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Note 7 - Mortgage Notes Payable - Mortgage Notes Payable (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Mortgage Notes Payable, net |  | $ 120,029,696 | $ 142,392,992
Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | 120,788,005 | 143,459,049
Unamortized loan costs |  | (758,309) | (1,066,057)
Waterman Plaza [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [1],[2] | $ 3,207,952 | 3,274,097
Interest rate, variable | [1],[2],[3] | 4.25% |
Maturity date | [1],[2] | Apr. 29, 2021 |
World Plaza [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [2],[4] | $ 5,802,568 | 4,979,384
Interest rate, variable | [2],[3],[4] | 2.91% |
Maturity date | [2],[4] | Jul. 05, 2021 |
Garden Gateway Plaza [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [2] | $ 5,861,523 | 6,071,315
Maturity date | [2] | Aug. 05, 2021 |
Interest rate | [2],[3] | 5.00% |
The 300 N.P [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 2,273,478 | 2,311,739
Maturity date |  | Jun. 11, 2022 |
Interest rate | [3] | 4.95% |
Highland Court [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 6,274,815 | 6,424,366
Maturity date |  | Sep. 01, 2022 |
Interest rate | [3] | 3.82% |
Dakota Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 9,900,279 | 10,111,693
Maturity date |  | Jul. 06, 2024 |
Interest rate | [3] | 4.74% |
Union Terrace [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [5] | $ 0 | 6,240,396
Maturity date | [5] | Aug. 05, 2024 |
Interest rate | [3],[5] | 4.50% |
Centennial Tech Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [5] | $ 0 | 9,561,652
Maturity date | [5] | Dec. 05, 2024 |
Interest rate | [3],[5] | 4.43% |
Research Parkway [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 1,760,432 | 1,813,305
Maturity date |  | Jan. 05, 2025 |
Interest rate | [3] | 3.94% |
Arapahoe Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 7,932,255 | 8,085,727
Maturity date |  | Jan. 05, 2025 |
Interest rate | [3] | 4.34% |
Union Town Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 8,315,550 | 8,440,000
Maturity date |  | Jan. 05, 2025 |
Interest rate | [3] | 4.28% |
One Park Centre [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 6,385,166 | 6,487,532
Maturity date |  | Sep. 05, 2025 |
Interest rate | [3] | 4.77% |
Genesis Plaza [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 6,276,273 | 6,378,110
Maturity date |  | Sep. 06, 2025 |
Interest rate | [3] | 4.71% |
Shea Center II [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 17,727,500 | 17,727,500
Maturity date |  | Jan. 05, 2026 |
Interest rate | [3] | 4.92% |
Executive Office Park [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [2] | $ 2,985,998 | 4,839,577
Maturity date | [2] | Jun. 01, 2027 |
Interest rate | [2],[3] | 4.83% |
West Fargo Industrial [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 4,262,718 | 4,216,565
Maturity date |  | Aug. 05, 2029 |
Interest rate | [3] | 3.27% |
Grand Pacific Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [6] | $ 3,738,142 | 3,851,962
Maturity date | [6] | Aug. 01, 2037 |
Interest rate | [3],[6] | 4.02% |
Subtotal, Presidio Property Trust, Inc. Properties [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 92,704,649 | 110,814,920
Model Home [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [2],[7] | $ 28,083,356 | $ 32,644,129
Model Home [Member] | Mortgage Notes [Member] | Minimum [Member] |  |  |
Maturity date | [2],[7] | Dec. 31, 2023 |
Interest rate |  | 2.50% |
Model Home [Member] | Mortgage Notes [Member] | Maximum [Member] |  |  |
Maturity date | [2],[7] | Dec. 31, 2021 |
Interest rate |  | 5.60% |
[1] | Interest on this loan resets annually at LIBOR plus 3.00%, with a floor of 4.25%.
[2] | Properties held for sale as of December 31, 2020. Seven model homes were included as held for sale.
[3] | Interest rates as of December 31, 2020.
[4] | Interest on this loan is ABR + 0.75% and LIBOR plus 2.75%. For the year-ended December 31, 2020, the weighted average interest rate was 3.37%.
[5] | Property sold during the year ended December 31, 2020, see Footnote 3 above for further detail. One of four buildings at Executive Office Park were sold.
[6] | Interest rate is subject to reset on September 1, 2023.
[7] | Each Model Home has a stand-alone mortgage note at interest rates ranging from 2.5% to 5.6% at December 31, 2020.

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