N.Y.C. Admin. Code § 28-118.3.2: § 28-118.3.2 Changes inconsistent with existing certificate of occupancy.

No change shall be made to a building, open lot or portion thereof inconsistent with the last issued certificate of occupancy or, where applicable, inconsistent with the last issued certificate of completion for such building or open lot or which would bring it under some special provision of this code or other applicable laws or rules, unless and until the commissioner has issued a new or amended certificate of occupancy.