RENTAL INCOME (Commercial Leases) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) ft² item
RENTAL INCOME
Annual base rent for expiring leases | $	$ 2,972,087
Total square feet for expiring leases | ft²	108,043
Total number of leases expiring | item	46
Percentage of annual base rent for expiring leases	100.00%
Through December 31, 2018
RENTAL INCOME
Annual base rent for expiring leases | $	$ 499,878
Total square feet for expiring leases | ft²	19,724
Total number of leases expiring | item	14
Percentage of annual base rent for expiring leases	17.00%
Through December 31, 2019
RENTAL INCOME
Annual base rent for expiring leases | $	$ 576,710
Total square feet for expiring leases | ft²	20,838
Total number of leases expiring | item	11
Percentage of annual base rent for expiring leases	19.00%
Through December 31, 2020
RENTAL INCOME
Annual base rent for expiring leases | $	$ 185,494
Total square feet for expiring leases | ft²	4,461
Total number of leases expiring | item	6
Percentage of annual base rent for expiring leases	6.00%
Through December 31, 2021
RENTAL INCOME
Annual base rent for expiring leases | $	$ 829,156
Total square feet for expiring leases | ft²	40,323
Total number of leases expiring | item	6
Percentage of annual base rent for expiring leases	29.00%
Through December 31, 2022
RENTAL INCOME
Annual base rent for expiring leases | $	$ 486,772
Total square feet for expiring leases | ft²	12,218
Total number of leases expiring | item	6
Percentage of annual base rent for expiring leases	16.00%
Through December 31, 2023
RENTAL INCOME
Annual base rent for expiring leases | $	$ 157,443
Total square feet for expiring leases | ft²	4,771
Total number of leases expiring | item	1
Percentage of annual base rent for expiring leases	5.00%
Through December 31, 2024
RENTAL INCOME
Annual base rent for expiring leases | $	$ 94,184
Total square feet for expiring leases | ft²	1,858
Total number of leases expiring | item	1
Percentage of annual base rent for expiring leases	3.00%
Through December 31, 2025
RENTAL INCOME
Percentage of annual base rent for expiring leases	0.00%
Through December 31, 2026
RENTAL INCOME
Percentage of annual base rent for expiring leases	0.00%
Through December 31, 2027
RENTAL INCOME
Percentage of annual base rent for expiring leases	0.00%
Through December 31, 2028
RENTAL INCOME
Percentage of annual base rent for expiring leases	0.00%
Through December 31, 2029
RENTAL INCOME
Annual base rent for expiring leases | $	$ 142,450
Total square feet for expiring leases | ft²	3,850
Total number of leases expiring | item	1
Percentage of annual base rent for expiring leases	5.00%