N.Y. Educ. Law § 409-M
The board of education or trustees of every school district or, in the case of the city school district of New York, the chancellor, and every board of cooperative educational services, charter school and nonpublic school within the state shall develop policies and procedures requiring that all single-occupancy bathroom facilities are designated as gender neutral for use by no more than one occupant at a time or for family or assisted use. Such gender neutral bathroom facilities shall be clearly designated by the posting of such on or near the entry door of each facility. For purposes of this section, "single-occupancy bathroom" shall have the same meaning as paragraph (d) of subdivision one of section one hundred forty-five of the public buildings law.
N.Y. Educ. Law § 409-M