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Mortgage Notes Payable (Parenthetical) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 15, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Real estate asset sold |  |  | $ 40,023,572 | $ 23,464,380
Morena Office Center [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed interest rate on mortgage (in hundredth) | [1],[2] |  | 4.30% |
Morena Office Center [Member] | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Real estate asset sold |  | $ 5,600,000 |  |
Grand Pacific Center [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate Terms |  |  | Interest rate is subject to reset on September 1, 2023. |
Fixed interest rate on mortgage (in hundredth) | [1],[3] |  | 4.02% |
Model Home Properties [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed interest rate on mortgage (in hundredth) |  |  | 3.80% |
Model Home Properties [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed interest rate on mortgage (in hundredth) |  |  | 5.60% |
World Plaza [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, variable interest rate basis |  |  | LIBOR |
Weighted average interest rate |  |  | 4.97% |
World Plaza [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable interest rate on mortgage (in hundredth) |  |  | 2.75% |
World Plaza [Member] | ABR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable interest rate on mortgage (in hundredth) |  |  | 0.75% |
[1] | Interest rates as of December 31, 2018.
[2] | Property held for sale as of December 31, 2018 and sold for $5.6 million on January 15, 2019.
[3] | Interest rate is subject to reset on September 1, 2023.

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