N.Y.C. Admin. Code § 28-315.8.2.1: § 28-315.8.2.1 Modification to the flood hazard area.

Where the special flood hazard area or shaded X-Zone, as established in appendix G of the New York city building code, is modified on or after the effective date of this section, any building identified in section 28-315.8.2 of this code and newly identified as being within such modified special flood hazard area or shaded X-Zone shall, no later than 20 years following the adoption of such modification, comply with the retroactive requirements of section G312.2 of appendix G of the New York city building code. The owner of such building shall, no later than 20 years following the adoption of such modification, file with the department a report detailing compliance with such requirements in accordance with section G312.2.2 of such appendix.