2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
11B-217.4.2 Floor requirement.
TTYs in public buildings shall be provided in accordance with Section 11B-217.4.2.1. TTYs in private buildings shall be provided in accordance with Section 11B-217.4.2.2.
11B-217.4.2.1 Public buildings.
Where at least one public pay telephone is provided on a floor of a public building, at least one public TTY shall be provided on that floor.
11B-217.4.2.2 Private buildings.
Where four or more public pay telephones are provided on a floor of a private building, at least one public TTY shall be provided on that floor.
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