 976,618 |  |  | $ 1,154,186 | $ 1,154,186 | $ 1,509,319 |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, amortization period |  |  |  |  |  |  | 51 months |  |  |  | 51 months |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in offering (in shares) | shares |  | 3,333.3 | 3,333.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in usd per share) | $ / shares |  | $ 30.00 |  |  |  |  |  |  | $ 30.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.00
REIT I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 4.80% |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio | 0.3333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value (in usd per share) | $ / shares | $ 23.03 |  |  |  |  |  |  |  |  |  |  |  | $ 26.05 | $ 24.61 |  | $ 23.03 | $ 21.01 | $ 23.03 | $ 21.01 |  |  |  |  |
Class C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  | 1 |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Class C | Sponsor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in offering (in shares) | shares |  |  |  |  |  |  |  |  | 6,666.7 |  |  | 3,580 |  |  |  |  |  |  |  |  |  |  |  |
REIT I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties acquired | property |  |  |  | 14 |  |  | 14 |  |  | 14 | 14 | 20 |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties, subject to California law | property |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of assets acquired by value, subject to California law |  |  |  |  |  |  |  |  |  |  |  | 93.00% |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration paid |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related transaction costs |  |  |  |  |  |  |  |  |  |  |  | $ 3,044,480 |  |  |  |  |  |  |  |  |  |  |  |
REIT I | Class C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in merger (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 2,680,740.5 |  |  |  |  |  |  |  |  |  |  |  |

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