N.Y.C. Admin. Code § 28-304.7: § 28-304.7 Required contract.

The owner of all new and existing passenger elevators, freight elevators, and escalators shall have a contract with an approved elevator agency to perform elevator and escalator maintenance, repair and replacement work as defined by ASME A17.1 as modified by chapter K1 of appendix K of the New York city building code. The name, address and telephone number of such agency shall be maintained at each premises, on the mainline disconnect switch and in a location readily accessible to employees of the department and to maintenance and custodial staff at the premises.