N.Y.C. Admin. Code § 28-118.3.5: § 28-118.3.5 Existing buildings or open lots without certificates of occupancy.

A building or open lot in existence prior to January 1, 1938 and heretofore legally used or occupied without a certificate of occupancy or, if applicable, a certificate of completion, and subject to the provisions of section 28-102.4 (continuation of lawful existing use), may continue to be used or occupied without a certificate of occupancy or, if applicable, a certificate of completion, provided such use or occupancy is not inconsistent with the records of the department relating to the lawful use of such building or open lot, and complies with applicable laws and rules, and provided there is no change in the existing use or occupancy classification of the building, open lot or portion thereof.