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SEGMENTS (Net Operating Income by Segment) (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Net Operating Income [Abstract]    
Number of reportable segments | segment 3  
Rental income $ 27,467,410 $ 31,141,558
Total net operating income, as defined, for reportable segments 18,230,537 21,457,294
General and administrative expenses (5,268,315) (4,532,703)
Depreciation and amortization (7,364,688) (9,101,605)
Interest expense (10,649,646) (13,041,016)
Interest income 141,306 55,909
Gain on sale of real estate 6,319,272 12,200,138
Deferred offering costs 0 (1,507,599)
Impairment of real estate assets 0 (532,951)
Acquisition costs (24,269) (26,177)
Income tax expense (611,263) (518,567)
Net income 772,934 4,452,723
Office/Industrial Properties    
Net Operating Income [Abstract]    
Rental income 21,490,215 24,037,363
Property and related expenses (9,317,720) (9,494,885)
Total net operating income, as defined, for reportable segments 12,172,495 14,542,478
Model Home Properties    
Net Operating Income [Abstract]    
Rental income 4,194,489 4,642,159
Property and related expenses (193,367) (174,238)
Total net operating income, as defined, for reportable segments 4,001,122 4,467,921
Retail/Mixed Use Properties    
Net Operating Income [Abstract]    
Rental income 2,956,407 3,664,491
Property and related expenses (899,487) (1,217,596)
Total net operating income, as defined, for reportable segments $ 2,056,920 $ 2,446,895