2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)

11B-217.4.3 Building requirement.

TTYs in public buildings shall be provided in accordance with Section 11B-217.4.3.1. TTYs in private buildings shall be provided in accordance with Section 11B-217.4.3.2.

11B-217.4.3.1 Public buildings.

Where at least one public pay telephone is provided in a public building, at least one public TTY shall be provided in the building. Where at least one public pay telephone is provided in a public use area of a public building, at least one public TTY shall be provided in the public building in a public use area.

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.