A janitor is a person employed to render any physical service in connection with the maintenance, care or operation of a residential building. Where there is only one employee, such employee shall be deemed the janitor. Where there is more than one employee in the building, the employer shall designate an employee who lives in the building as the janitor. No building may have more than one janitor.
N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 141-3.4