At least one accessible route shall connect each level that is open to the public, including mezzanines, in the following multilevel buildings and facilities:
- Group M occupancies;
- Health care providers, Group B or I occupancies;
- Nongovernment passenger transportation and airport facilities, Group A-3 or B occupancies; and
- Government facilities.
Exception: In air traffic control towers, an accessible route is not required to serve the cab and the floor immediately below the cab.