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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2021 $ / shares | Jan. 25, 2021 | Dec. 31, 2020 USD ($) $ / shares | Sep. 30, 2021 USD ($) $ / shares shares | Mar. 31, 2021 | Sep. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) property $ / shares | Jan. 31, 2021 $ / shares | Dec. 31, 2019 shares
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rental income from tenant reimbursements |  |  |  | $ 1,640,835 |  | $ 1,622,218 |  |  | $ 5,036,196 | $ 5,521,723 |  |
Impairment (reversal) of real estate |  |  |  | $ 0 |  | $ 0 | $ (349,457) | $ (9,157,068) | $ 0 | $ (9,506,525) |  |
Number of impaired real estate properties | property |  |  |  |  |  |  |  |  |  | 4 |  |
Conversion ratio | 0.3333 |  |  |  |  |  |  |  |  |  |  |
Weighted average diluted effect | shares |  |  |  | 1,219,316 |  |  |  |  | 1,188,099 |  |  |
Net income (loss) per share, basic (in usd per share) | $ / shares |  |  |  | $ 0.47 |  | $ (0.13) |  |  | $ 0.21 | $ (6.50) |  |
Net income (loss) per share, basic (in usd per share) | $ / shares |  |  |  | $ 0.40 |  | (0.13) |  |  | $ 0.18 | (6.50) |  |
Restricted cash |  |  | $ 129,118 | $ 2,410,951 |  |  |  |  | $ 2,410,951 |  |  |
Tenant reimbursements |  |  | 60,598 | 189,136 |  |  |  |  | $ 189,136 |  |  |
Restricted cash to fund property tax |  |  | 32,086 |  |  |  |  |  |  |  |  |
Restricted Cash, Leasing Commission |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash released |  |  |  | 128,538 |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  |  |  |  |  |  |  |  | 5 years |  |  |
Harley Davidson | Retail |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversal) of real estate |  |  | $ (632,233) |  |  |  |  |  |  |  |  |
Impairment reversal of real estate properties |  |  |  | 400,999 |  |  |  |  |  |  |  |
Northrop Grumman property |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  | 1,271,462 |  |  |  |  | $ 1,271,462 |  |  |
L3Harris |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  | $ 1,000,000 |  |  |  |  | $ 1,000,000 |  |  |
Class M OP Units |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  | 657,949.5 |  |  |  |  | 657,949.5 |  |  |
Conversion ratio |  |  |  |  | 1.6667 |  |  | 1 | 1.6667 |  |  |
Class P OP Units |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  | 56,029 |  |  |  |  | 56,029 |  |  | 56,029
Class R OP Units |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other ownership interests, units issued (in shares) | shares |  |  |  | 353,003 |  |  |  |  | 353,003 |  |  |
Units forfeited (in shares) | shares |  |  |  | 5,663 |  |  |  |  | 6,997 |  |  |
Conversion ratio |  | 1 |  |  |  |  |  |  |  |  |  |
Class M OP Unit OR Class P OP Unit |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion to class C units | shares |  |  |  | 0 |  |  |  |  | 0 |  |  |
Class C |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |  | $ 0.001 |  | $ 0.003 |
Conversion ratio |  |  |  |  |  |  |  | 1 | 1 |  |  |
Net income (loss) per share, basic (in usd per share) | $ / shares |  |  |  | 0.47 |  | (0.12) |  |  | $ 0.21 | (6.51) |  |
Net income (loss) per share, basic (in usd per share) | $ / shares |  |  |  | 0.40 |  | (0.12) |  |  |  | (6.51) |  |
Class S |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares | $ 0.001 |  | $ 0.001 | 0.001 |  |  |  |  | 0.001 |  | $ 0.003 |
Net income (loss) per share, basic (in usd per share) | $ / shares |  |  |  | 0.47 |  | (0.12) |  |  | 0.20 | (6.51) |  |
Net income (loss) per share, basic (in usd per share) | $ / shares |  |  |  | $ 0.47 |  | $ (0.12) |  |  | $ 0.20 | $ (6.51) |  |

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