N.Y.C. Admin. Code § 28-207.1: § 28-207.1 Contents and service.

Peremptory orders issued by the commissioner shall contain a description of the building, structure, premises, equipment or subject matter affected, and shall be designated by address where applicable. Such orders may be served personally or by posting at the premises followed by regular mail, by any officer or employee of the department, or by any person authorized by the commissioner.