NOTES AND BOND PAYABLE - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total Notes and Bonds Payable principal outstanding	$ 704,567	$ 678,080
Net Premium/(Discount) on Notes and Bonds Payable	757	783
Deferred financing costs, net	(6,636)	(5,200)
Notes and Bond Payable, Net	698,688	673,663
Mortgages \| Richardson Portfolio Mortgage Loan
Debt Instrument [Line Items]
Notes payable, net	$ 36,000	36,000
Interest rate, effective percentage	3.49%
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, net	$ 21,970	21,970
Interest rate, effective percentage	2.74%
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, net	$ 30,150	30,250
Interest rate, effective percentage	3.24%
Mortgages \| 1180 Raymond Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Mortgages \| 1180 Raymond Bond Payable
Debt Instrument [Line Items]
Bonds payable	$ 6,030	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, net	$ 164,065	224,746
Contractual interest rate, percentage	4.25%
Interest rate, effective percentage	4.25%
Mortgages \| Pacific Oak SOR (BVI) Holdings, Ltd. Series B Debentures
Debt Instrument [Line Items]
Notes payable, net	$ 71,601	0
Contractual interest rate, percentage	3.93%
Interest rate, effective percentage	3.93%
Mortgages \| Crown Pointe Mortgage Loan
Debt Instrument [Line Items]
Notes payable, net	$ 53,612	51,171
Interest rate, effective percentage	3.59%
Mortgages \| Crown Pointe Mortgage Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.60%
Mortgages \| City Tower Mortgage Loan
Debt Instrument [Line Items]
Notes payable, net	$ 94,167	89,000
Interest rate, effective percentage	2.54%
Mortgages \| City Tower Mortgage Loan \| 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, net	$ 58,331	53,408
Interest rate, effective percentage	2.54%
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, net	$ 47,066	43,880
Interest rate, effective percentage	2.59%
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, net	$ 59,690	59,690
Interest rate, effective percentage	2.54%
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, net	$ 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, net	$ 10,523	$ 10,523
Contractual interest rate, percentage	4.72%
Interest rate, effective percentage	4.72%

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Notes and Bond Payable, Net

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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