N.Y.C. Admin. Code § 28-118.3.1: § 28-118.3.1 Change of occupancy or use.

No building, open lot or portion thereof hereafter altered so as to change from one occupancy group to another, or from one zoning use group to another, either in whole or in part, shall be occupied or used unless and until the commissioner has issued a certificate of occupancy certifying that the alteration work for which the permit was issued has been completed substantially in accordance with the approved construction documents and the provisions of this code and other applicable laws and rules for the new occupancy or use.