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RECENT REAL ESTATE TRANSACTIONS (Disposals of Properties) (Details)					9 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 01, 2019 USD ($)	May 08, 2019 USD ($)	Jan. 15, 2019 USD ($)	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($) property	Dec. 31, 2018 USD ($)
Real Estate Properties [Line Items]
Mortgage notes issued for property acquired					$ 11,623,164		$ 0
The Presidio
Real Estate Properties [Line Items]
Proceeds from sale of property	$ 12,300,000
Gain (loss) on sale of property	$ 4,500,000
Genesis Plaza
Real Estate Properties [Line Items]
Proceeds from sale of property		$ 2,900,000
Sale of interest in property		43.00%
Sale of property		$ 5,600,000
Residential Properties
Real Estate Properties [Line Items]
Proceeds from sale of property			$ 875,000
Gain (loss) on sale of property			$ (93,000)
Residential Properties | Morena Office Center
Real Estate Properties [Line Items]
Proceeds from sale of property				$ 5,600,000
Gain (loss) on sale of property				$ 700,000
Residential Properties | Eighteen Dubose Model Homes
Real Estate Properties [Line Items]
No. of Properties | property					18
Purchase price of property acquired					$ 6,100,000
Cash payment for the properties acquired					1,800,000
Mortgage notes issued for property acquired					4,300,000
Residential Properties | Twenty-Six Dubose Model Homes
Real Estate Properties [Line Items]
Proceeds from sale of property					12,400,000
Gain (loss) on sale of property					$ 1,000,000
No. of Properties | property					35	39
Purchase price of property acquired						$ 15,200,000
Cash payment for the properties acquired						4,600,000
Mortgage notes issued for property acquired						10,600,000
Residential Properties | Thirteen Dubose Model Homes
Real Estate Properties [Line Items]
Proceeds from sale of property						9,000,000
Gain (loss) on sale of property						$ 795,000
No. of Properties | property						24

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