medium · Asset-Backed Securities asset-nuances

A CMBS IO strip is considered 'rate-insensitive' compared to a residential MBS IO strip. Why?

  1. Commercial properties tend to generate materially more net operating income as rates rise, offsetting price declines in the strip.
  2. The CMBS IO strip's coupon is structured as a floating rate instrument that automatically resets in tandem with SOFR movements each period.
  3. Rating agencies formally mandate that all issuers must hedge every CMBS IO strip with interest rate swaps before the securitization deal can close.
  4. CMBS loans have prepayment protection (lockout, yield maintenance, or defeasance) that prevents rapid pool balance declines when rates fall.

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