RENTALS UNDER OPERATING LEASES - Concentration Risk (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Property | Major Customers | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	67.10%	43.10%	66.40%	48.80%
Property | Major Customers | Percent of in-place annualized base rental revenues as of
Lessor, Lease, Description [Line Items]
Concentration risk percentage			15.10%	11.60%
Property | FedEx Ground - Seattle East Industrial | Percent of in-place annualized base rental revenues as of
Lessor, Lease, Description [Line Items]
Concentration risk percentage			15.10%	11.60%
Property | The Glenn, Centennial, CO | Major Customers | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	18.40%	19.10%	18.80%	16.70%
Property | Heritage Pkwy, Woodridge, IL | Major Customers | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	16.40%		14.80%
Property | Providence Square, Marietta, GA | Major Customers | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	11.60%	11.40%	11.60%	10.00%
Property | Seattle East Industrial, Redmond, WA | Major Customers | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	10.50%	10.10%	10.70%	9.10%
Property | Flats at Carrs Hill, Athens, GA | Major Customers | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	10.20%		10.50%
Property | Terra Nova, Chula Vista, CA | Major Customers | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage		2.50%		13.00%
Tenant | Major Customers | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	26.90%	10.40%	25.50%	19.90%
Tenant | Allstate Insurance Co. - Heritage Pkwy | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	16.40%		14.80%
Tenant | FedEx Ground - Seattle East Industrial | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage	10.50%	10.10%	10.70%	9.10%
Tenant | Bed Bath & Beyond, Inc - Terra Nova Plaza | Percent of property related income
Lessor, Lease, Description [Line Items]
Concentration risk percentage		0.30%		10.80%