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Note 7 - Mortgage Notes Payable - Mortgage Notes Payable (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Mortgage Notes Payable, net |  | $ 102,488,216 | $ 96,898,699
Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | 103,266,636 | 97,751,655
Unamortized loan costs |  | (778,420) | (852,956)
Mortgage Notes [Member] | Dakota Center [Member] |  |  |
Mortgage Notes Payable |  | $ 9,260,159 | 9,442,976
Interest rate | [1] | 4.74% |
Mortgage Notes [Member] | Research Parkway [Member] |  |  |
Mortgage Notes Payable |  | $ 1,603,836 | 1,648,237
Interest rate | [1] | 3.94% |
Mortgage Notes [Member] | Arapahoe Center [Member] |  |  |
Mortgage Notes Payable |  | $ 7,471,082 | 7,602,273
Interest rate | [1] | 4.34% |
Mortgage Notes [Member] | Union Town Center [Member] |  |  |
Mortgage Notes Payable |  | $ 7,910,038 | 8,025,300
Interest rate | [1] | 4.28% |
Mortgage Notes [Member] | One Park Centre [Member] |  |  |
Mortgage Notes Payable |  | $ 6,074,444 | 6,163,177
Interest rate | [1] | 4.77% |
Mortgage Notes [Member] | Genesis Plaza [Member] |  |  |
Mortgage Notes Payable |  | $ 5,967,580 | 6,055,682
Interest rate | [1] | 4.71% |
Mortgage Notes [Member] | Shea Center II [Member] |  |  |
Mortgage Notes Payable |  | $ 17,022,587 | 17,229,573
Interest rate | [1] | 4.92% |
Mortgage Notes [Member] | West Fargo Industrial [Member] |  |  |
Mortgage Notes Payable | [2] | $ 3,942,804 | 4,030,297
Interest rate | [1],[3] | 6.70% |
Mortgage Notes [Member] | Grand Pacific Center [Member] |  |  |
Mortgage Notes Payable | [4] | $ 3,806,187 | 3,496,330
Interest rate | [1],[2] | 6.35% |
Mortgage Notes [Member] | Baltimore [Member] |  |  |
Mortgage Notes Payable |  | $ 5,670,000 | 5,670,000
Interest rate | [1] | 4.67% |
Mortgage Notes [Member] | Mandolin [Member] |  |  |
Mortgage Notes Payable |  | $ 3,589,108 | 3,635,362
Interest rate | [1] | 4.35% |
Mortgage Notes [Member] | Subtotal, Presidio Property Trust, Inc. Properties [Member] |  |  |
Mortgage Notes Payable |  | $ 72,317,825 | 72,999,207
Mortgage Notes [Member] | Model Home [Member] |  |  |
Mortgage Notes Payable | [3] | $ 30,948,811 | $ 24,752,448
[1] | Interest rates as of September 30, 2023.
[2] | On August 5, 2023, the lender increased the interest rate to 6.70%. The loan agreement states that the lender may, upon not less than sixty (60) days prior, give written notice to the Company to increase the interest rate effective on August 5, 2023, and August 5, 2026, to the rate then being quoted by the lender for new three-year commercial mortgage loans of similar size and quality with like terms and security (provided that in no event shall the new rate be less than the initial rate).
[3] | As of September 30, 2023, there were seven model homes included as real estate assets held for sale. Our model homes have standalone mortgage notes at interest rates ranging from 2.50% to 7.12% per annum as of September 30, 2023.
[4] | On May 5, 2023, the Company, through its subsidiary, refinanced the mortgage loan on our Grand Pacific Center property and entered into a construction loan related to the tenant improvement associated with the KLJ Engineering LLC lease to occupy 33,296 square feet of the building. The refinanced loan is for approximately $3.8 million, a term of 10 years, with an interest rate of 6.35%, for the first 60 months. The interest rate is subject to reset in year five. The construction loan is for approximately $2.7 million, a term of 10 years, and will begin amortizing in year three, with an interest rate of 6.35%, for the first 60 months. The interest rate is subject to reset in year five. As of September 30, 2023, we had not drawn down on the construction loan.

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