N.Y.C. Admin. Code § 24-113: § 24-113 Display of work permits, certificates of operation, registrations and other notices.

Any work permit, certificate of operation or registration required by this code shall be prominently displayed in a manner visible to any person inspecting the equipment, and in the case of registration pursuant to section 24-109 of this code, shall be displayed in the vicinity of the premises designated on the registration.