2013 California Standards for Accessible Design Pocket Guide

11B-217.4.3.2 Private buildings.

Where four or more public pay telephones are provided in a private building, at least one public TTY shall be provided in the building.

Exception:  In a stadium or arena, in a convention center, in a hotel with a convention center or in a covered mall, if an interior public pay telephone is provided at least one interior public TTY shall be provided in the facility.