SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)						1 Months Ended	6 Months Ended	12 Months Ended
	Dec. 20, 2024	Nov. 22, 2024	Nov. 08, 2022	Oct. 01, 2022 USD ($)	Sep. 30, 2022 USD ($)	Feb. 29, 2024 USD ($) investment_instrument	Jun. 30, 2023 $ / shares	Dec. 31, 2024 USD ($) executive_officer segment property director investment_instrument $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Oct. 11, 2024 USD ($)
Derivative [Line Items]
Impairment of real estate | $								$ 6,847,000	$ 45,459,000	$ 0
Gain (loss) on settlement of early terminated swaps | $								$ (6,552,000)	0	0
Dividend reinvestment plan, purchase price per share as percent of estimated value								95.00%
Write off of prepaid offering costs | $										$ 2,700,000
Restricted cash | $								$ 11,090,000	14,086,000
Due to affiliate | $								$ 19,520,000	$ 17,408,000
Antidilutive securities (in shares) | shares								0	0	0
Distributions declared per common share (in dollars per share)								$ 0		$ 0.598
Number of reportable segments | segment								1
O 2023 H1 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)									$ 0.230
O 2023 H2 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)									$ 0
O 2022 M1 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M12 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M11 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M10 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M9 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M8 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M7 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M6 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M5 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M4 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M3 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										0.04983333
O 2022 M2 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)										$ 0.04983333
O 2023 M1 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)							$ 0.03833333
O 2023 M6 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)							0.03833333
O 2023 M5 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)							0.03833333
O 2023 M4 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)							0.03833333
O 2023 M3 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)							0.03833333
O 2023 M2 Dividends
Derivative [Line Items]
Distributions declared per common share (in dollars per share)							$ 0.03833333
Carillon, 515 Congress, Gateway Tech Center, 201 17th Street, and Accenture Tower
Derivative [Line Items]
Debt instrument, asset management fees, percentage		0.90
Debt instrument, asset management fees, number of associated properties | property								5
Debt instrument, remaining of asset management fees, percentage		0.10
Accenture Tower
Derivative [Line Items]
Debt instrument, remaining of asset management fees, percentage	0.10
Advisor and Dealer Manager
Derivative [Line Items]
Incurred costs (reimbursement) | $								$ 20,859,000	$ 21,259,000	$ 20,427,000
Advisor and Dealer Manager | Related Party
Derivative [Line Items]
Due to affiliate | $								$ 19,520,000	17,408,000
Advisor and Dealer Manager | Monthly Asset Management Fee, Paid in Cash
Derivative [Line Items]
Incurred costs (reimbursement) | $				$ 1,150,000
Advisor and Dealer Manager | Fully Funded Bonus Retention Fund
Derivative [Line Items]
Incurred costs (reimbursement) | $				$ 8,500,000
Advisor and Dealer Manager | Fully Funded Bonus Retention Fund | Related Party
Derivative [Line Items]
Number of company executive officers | executive_officer								2
Number of company directors | director								1
Advisor and Dealer Manager | Bonus Retention Fund Deposit | Related Party
Derivative [Line Items]
Restricted cash | $								$ 8,500,000
Due to affiliate | $								8,500,000	8,500,000
Advisor and Dealer Manager | Payments from Bonus Retention Fund
Derivative [Line Items]
Incurred costs (reimbursement) | $								0
Advisor and Dealer Manager | Deferred Asset Management Fees
Derivative [Line Items]
Incurred costs (reimbursement) | $					$ 8,500,000
Advisor and Dealer Manager | Deferred Asset Management Fees | Related Party
Derivative [Line Items]
Due to affiliate | $								$ 8,500,000	8,500,000
Advisor and Dealer Manager | Non Compounded Return on Net Invested Capital
Derivative [Line Items]
Related party transaction, rate								8.00%
Advisor and Dealer Manager | The Renewal Advisory Agreement | Related Party
Derivative [Line Items]
Renewal period			1 year
Termination period			60 days
Advisor and Dealer Manager | Disposition fees
Derivative [Line Items]
Incurred costs (reimbursement) | $								$ 914,000	0	$ 0
Due to affiliate | $								500,000			$ 500,000
Advisor and Dealer Manager | Disposition fees | Carillon, 515 Congress, Gateway Tech Center, 201 17th Street, and Accenture Tower
Derivative [Line Items]
Selling commissions fees maximum reduction, percent of sales price		0.65%
Advisor and Dealer Manager | Disposition fees | Related Party
Derivative [Line Items]
Due to affiliate | $								$ 500,000	$ 0
KBS Capital Advisors LLC
Derivative [Line Items]
Monthly asset management fee, percent of acquisition expense, excluding acquisition fees related to thereto								0.0625%
KBS Capital Advisors LLC or Affiliates
Derivative [Line Items]
Disposition fees paid, percent of sales price								1.00%
Maximum | KBS Capital Advisors LLC, Affiliates or Unaffiliated Third Parties
Derivative [Line Items]
Disposition fees paid, percent of sales price								6.00%
Interest rate swaps | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, number of instruments terminated | investment_instrument						2		2
Gain (loss) on settlement of early terminated swaps | $						$ 6,600,000		$ 6,600,000