REAL ESTATE PROPERTIES - Summary (Details)		12 Months Ended
		Dec. 31, 2022 USD ($) ft² Integer shares	Dec. 31, 2021 USD ($) ft²	Dec. 31, 2020 USD ($) ft²
Real Estate Properties
Land		$ 730,445,000	$ 544,505,000
Buildings and building improvements		3,012,319,000	2,408,944,000
Tenant and other improvements		633,817,000	570,627,000
Development and value-add properties	[1]	538,449,000	504,614,000
Total real estate properties acquired		4,934,421,000	4,051,325,000
Less accumulated depreciation		1,150,814,000	1,035,617,000
Real Estate Investment Property, Net		3,783,607,000	3,015,708,000
Debt assumed in the purchase of real estate		$ 60,000,000	0	$ 0
Maximum occupancy at acquisition date that defines an investment property as value-add		75.00%
Minimum percentage of acquisition cost used in redevelopment costs that defines an investment property as value-add		20.00%
Real estate properties [Member]
Real Estate Properties
Right-of-Use Assets - Ground Leases (operating)	[2]	$ 19,391,000	$ 22,635,000
2022 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]	1,706,000
Costs	[3],[4]	$ 359,130,000
2022 Value-Add Property Acquisitions
Real Estate Properties
Size (square feet) | ft²	[5]	1,044,000
Costs	[4],[5]	$ 122,921,000
2022 Acquisitions
Real Estate Properties
Size (square feet) | ft²	[6]	2,750,000
Costs	[4],[6]	$ 482,051,000
2022 Acquisitions | Development land
Real Estate Properties
Purchase price		$ 123,717,000
Acres of real estate investment property | ft²		456.3
Locations of acquired property | Integer		10
2021 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]		760,000
Costs	[3],[4]		$ 108,149,000
2021 value-add properties acquired
Real Estate Properties
Size (square feet) | ft²	[5]		1,046,000
Costs	[4],[5]		$ 171,076,000
2021 acquisitions
Real Estate Properties
Size (square feet) | ft²	[6]		1,806,000
Costs	[4],[6]		$ 279,225,000
2020 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]			347,000
Costs	[3],[4]			$ 48,656,000
2020 value-add properties acquired
Real Estate Properties
Size (square feet) | ft²	[5]			162,000
Costs	[4],[5]			$ 27,862,000
2020 Acquisitions [Member]
Real Estate Properties
Size (square feet) | ft²	[6]			509,000
Costs	[4],[6]			$ 76,518,000
Tulloch corporation
Real Estate Properties
Number of land parcels acquired | Integer		2
Debt assumed in the purchase of real estate		$ 60,000,000
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued | shares		1,868,809
Fair value of loans assumed, asset acquisition		$ 60,000,000
Other Significant Noncash Transaction, Fair Value of Consideration Given, Common shares issued		$ 303,756,000
Cebrian Distribution Center and Reed Distribution Center | 2022 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3],[7]	329,000
Date acquired	[3],[7]	Jun. 01, 2022
Costs	[3],[4],[7]	$ 49,726,000
6th Street Bus Cntr, Benicia Distrib Cntr 1-5, Ettie Bus Cntr, Laura Alice Bus Cntr, Preston Distrb Cntr, Sinclair Distrib Cntr, Transit Distrb Cntr and Whipple Bus Cntr | 2022 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3],[7]	1,377,000
Date acquired	[3],[7]	Jun. 01, 2022
Costs	[3],[4],[7]	$ 309,404,000
Cypress Preserve 1 & 2 | 2022 Value-Add Property Acquisitions
Real Estate Properties
Size (square feet) | ft²	[5]	516,000
Date acquired	[5]	Mar. 28, 2022
Costs	[4],[5]	$ 54,462,000
Zephyr Distribution Center | 2022 Value-Add Property Acquisitions
Real Estate Properties
Size (square feet) | ft²	[5]	82,000
Date acquired	[5]	Apr. 08, 2022
Costs	[4],[5]	$ 29,017,000
Mesa Gateway Commerce Center | 2022 Value-Add Property Acquisitions
Real Estate Properties
Size (square feet) | ft²	[5]	147,000
Date acquired	[5]	Apr. 15, 2022
Costs	[4],[5]	$ 18,315,000
Access Point 3 | 2022 Value-Add Property Acquisitions
Real Estate Properties
Size (square feet) | ft²	[5]	299,000
Date acquired	[5]	Jul. 12, 2022
Costs	[4],[5]	$ 21,127,000
Southpark Distribution Center 2 | 2021 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]		79,000
Date acquired	[3]		Jun. 10, 2021
Costs	[3],[4]		$ 9,177,000
DFW Global Logistics Centre | 2021 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]		611,000
Date acquired	[3]		Aug. 26, 2021
Costs	[3],[4]		$ 89,829,000
Progress Center 3 | 2021 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]		50,000
Date acquired	[3]		Sep. 23, 2021
Costs	[3],[4]		$ 5,000,000
Texas Avenue | 2021 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]		20,000
Date acquired	[3]		Oct. 15, 2021
Costs	[3],[4]		$ 4,143,000
Access Point 1 | 2021 value-add properties acquired
Real Estate Properties
Size (square feet) | ft²	[5]		156,000
Date acquired	[5]		Jan. 15, 2021
Costs	[4],[5]		$ 10,501,000
Northpoint 200 [Member] | 2021 value-add properties acquired
Real Estate Properties
Size (square feet) | ft²	[5]		79,000
Date acquired	[5]		Jan. 21, 2021
Costs	[4],[5]		$ 6,516,000
Access Point 2 | 2021 value-add properties acquired
Real Estate Properties
Size (square feet) | ft²	[5]		159,000
Date acquired	[5]		May 19, 2021
Costs	[4],[5]		$ 10,743,000
Cherokee 75 Business Center 2 | 2021 value-add properties acquired
Real Estate Properties
Size (square feet) | ft²	[5]		105,000
Date acquired	[5]		Jun. 17, 2021
Costs	[4],[5]		$ 8,837,000
Siempre Viva 3-6 | 2021 value-add properties acquired
Real Estate Properties
Size (square feet) | ft²	[5]		547,000
Date acquired	[5]		Dec. 01, 2021
Costs	[4],[5]		$ 134,479,000
Wells Point One | 2020 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]			50,000
Date acquired	[3]			Feb. 28, 2020
Costs	[3],[4]			$ 6,231,000
Cherokee 75 Business Center 1 | 2020 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]			85,000
Date acquired	[3]			Dec. 15, 2020
Costs	[3],[4]			$ 8,323,000
The Rock at Star Business Park | 2020 operating properties acquired
Real Estate Properties
Size (square feet) | ft²	[3]			212,000
Date acquired	[3]			Dec. 17, 2020
Costs	[3],[4]			$ 34,102,000
Rancho Distribution Center | 2020 value-add properties acquired
Real Estate Properties
Size (square feet) | ft²	[5]			162,000
Date acquired	[5]			Oct. 15, 2020
Costs	[4],[5]			$ 27,862,000
Speed Distribution Center
Real Estate Properties
Size (square feet) | ft²			519,000
Percentage of joint venture owned and controlled (after acquisition of noncontrolling interest)		100.00%
Asset Acquisition, Consideration Transferred, Transaction Cost		$ 18,599,000
Noncontrolling interest, ownership percentage acquired		1.00%

[1] Value-add properties are defined as properties that are either acquired but not stabilized or can be converted to a higher and better use.  Acquired properties meeting either of the following two conditions are considered value-add properties:  (1) Less than 75% occupied as of the acquisition date (or will be less than 75% occupied within one year of acquisition date based on near term lease roll), or (2) 20% or greater of the acquisition cost will be spent to redevelop the property.

[2] See Ground Leases discussion below for information regarding the Company’s right of use assets for ground leases.

[3] Operating properties are defined as stabilized real estate properties (land including buildings and improvements) in the Company’s operating portfolio; included in Real estate properties on the Consolidated Balance Sheets

[4] Cost is calculated in accordance with FASB ASC 805, Business Combinations, and represents the sum of the purchase price, closing costs and capitalized acquisition costs.

[5] Value-add properties are defined in Note 2.

[6] Excludes acquired development land as detailed below.

[7] The Company acquired these operating properties along with two land parcels, also in Sacramento, CA and San Francisco, CA, in connection with its acquisition of Tulloch Corporation in June 2022. Size and cost are presented on an aggregate basis for the properties located in Sacramento, CA and San Francisco, CA, respectively. In consideration for this acquisition, the Company assumed a $60,000,000 loan and issued 1,868,809 shares of the Company’s common stock. The acquisition date fair value of the loan assumed was $60,000,000, and the acquisition date fair value of the common shares, which was based on the closing share price on the acquisition date, was $303,756,000.