N.Y.C. Admin. Code § 28-213.6: § 28-213.6 Enhanced penalties for other violations.

Where a penalty is imposed pursuant to this article for work that has been performed without a permit on a building (i) the civil penalty for each violation of this code issued for such building within one year after such imposition shall be two times the penalty that would otherwise apply for such violation or (ii) if such work without a permit was performed on only part of such building and the owner of such part is not the owner of such building, the civil penalty for each violation of this code issued for such part within one year after such imposition shall be two times the penalty that would otherwise apply for such violation.

(L.L. 2017/158, 8/30/2017, eff. 8/30/2018)