NOTES AND BONDS PAYABLE (Schedule of Long-term Debt Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total Notes and Bond Payable principal outstanding	$ 1,106,377	$ 678,080
Net (Discount) / Premium on Notes and Bonds Payable	(2,851)	783
Deferred financing costs, net	(4,458)	(5,200)
Notes and Bond Payable, Net	1,099,068	673,663
Debt, outstanding amount	1,106,377
Mortgages \| Richardson Portfolio Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 35,832	36,000
Interest rate, effective percentage	2.64%
Debt, outstanding amount	$ 35,800
Mortgages \| Richardson Portfolio Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Mortgages \| Park Centre Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 26,185	21,970
Interest rate, effective percentage	1.89%
Mortgages \| Park Centre Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Mortgages \| 1180 Raymond Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 29,848	30,250
Interest rate, effective percentage	3.50%
Mortgages \| 1180 Raymond Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Mortgages \| 1180 Raymond Bond Payable
Debt Instrument [Line Items]
Bonds payable	$ 5,870	6,080
Contractual interest rate, percentage	6.50%
Interest rate, effective percentage	6.50%
Mortgages \| Pacific Oak SOR (BVI) Holdings, Ltd. Series A Debentures
Debt Instrument [Line Items]
Notes payable	$ 181,198	224,746
Contractual interest rate, percentage	4.25%
Interest rate, effective percentage	4.25%
Mortgages \| Pacific Oak SOR (BVI) Holdings, Ltd. Series B
Debt Instrument [Line Items]
Notes payable	$ 79,078	0
Contractual interest rate, percentage	3.93%
Interest rate, effective percentage	3.93%
Mortgages \| Crown Pointe Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 53,072	51,171
Interest rate, effective percentage	2.74%
Mortgages \| Crown Pointe Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.60%
Mortgages \| City Tower Mortgage Loan (4)
Debt Instrument [Line Items]
Notes payable	$ 94,167	89,000
Interest rate, effective percentage	1.69%
Mortgages \| City Tower Mortgage Loan (4) \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.55%
Mortgages \| The Marq Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 62,257	53,408
Interest rate, effective percentage	1.69%
Mortgages \| The Marq Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.55%
Mortgages \| Eight & Nine Corporate Centre Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 47,066	43,880
Interest rate, effective percentage	1.74%
Mortgages \| Eight & Nine Corporate Centre Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
Mortgages \| Georgia 400 Center Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 59,690	59,690
Interest rate, effective percentage	1.69%
Mortgages \| Georgia 400 Center Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.55%
Mortgages \| PORT Mortgage Loan 1
Debt Instrument [Line Items]
Notes payable	$ 51,362	51,362
Contractual interest rate, percentage	4.74%
Interest rate, effective percentage	4.74%
Mortgages \| PORT Mortgage Loan 2
Debt Instrument [Line Items]
Notes payable	$ 10,523	10,523
Contractual interest rate, percentage	4.72%
Interest rate, effective percentage	4.72%
Mortgages \| PORT Mortgage Loan 3
Debt Instrument [Line Items]
Notes payable	$ 12,000	0
Contractual interest rate, percentage	650.00%
Interest rate, effective percentage	6.50%
Mortgages \| Battery Point Trust Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 38,608	0
Interest rate, effective percentage	3.50%
Mortgages \| Battery Point Trust Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Mortgages \| Battery Point Trust Mortgage Loan \| One-month LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Mortgages \| Springmaid Beach Resort Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 57,015	0
Basis spread on variable rate	2.25%
Interest rate, effective percentage	5.75%
Mortgages \| Springmaid Beach Resort Mortgage Loan \| Secured Debt
Debt Instrument [Line Items]
Amount outstanding	$ 57,800
Unused borrowing capacity, amount	$ 9,600
Mortgages \| Springmaid Beach Resort Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Mortgages \| Q and C Hotel Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 25,000	0
Interest rate, effective percentage	4.50%
Mortgages \| Q and C Hotel Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Mortgages \| Lincoln Court Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 34,416	0
Interest rate, effective percentage	1.89%
Mortgages \| Lincoln Court Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Mortgages \| Lofts at NoHo Commons Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 74,536	0
Interest rate, effective percentage	3.93%
Mortgages \| Lofts at NoHo Commons Mortgage Loan \| Secured Debt
Debt Instrument [Line Items]
Amount outstanding	$ 74,500
Unused borrowing capacity, amount	$ 1,400
Mortgages \| Lofts at NoHo Commons Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.18%
Mortgages \| Lofts at NoHo Commons Mortgage Loan \| One-month LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Mortgages \| 210 West 31st Street Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 15,050	0
Interest rate, effective percentage	3.14%
Mortgages \| 210 West 31st Street Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Mortgages \| Oakland City Center Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 96,782	0
Contractual interest rate, percentage	6.00%
Interest rate, effective percentage	1.89%
Periodic payment	$ 110
Amortization schedule	30 years
Mortgages \| Oakland City Center Mortgage Loan \| Secured Debt
Debt Instrument [Line Items]
Amount outstanding	$ 97,100
Unused borrowing capacity, amount	$ 6,300
Mortgages \| Oakland City Center Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Mortgages \| Madison Square Mortgage Loan
Debt Instrument [Line Items]
Notes payable	$ 16,822	$ 0
Interest rate, effective percentage	5.05%
Mortgages \| Madison Square Mortgage Loan \| Secured Debt
Debt Instrument [Line Items]
Unused borrowing capacity, amount	$ 8,800
Debt, outstanding amount	$ 23,800
Mortgages \| Madison Square Mortgage Loan \| Maximum
Debt Instrument [Line Items]
Contractual interest rate, percentage	5.05%
Mortgages \| Madison Square Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	4.05%

Amortization schedule of mortgage loans on real estate.

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