N.Y.C. Admin. Code § 28-105.3: § 28-105.3 Separate permits required.

Separate work permits shall be required, as provided above, except that separate permits for foundations and earthwork, or for the installation or alteration of air conditioning systems, ventilation systems, and heating systems shall not be required whenever such work is included in and forms a part of the construction documents filed for the construction of a new building or the alteration of a building or structure.