Short answer
Fannie's tiers reward lower-leverage, higher-coverage loans with tighter pricing. Freddie has a parallel structure with different definitions.
Sources
- Delegated Underwriting and Servicing (DUS) program disclosures · Fannie Mae · current
- Optigo lending program disclosures · Freddie Mac Multifamily · current
- Multifamily Market Commentary · Fannie Mae Economic & Strategic Research · 2026-Q1
