REAL ESTATE HELD FOR INVESTMENT (Narrative) (Details) ft² in Millions	Dec. 31, 2019 ft² a unit portfolio property investment
Real Estate Properties [Line Items]
Percentage of portfolio occupied	79.00%
Office Properties
Real Estate Properties [Line Items]
Number of real estate properties | property	6
Office Portfolio
Real Estate Properties [Line Items]
Number of real estate properties | portfolio	1
Office Buildings, Portfolio
Real Estate Properties [Line Items]
Number of real estate properties | property	4
Undeveloped Land, Portfolio
Real Estate Properties [Line Items]
Real estate area of undeveloped land | a	14
Rentable square feet | ft²	3.0
Residential Home Portfolio
Real Estate Properties [Line Items]
Number of real estate properties | portfolio	1
Rentable square feet | ft²	1.4
Percentage of portfolio occupied	89.00%
Number of units in real estate property | unit	993
Apartment Building
Real Estate Properties [Line Items]
Rentable square feet | ft²	0.3
Percentage of portfolio occupied	85.00%
Number of units in real estate property | unit	317
Number of real estate properties consolidated | property	1
Undeveloped Land
Real Estate Properties [Line Items]
Real estate area of undeveloped land | a	1,000
Number of investments in real estate | investment	3