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Mortgage Notes Payable (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 151,140,916 | $ 162,005,679
Unamortized loan costs |  | (1,426,740) | (1,682,942)
Mortgage notes payable, net |  | $ 149,714,176 | 160,322,737
Port of San Diego Complex [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [1] |  | 9,575,508
Fixed interest rate on mortgage (in hundredths) | [1],[2] | 4.75% |
Maturity date | [1] | Mar. 05, 2020 |
Garden Gateway Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,270,896 | 6,445,300
Fixed interest rate on mortgage (in hundredths) | [2] | 5.00% |
Maturity date |  | Apr. 05, 2020 |
World Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [3] | $ 3,350,539 |
Maturity date | [3] | Jul. 05, 2020 |
Variable interest rate on mortgage (in hundredths) | [2],[3] | 5.10% |
West Fargo Industrial [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 4,292,809 | 4,365,449
Fixed interest rate on mortgage (in hundredths) | [2] | 4.79% |
Maturity date |  | Sep. 06, 2020 |
Morena Office Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [4] | $ 1,567,358 | 2,156,479
Fixed interest rate on mortgage (in hundredths) | [2],[4] | 4.30% |
Maturity date | [4] | Jun. 01, 2021 |
Waterman Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 3,369,960 | 3,850,365
Fixed interest rate on mortgage (in hundredths) | [2] | 5.78% |
Maturity date |  | Apr. 29, 2021 |
Pacific Oaks Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [5] |  | 1,466,351
Fixed interest rate on mortgage (in hundredths) | [2],[5] | 4.30% |
Maturity date | [5] | Jun. 01, 2021 |
300 N.P. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 2,348,443 | 2,380,703
Fixed interest rate on mortgage (in hundredths) | [2] | 4.95% |
Maturity date |  | Jun. 11, 2022 |
Highland Court [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,568,320 | 6,695,541
Fixed interest rate on mortgage (in hundredths) | [2] | 3.82% |
Maturity date |  | Sep. 01, 2022 |
Dakota Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 10,314,520 | 10,492,904
Fixed interest rate on mortgage (in hundredths) | [2] | 4.74% |
Maturity date |  | Jul. 06, 2024 |
Union Terrace [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,354,153 | 6,454,448
Fixed interest rate on mortgage (in hundredths) | [2] | 4.50% |
Maturity date |  | Sep. 05, 2024 |
The Presidio [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 5,992,905 | 6,000,000
Fixed interest rate on mortgage (in hundredths) | [2] | 4.54% |
Maturity date |  | Dec. 01, 2021 |
Centennial Tech Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 9,745,811 | 9,908,235
Fixed interest rate on mortgage (in hundredths) | [2] | 4.43% |
Maturity date |  | Jan. 05, 2024 |
Arapahoe Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 8,233,567 | 8,364,088
Fixed interest rate on mortgage (in hundredths) | [2] | 4.34% |
Maturity date |  | Jan. 05, 2025 |
Research Parkway [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 1,864,139 | 1,909,012
Fixed interest rate on mortgage (in hundredths) | [2] | 3.94% |
Maturity date |  | Jan. 05, 2025 |
Union Town Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 8,440,000 | 8,440,000
Fixed interest rate on mortgage (in hundredths) | [2] | 4.28% |
Maturity date |  | Jan. 05, 2025 |
Yucca Valley Retail Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [6] |  | 6,000,000
Fixed interest rate on mortgage (in hundredths) | [2],[6] | 4.31% |
Maturity date | [6] | Apr. 11, 2025 |
Executive Office Park [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [7] | $ 4,947,808 | 4,151,161
Fixed interest rate on mortgage (in hundredths) | [2],[7] | 4.83% |
Maturity date | [7] | Jun. 01, 2027 |
Genesis Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,476,032 | 6,500,000
Fixed interest rate on mortgage (in hundredths) | [2] | 4.71% |
Maturity date |  | Aug. 25, 2025 |
One Park Centre [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,585,922 | 6,610,000
Fixed interest rate on mortgage (in hundredths) | [2] | 4.77% |
Maturity date |  | Sep. 05, 2025 |
Shea Center II [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 17,727,500 | 17,727,500
Fixed interest rate on mortgage (in hundredths) | [2] | 4.92% |
Maturity date |  | Jan. 05, 2026 |
Grand Pacific Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [8] | $ 3,961,304 | 4,057,752
Fixed interest rate on mortgage (in hundredths) | [2],[8] | 4.02% |
Maturity date | [8] | Aug. 01, 2037 |
Office/Industrial and Retail Properties [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 118,411,986 | 133,550,796
Model Home Properties [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 32,728,930 | $ 28,454,883
Model Home Properties [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 3.80% |
Maturity date |  | Jan. 01, 2019 |
Model Home Properties [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 5.60% |
Maturity date |  | Jan. 01, 2020 |
[1] | Port of San Diego Complex was sold on December 20, 2018.
[2] | Interest rates as of December 31, 2018.
[3] | Interest on this loan is ABR + 0.75% and LIBOR plus 2.75%. For the year-ended December 31, 2018, the weighted average interest rate was 4.97%.
[4] | Property held for sale as of December 31, 2018 and sold for $5.6 million on January 15, 2019.
[5] | Pacific Oaks Plaza was sold on December 27, 2018.
[6] | Yucca Valley Retail Center was sold on December 31, 2018.
[7] | The loan was refinanced to a new loan on June 1, 2018.
[8] | Interest rate is subject to reset on September 1, 2023.

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