N.Y. Lab. Law § 378

§ 378. Washrooms. Every mercantile establishment, every restaurant,\nevery office of a telegraph or messenger company in a city and every\nstation, terminal or car barn where women employees of a street,\nsurface, electric, subway or elevated railroad report for duty shall\nprovide and maintain for employees adequate and convenient washrooms or\nwashing facilities, separate for each sex wherever required by the rules\nof the board. Every washroom shall be adequately ventilated and heated\nand shall be lighted by artificial means where necessary.\n