N.Y.C. Admin. Code § 28-102.4.2: § 28-102.4.2 Change in use or occupancy.

Except as otherwise provided in sections 28-101.4.1, 28-101.4.2, 28-101.4.3 or 28-101.4.4, changes in the use or occupancy of any building or structure made after July 1, 2008 shall comply with the provisions of this code. Any changes made in the use or occupancy of a building or structure not in compliance with this code shall be prohibited and shall be a violation of this code. After a change in use or occupancy has been made in a building, the re-establishment of a prior use or occupancy that would not be lawful in a new building of the same construction class shall be prohibited unless and until all the applicable provisions of this code and other applicable laws and rules for such reestablished use or occupancy shall have been complied with. A change from a use prohibited by the provisions of this code, but which was permitted prior to July 1, 2008, to another use prohibited by the provisions of this code shall be deemed a violation of this code.