DEBT - Summary of Total Secured Notes Payable Outstanding (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt issuance costs, net of accumulated amortization of $497 and $452, respectively	$ (1,620)	$ 0
Debt issuance costs, accumulated amortization	577	0
American Assets Trust, L.P. | Secured notes payable, net
Debt Instrument [Line Items]
Principal Balance	75,000	75,000
Debt issuance costs, net of accumulated amortization of $497 and $452, respectively	(377)	(422)
Total Notes Payable	74,623	74,578
Debt issuance costs, accumulated amortization	497	452
American Assets Trust, L.P. | 5.08% City Center Bellevue, October 2027 | Secured notes payable, net
Debt Instrument [Line Items]
Principal Balance	$ 75,000	$ 75,000
Stated Interest Rate	5.08%