N.Y.C. Admin. Code § 28-118.3.4: § 28-118.3.4 Changes to exits.

No building hereafter altered so as to cause a major alteration to existing exits 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.