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REAL ESTATE PROPERTIES - Summary, Acquisitions, Dispositions (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) ft² a | Dec. 31, 2022 USD ($) ft² a Integer shares | Dec. 31, 2021 USD ($) ft² a
Real Estate Companies Disclosures [Abstract] |  |  |  |
Land |  | $ 814,364,000 | $ 730,445,000 |
Buildings and building improvements |  | 3,336,615,000 | 3,012,319,000 |
Tenant and other improvements |  | 684,573,000 | 633,817,000 |
Right-of-Use Assets - Ground Leases (operating) | [1] | 17,996,000 | 19,391,000 |
Development and value-add properties | [2] | 639,647,000 | 538,449,000 |
Total real estate properties, gross |  | 5,493,195,000 | 4,934,421,000 |
Less accumulated depreciation |  | 1,273,723,000 | 1,150,814,000 |
Real estate investment property, Net |  | 4,219,472,000 | 3,783,607,000 |
Asset Acquisition [Abstract] |  |  |  |
Debt assumed in the purchase of real estate |  | $ 0 | $ 60,000,000 | $ 0
World Houston 23 |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² |  | 125,000 |  |
Date Sold |  | Mar. 31, 2023 |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 9,327,000 |  |
Basis |  | 4,518,000 |  |
Recognized Gain |  | $ 4,809,000 |  |
Ettie Business Center |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² |  | 29,000 |  |
Date Sold |  | Nov. 20, 2023 |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 11,638,000 |  |
Basis |  | 8,845,000 |  |
Recognized Gain |  | $ 2,793,000 |  |
Los Angeles Corporate Center [Member] |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² |  | 77,000 |  |
Date Sold |  | Dec. 29, 2023 |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 16,006,000 |  |
Basis |  | 5,643,000 |  |
Recognized Gain |  | $ 10,363,000 |  |
Metro Business Park [Member] |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² |  |  | 189,000 |
Date Sold |  |  | Jan. 06, 2022 |
Disposal Group, Including Discontinued Operation, Consideration |  |  | $ 32,851,000 |
Basis |  |  | 5,880,000 |
Recognized Gain |  |  | 26,971,000 |
Cypress Creek Business Park [Member] |  |  |  |
Real Estate Companies Disclosures [Abstract] |  |  |  |
Right-of-Use Assets - Ground Leases (operating) |  |  | $ 1,745,000 |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² | [3] |  | 56,000 |
Date Sold | [3] |  | Mar. 31, 2022 |
Disposal Group, Including Discontinued Operation, Consideration | [3] |  | $ 5,282,000 |
Basis | [3] |  | 1,901,000 |
Recognized Gain | [3] |  | 3,381,000 |
Operating Lease, Liability |  |  | $ 1,745,000 |
World Houston 15 East |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² |  |  | 42,000 |
Date Sold |  |  | May 11, 2022 |
Disposal Group, Including Discontinued Operation, Consideration |  |  | $ 12,873,000 |
Basis |  |  | 2,226,000 |
Recognized Gain |  |  | $ 10,647,000 |
Jetport Commerce Park [Member] |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² |  |  |  | 284,000
Date Sold |  |  |  | Nov. 09, 2021
Disposal Group, Including Discontinued Operation, Consideration |  |  |  | $ 44,260,000
Basis |  |  |  | 5,401,000
Recognized Gain |  |  |  | $ 38,859,000
2023 dispositions |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² |  | 231,000 |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 36,971,000 |  |
Basis |  | 19,006,000 |  |
Recognized Gain |  | $ 17,965,000 |  |
2022 Dispositions |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Size (square feet) | ft² |  |  | 287,000 |
Disposal Group, Including Discontinued Operation, Consideration |  |  | $ 51,006,000 |
Basis |  |  | 10,007,000 |
Recognized Gain |  |  | $ 40,999,000 |
2023 land dispositions |  |  |  |
Real Estate Properties |  |  |  |
Acres of real estate investment property | ft² |  | 11.9 |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 4,750,000 |  |
Recognized Gain |  | $ 446,000 |  |
Craig Corporate Center |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] | 156,000 |  |
Date acquired | [4] | Apr. 18, 2023 |  |
Costs | [4],[5] | $ 34,365,000 |  |
Blue Diamond Business Park |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] | 254,000 |  |
Date acquired | [4] | Sep. 05, 2023 |  |
Costs | [4],[5] | $ 52,973,000 |  |
McKinney Logistics Center |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] | 193,000 |  |
Date acquired | [4] | Oct. 02, 2023 |  |
Costs | [4],[5] | $ 25,739,000 |  |
Park at Myatt |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] | 171,000 |  |
Date acquired | [4] | Nov. 03, 2023 |  |
Costs | [4],[5] | $ 30,793,000 |  |
Pelzer Point Commerce Center I |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] | 213,000 |  |
Date acquired | [4] | Dec. 21, 2023 |  |
Costs | [4],[5] | $ 21,246,000 |  |
Cebrian Distribution Center and Reed Distribution Center |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4],[6] |  | 329,000 |
Date acquired | [4],[6] |  | Jun. 01, 2022 |
Costs | [4],[5],[6] |  | $ 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 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4],[6] |  | 1,377,000 |
Date acquired | [4],[6] |  | Jun. 01, 2022 |
Costs | [4],[5],[6] |  | $ 309,404,000 |
Cypress Preserve 1 & 2 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  | 516,000 |
Date acquired | [7] |  | Mar. 28, 2022 |
Costs | [5],[7] |  | $ 54,462,000 |
Zephyr Distribution Center |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  | 82,000 |
Date acquired | [7] |  | Apr. 08, 2022 |
Costs | [5],[7] |  | $ 29,017,000 |
Mesa Gateway Commerce Center |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  | 147,000 |
Date acquired | [7] |  | Apr. 15, 2022 |
Costs | [5],[7] |  | $ 18,315,000 |
Access Point 3 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  | 299,000 |
Date acquired | [7] |  | Jul. 12, 2022 |
Costs | [5],[7] |  | $ 21,127,000 |
Southpark Distribution Center 2 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] |  |  | 79,000
Date acquired | [4] |  |  | Jun. 10, 2021
Costs | [4],[5] |  |  | $ 9,177,000
DFW Global Logistics Centre |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] |  |  | 611,000
Date acquired | [4] |  |  | Aug. 26, 2021
Costs | [4],[5] |  |  | $ 89,829,000
Progress Center 3 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] |  |  | 50,000
Date acquired | [4] |  |  | Sep. 23, 2021
Costs | [4],[5] |  |  | $ 5,000,000
Texas Avenue Land |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] |  |  | 20,000
Date acquired | [4] |  |  | Oct. 15, 2021
Costs | [4],[5] |  |  | $ 4,143,000
Access Point 1 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  |  | 156,000
Date acquired | [7] |  |  | Jan. 15, 2021
Costs | [5],[7] |  |  | $ 10,501,000
Northpoint 200 [Member] |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  |  | 79,000
Date acquired | [7] |  |  | Jan. 21, 2021
Costs | [5],[7] |  |  | $ 6,516,000
Access Point 2 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  |  | 159,000
Date acquired | [7] |  |  | May 19, 2021
Costs | [5],[7] |  |  | $ 10,743,000
Cherokee 75 Business Center 2 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  |  | 105,000
Date acquired | [7] |  |  | Jun. 17, 2021
Costs | [5],[7] |  |  | $ 8,837,000
Siempre Viva 3-6 |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  |  | 547,000
Date acquired | [7] |  |  | Dec. 01, 2021
Costs | [5],[7] |  |  | $ 134,479,000
Tulloch corporation |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
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 |
2023 operating property acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] | 987,000 |  |
Costs | [4],[5] | $ 165,116,000 |  |
2023 value-add acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] | 0 |  |
Costs | [5],[7] | $ 0 |  |
2023 acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [8] | 987,000 |  |
Costs | [5],[8] | $ 165,116,000 |  |
2022 operating property acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] |  | 1,706,000 |
Costs | [4],[5] |  | $ 359,130,000 |
2022 value-add acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  | 1,044,000 |
Costs | [5],[7] |  | $ 122,921,000 |
2022 acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [8] |  | 2,750,000 |
Costs | [5],[8] |  | $ 482,051,000 |
2021 operating property acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [4] |  |  | 760,000
Costs | [4],[5] |  |  | $ 108,149,000
2021 value-add acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [7] |  |  | 1,046,000
Costs | [5],[7] |  |  | $ 171,076,000
2021 acquisitions |  |  |  |
Asset Acquisition [Abstract] |  |  |  |
Size (square feet) | ft² | [8] |  |  | 1,806,000
Costs | [5],[8] |  |  | $ 279,225,000
Development land |  |  |  |
Real Estate Properties |  |  |  |
Acres of real estate investment property | a |  | 328.3 | 456.3 | 365.8
Asset Acquisition [Abstract] |  |  |  |
Costs |  | $ 70,664,000 | $ 123,717,000 | $ 41,065,000
[1] | See Ground Leases discussion below for information regarding the Company’s right of use assets for ground leases.
[2] | Value-add properties are defined in Note 1(e).
[3] | Cypress Creek Business Park is located on a ground lease. In conjunction with the sale of the property, the Company fully amortized the associated right-of-use asset and liability of $1,745,000.
[4] | 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
[5] | 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.
[6] | 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.
[7] | Value-add properties are defined in Note 1(e).
[8] | Excludes acquired development land as detailed below.

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