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SEGMENTS (Assets) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Cash, cash equivalents and restricted cash	$ 8,982,679	$ 10,391,275	$ 12,839,227	$ 9,776,215
Other assets, net	3,999,350	5,709,586
TOTAL ASSETS	196,342,288	220,784,408
Significant Reconciling Items
Segment Reporting, Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	180,761,825	209,158,266
Cash, cash equivalents and restricted cash	1,730,789	1,591,041
Other assets, net	13,849,674	10,035,101
TOTAL ASSETS	196,342,288	220,784,408
Office/Industrial Properties | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	104,424,683	126,421,648
TOTAL ASSETS	105,759,056	131,180,612
Model Home properties | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	49,433,519	48,466,371
TOTAL ASSETS	48,298,760	51,389,400
Retail Use Properties | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	25,244,792	25,318,601
TOTAL ASSETS	$ 26,704,009	$ 26,588,254

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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