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Mortgage Notes Payable (Scheduled Principal Payments of Mortgage Notes Payable) (Details)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2019 $ 13,402,299
2020 26,826,664
2021 21,937,819
2022 10,055,657
2023 10,928,130
Thereafter 67,990,347
Total 151,140,916
Office/Industrial Properties [Member]  
Debt Instrument [Line Items]  
2019 3,456,829
2020 15,231,332
2021 10,749,691
2022 10,055,657
2023 10,928,130
Thereafter 67,990,347
Total 118,411,986
Model Home Properties [Member]  
Debt Instrument [Line Items]  
2019 9,945,470
2020 11,595,332
2021 11,188,128
Total $ 32,728,930