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Note 7 - Mortgage Notes Payable - Mortgage Notes Payable (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Mortgage Notes Payable, net |  | $ 123,536,814 | $ 142,392,992
Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | 124,399,266 | 143,459,049
Unamortized loan costs |  | (862,452) | (1,066,057)
Waterman Plaza [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [1],[2] | $ 3,240,076 | 3,274,097
Interest rate, variable | [1],[2],[3] | 4.25% |
Maturity date | [1],[2] | Apr. 29, 2020 |
World Plaza [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [2],[4] | $ 5,828,395 | 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] | $ 5,914,955 | 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 |  | $ 2,283,380 | 2,311,739
Maturity date |  | Jun. 11, 2022 |
Interest rate | [3] | 4.95% |
Highland Court [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 6,312,739 | 6,424,366
Maturity date |  | Sep. 01, 2022 |
Interest rate | [3] | 3.82% |
Dakota Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 9,954,740 | 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 |  | $ 1,773,846 | 1,813,305
Maturity date |  | Jan. 05, 2025 |
Interest rate | [3] | 3.94% |
Arapahoe Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 7,971,736 | 8,085,727
Maturity date |  | Jan. 05, 2025 |
Interest rate | [3] | 4.34% |
Union Town Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 8,350,338 | 8,440,000
Maturity date |  | Jan. 05, 2025 |
Interest rate | [3] | 4.28% |
One Park Centre [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 6,411,646 | 6,487,532
Maturity date |  | Sep. 05, 2025 |
Interest rate | [3] | 4.77% |
Genesis Plaza [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable |  | $ 6,302,600 | 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] | $ 4,754,908 | 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 |  | $ 4,290,717 | 4,216,565
Maturity date |  | Aug. 05, 2029 |
Interest rate | [3] | 3.27% |
Grand Pacific Center [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [6] | $ 3,767,027 | 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 |  | $ 94,884,603 | 110,814,920
Model Home [Member] | Mortgage Notes [Member] |  |  |
Mortgage Notes Payable | [2],[7] | $ 29,514,663 | $ 32,644,129
Model Home [Member] | Mortgage Notes [Member] | Minimum [Member] |  |  |
Maturity date | [2],[7] | Dec. 31, 2020 |
Model Home [Member] | Mortgage Notes [Member] | Maximum [Member] |  |  |
Maturity date | [2],[7] | Dec. 31, 2023 |
[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 September 30, 2020. One of four buildings at Executive Office Park was classified as held for sale; one model home was included as held for sale.
[3] | Interest rates as of September 30, 2020.
[4] | Interest on this loan is ABR plus 0.75% and LIBOR plus 2.75%. For the nine months ended September 30, 2020, the weighted average interest rate was 3.53%.
[5] | Centennial Tech Center and Union Terrace were sold on February 5, 2020 and March 13, 2020, respectively.
[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 2.50% to 5.63% per annum at September 30, 2020.

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