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SEGMENTS (Assets) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	$ 209,158,266	$ 220,186,759
Cash and cash equivalents	10,391,275	9,776,215	$ 8,310,575
Other assets, net	5,709,586	7,646,207
TOTAL ASSETS	220,784,408	233,050,040
Significant Reconciling Items
Segment Reporting, Asset Reconciling Item [Line Items]
Other assets, net	1,234,867	3,087,066
Office/Industrial Properties | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	126,421,648	138,694,773
TOTAL ASSETS	131,180,612	143,620,315
Model Home Properties | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	48,466,371	48,762,869
TOTAL ASSETS	51,389,400	48,864,060
Retail/Mixed Use Properties | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Land, buildings and improvements, net	25,318,601	23,650,423
TOTAL ASSETS	$ 26,588,254	$ 27,702,384

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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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