BBCMS Mortgage Trust 2023-C21 Appoints C-IV AM as Special Servicer

What Happened

• BBCMS Mortgage Trust 2023-C21 reported (Item 6.02) that C-IV Asset Management LLC (“C-IV AM”) will act as special servicer for the 11 West 42nd Street mortgage loan under the BANK5 2023-5YR3 pooling and servicing agreement. The change follows Greystone Servicing Company LLC’s sale on September 1, 2026 of substantially all assets of its special servicing division to C-IV AM, after which C-IV AM assumed the special servicer duties for matters arising after that closing. Substantially all key employees who performed Greystone’s special servicing duties transferred to C-IV AM and continue in similar roles. C-IV AM’s principal special servicing offices are in Irving, Texas.

Key Details

• Effective date: September 1, 2026 (sale/transfer of Greystone’s special servicing division to C-IV AM).
• Portfolio context: As of June 30, 2026 Greystone was named special servicer on ~60 transactions covering ~1,928 first‑lien loans with ~$20.7 billion aggregate principal; 33 were CMBS transactions (~774 loans, ~$14.2B). All of Greystone’s named portfolio (except two CLOs) transferred to C-IV AM.
• C-IV AM credentials: Morningstar DBRS rating “MOR CS2”; Fitch special servicer rating “CSS2”; on S&P’s Select Servicer list (U.S. Commercial Mortgage Special Servicer, “Average; Ranking Watch Positive”). Since 2002 C-IV AM (and predecessors) has resolved ~6,017 assets with ~$60.7 billion aggregate principal.
• Active special servicing: As of 6/30/2026 C-IV AM’s actively specially serviced portfolio was ~108 assets with ~ $2.1 billion stated principal; named specially serviced CMBS portfolio unpaid principal balance as of 6/30/2026 was ~$20,697.8 million.

Why It Matters

• For certificateholders, the special servicer handles troubled loans and workout or liquidation strategies; a change can affect the approach and timing of recoveries on the 11 West 42nd Street loan.
• The transfer preserves operational continuity (many former Greystone special servicing staff moved to C-IV AM) and C-IV AM’s industry ratings and long track record are facts investors can use to assess operational risk.
• The filing states no material legal proceedings against C-IV AM, no prior servicer defaults, and that C-IV AM does not expect its financial condition to materially affect its servicing performance — indicating the trustee/depositor view that the change should not materially harm pool performance.