INCOME PROPERTIES - Acquisitions (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) ft² property tenant	Sep. 30, 2023 USD ($) ft² property tenant	Sep. 30, 2022 USD ($) ft² tenant	Feb. 24, 2023 ft²
Acquisitions of Income Properties
Weighted average amortization period of intangible assets		6 years
2023 Acquisitions
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs		$ 80.3
Land	$ 21.2	21.2
Buildings and improvements	53.6	53.6
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value	8.7	8.7
Intangible liabilities for below market lease value	$ 3.2	$ 3.2
Weighted average amortization period of intangible assets		5 years 7 months 6 days
Purchase Price		$ 80.0
2023 Acquisitions | Income Property, Multi-tenant, Rockwall, Texas
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs		$ 61.3
Property Square-Feet | ft²	446,500	446,500
Purchase Price		$ 61.2
Percentage Leased at Acquisition		95.00%
Remaining Lease Term at Acquisition Date (in years)		4 years 2 months 12 days
2023 Acquisitions | Income Property Exchange at Gwinnett, Buford, Georgia
Acquisitions of Income Properties
Number of real estate properties | property	4	4
Aggregate acquisition cost including capitalized acquisition costs		$ 14.7
Property Square-Feet | ft²	24,100	24,100		28,100
Purchase Price		$ 14.6
Number of tenant | tenant	6	6
Remaining Lease Term at Acquisition Date (in years)		9 years 10 months 24 days
2023 Acquisitions | Contract for acquisitions of remaining portion of Income Property Exchange at Gwinnett, Buford, Georgia
Acquisitions of Income Properties
Area of real estate property acquired | ft²	4,000	4,000
Purchase Price		$ 2.3
2023 Acquisitions | Income Property, Multi-tenant, Rockwall, Texas and Income Property Exchange at Gwinnett, Buford, Georgia
Acquisitions of Income Properties
Number of real estate properties | property	1	1
2023 Acquisitions | Income Property, Land Parcel, Adjacent Forsyth Property, Atlanta Georgia
Acquisitions of Income Properties
Number of real estate properties | property	1	1
Purchase Price	$ 4.3	$ 4.3
2022 Acquisitions
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs			$ 119.7
Weighted average amortization period of intangible assets			9 years
Purchase Price			$ 119.3
2022 Acquisitions | Multi-tenant
Acquisitions of Income Properties
Number of tenant repurchase options | tenant			2
2022 Acquisitions | Income Property, Multi-tenant, Ashford Lane, Atlanta, Georgia
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs			$ 80.5
Property Square-Feet | ft²			162,500
Purchase Price			$ 80.2
Percentage Leased at Acquisition			98.00%
Remaining Lease Term at Acquisition Date (in years)			10 years 4 months 24 days
2022 Acquisitions | Income Property, Multi-tenant, Katy, Texas
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs			$ 39.2
Land			35.4
Buildings and improvements			65.9
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value			19.7
Intangible liabilities for below market lease value			$ 1.3
Property Square-Feet | ft²			205,813
Purchase Price			$ 39.1
Percentage Leased at Acquisition			95.00%
Remaining Lease Term at Acquisition Date (in years)			5 years 8 months 12 days
2022 Acquisitions | Income Property, Multi-tenant, Katy, Texas | Fixed-Rate Mortgage Note
Acquisitions of Income Properties
Aggregate outstanding principal balance			$ 17.8