INCOME PROPERTIES - General Information (Details)						12 Months Ended
	Sep. 25, 2020 USD ($) ft²	Nov. 26, 2019 USD ($) property shares	Jul. 16, 2019 USD ($) Options	May 23, 2019 USD ($) ft²	Feb. 21, 2019 USD ($) ft²	Dec. 31, 2021 USD ($) ft² property shares	Dec. 31, 2020 USD ($) ft² property	Dec. 31, 2019 USD ($) property	Aug. 07, 2019 USD ($) a	Jun. 24, 2019 USD ($) ft²	Dec. 31, 2018 property
Acquisitions of Income Properties
Sales price						$ 162,300,000
Number of properties disposed for cash | property		15
Units issued | shares		1,223,854				823,878
Number of properties disposed for units | property		5
Stock Issuance						$ 357,000	$ 513,000	$ 532,000
Gain on sale of properties (in dollars per share)								20.60
Percentage of investment in PINE						6.30%
Gain (Loss) on Sale						$ 28,200,000
Payments for Tenant Improvements						5,041,000
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate						39,095,000	38,320,000	34,625,000
Aggregate outstanding principal balance						$ 38,099,000	37,735,000
Amount allocated of total acquisition cost
Weighted average amortization period of intangible assets						7 years 9 months 18 days
Weighted average amortization period of intangible liabilities						8 years 8 months 12 days
2021 Acquisitions
Acquisitions of Income Properties
Number of real estate properties | property						8
Payments to Acquire Commercial Real Estate						$ 249,050,000
Aggregate acquisition cost including capitalized acquisition costs						$ 249,800,000
Area of real estate property | ft²						1,111,491
Amount allocated of total acquisition cost
Weighted average amortization period of intangible assets						6 years 9 months 18 days
2020 Acquisitions
Acquisitions of Income Properties
Payments to Acquire Commercial Real Estate							185,135,000
Aggregate acquisition cost including capitalized acquisition costs							$ 185,700,000
Area of real estate property | ft²							751,210
Amount allocated of total acquisition cost
Weighted average amortization period of intangible assets							4 years 6 months
2020 Acquisitions, Multi-tenant
Acquisitions of Income Properties
Number of real estate properties | property							2
2020 Acquisitions, Single-tenant
Acquisitions of Income Properties
Number of real estate properties | property							2
2019 Acquisitions
Acquisitions of Income Properties
Payments to Acquire Commercial Real Estate								164,700,000
Aggregate acquisition cost including capitalized acquisition costs								165,700,000
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate								$ 16,300,000
Amount allocated of total acquisition cost
Weighted average amortization period of intangible assets								9 years 8 months 12 days
Weighted average amortization period of intangible liabilities						9 years 8 months 12 days
2019 Acquisitions, Multi-tenant
Acquisitions of Income Properties
Number of real estate properties | property								1
2019 Acquisitions, Single-tenant
Acquisitions of Income Properties
Number of real estate properties | property								10
Commercial loan and master lease investments
Acquisitions of Income Properties
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate						$ 39,095,000	$ 38,320,000
Aggregate outstanding principal balance						38,099,000	37,735,000
Commercial loan and master lease investments | 2020 Acquisitions
Acquisitions of Income Properties
Payments to Acquire Commercial Real Estate							21,000,000.0
2019 Dispositions, Income Properties
Acquisitions of Income Properties
Gain on sale of properties (in dollars per share)		$ 0.16
Gain (Loss) on Sale		1,000,000.0
Cocina 214
Acquisitions of Income Properties
Amount funded to tenants			$ 1,000,000.0
Collection of lease rent			300,000
Payments for Tenant Improvements			$ 700,000
Broken Hook LLC
Acquisitions of Income Properties
Lease term			10 years
Option to extend			true
Number of renewal options | Options			4
Renewal term			5 years
Ground Lease Loan - 400 Josephine Street, Austin, TX
Acquisitions of Income Properties
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate						17,189,000	16,827,000
Aggregate outstanding principal balance						16,250,000	$ 16,250,000
Lease Revenue - Billboards
Acquisitions of Income Properties
Number of real estate properties | property							9
Nonrecurring basis | 2021 Acquisitions
Acquisitions of Income Properties
Land						78,000,000.0
Buildings and improvements						124,900,000
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value						49,700,000
Intangible liabilities for below market lease value						$ 2,800,000
Nonrecurring basis | 2020 Acquisitions
Acquisitions of Income Properties
Land							$ 50,000,000.0
Buildings and improvements							94,600,000
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value							21,900,000
Intangible liabilities for below market lease value							1,800,000
Nonrecurring basis | 2019 Acquisitions
Acquisitions of Income Properties
Land								$ 45,600,000
Buildings and improvements								83,500,000
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value								23,400,000
Intangible liabilities for below market lease value								$ 3,100,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Acquisitions of Income Properties
Number of properties sold | property								21
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Income Property Subject To Lease Disposal Group2019 | Single-tenant
Acquisitions of Income Properties
Number of properties sold | property								21
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Income Property Subject To Lease Disposal Group2019 | Multi-tenant
Acquisitions of Income Properties
Number of properties sold | property											3
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2020 Dispositions, Income Properties and Land Parcels
Acquisitions of Income Properties
Sales price							86,500,000
Gain (Loss) on Sale							8,600,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2020 Dispositions, Income Properties
Acquisitions of Income Properties
Sales price							$ 85,979,000
Number of properties sold | property							11
Gain (Loss) on Sale							$ 8,509,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2020 Dispositions, Billboard Sites
Acquisitions of Income Properties
Sales price							$ 1,500,000
Number of properties sold | property							8
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2020 Dispositions, Land Parcels
Acquisitions of Income Properties
Number of properties sold | property							1
Florida
Acquisitions of Income Properties
Payments to Acquire Commercial Real Estate	$ 21,000,000.0
Area of real estate property | ft²	108,000
Alpine Income Property Trust, Inc.
Acquisitions of Income Properties
Units issued | shares						8,088
Stock Issuance						$ 100,000
Percentage of investment in PINE						15.60%
Alpine Income Property Trust, Inc. | OP Units
Acquisitions of Income Properties
Sales price		125,900,000
Stock Issuance		23,300,000
Percentage of investment in PINE						9.30%
Alpine Income Property Trust, Inc. | OP Units | 2019 Dispositions, Income Properties
Acquisitions of Income Properties
Stock Issuance		$ 15,500,000
Alpine Income Property Trust, Inc. | Common Stock | 2019 Dispositions, Income Properties
Acquisitions of Income Properties
Units issued | shares		815,790
Alpine Income Property Trust, Inc. | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2019 Dispositions, Income Properties, Single-tenant
Acquisitions of Income Properties
Number of properties in the disposal group | property		20
Income Property, Multi-tenant, The Grove, Wawa Outparcel, Winter Park, Florida | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2019 Dispositions, Income Properties
Acquisitions of Income Properties
Sales price									$ 2,800,000
Gain on sale of properties (in dollars per share)						$ 0.33
Area of real estate property | a									1.56
Gain (Loss) on Sale						2,100,000
Income Property, Multi-tenant, 3600 Peterson, Santa Clara, California | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2019 Dispositions, Income Properties
Acquisitions of Income Properties
Sales price										$ 37,000,000.0
Gain on sale of properties (in dollars per share)						1.36
Area of real estate property | ft²										76,000
Gain (Loss) on Sale						$ 9,000,000.0
Income Property, Multi-tenant, The Grove, Winter Park, Florida | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2019 Dispositions, Income Properties
Acquisitions of Income Properties
Sales price				$ 18,300,000
Gain on sale of properties (in dollars per share)				$ 0.42
Area of real estate property | ft²				112,000
Gain (Loss) on Sale				$ 2,800,000
Income Property, Multi-tenant, Whole Foods Market Centre, Sarasota, Florida | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2019 Dispositions, Income Properties
Acquisitions of Income Properties
Sales price					$ 24,600,000
Gain on sale of properties (in dollars per share)					$ 0.96
Area of real estate property | ft²					59,000
Gain (Loss) on Sale					$ 6,900,000