Benchmark 2018-B4 Mortgage Trust 8-K

What Happened
Benchmark 2018-B4 Mortgage Trust filed an 8-K on April 14, 2026 announcing that Situs Holdings, LLC resigned as special servicer for the Aon Center Mortgage Loan and Argentic Services Company LP (“Argentic”) has been appointed successor special servicer under the JPMCC 2018-AON Trust and Servicing Agreement (dated June 29, 2018). The Aon Center Mortgage Loan represented approximately 4.3% of the issuing entity’s asset pool as of the cut-off date.

Key Details

• Effective date of change: April 14, 2026.
• Aon Center Mortgage Loan size: ~4.3% of the trust’s asset pool (as of cut-off date).
• Servicing authority: appointment made pursuant to Section 6.4(a) of the JPMCC 2018-AON Trust and Servicing Agreement.
• Successor special servicer: Argentic Services Company LP (office: 500 North Central Expressway, Suite 261, Plano, TX 75074; phone: 469-609-2000). Situs Holdings, LLC resigned as special servicer.

Why It Matters
Special servicers manage loans that require additional oversight, workouts, or enforcement. The filing records who will perform those duties for the Aon Center Mortgage Loan if special servicing becomes necessary; it does not itself report a default, modification, or workout of the loan. Investors in the trust should note the servicer change for monitoring loan performance and related servicing communications.