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Mortgage Notes Payable (Scheduled Principal Payments of Mortgage Notes Payable) (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2017 $ 774,370 $ 3,771,756
2018 3,651,695 7,366,855
2019 18,982,595 19,917,067
2020 33,158,618 5,066,806
2021 14,496,465 12,081,874
Thereafter 93,637,314 112,624,246
Total 164,701,057 160,828,604
Presidio Property Trust, Inc. [Member]    
Debt Instrument [Line Items]    
2017 474,791 1,927,307
2018 1,931,368 6,213,089
2019 2,286,504 3,153,040
2020 21,156,934 2,569,269
2021 14,496,465 12,081,874
Thereafter 93,637,314 112,624,246
Total 133,983,376 138,568,825
Model Home [Member]    
Debt Instrument [Line Items]    
2017 299,579 1,844,449
2018 1,720,327 1,153,766
2019 16,696,091 16,764,027
2020 12,001,684 2,497,537
Total $ 30,717,681 $ 22,259,779