N.Y.C. Admin. Code § 26-607: § 26-607 Effective dates of exemption orders/tax abatement certificates.

The effective date of a rent increase exemption order/tax abatement certificate shall be the date of the first increase in maximum rent becoming effective after the applicant's eligibility date, except that in no event shall a rent increase exemption order/tax abatement certificate become effective prior to January first, nineteen hundred seventy-six.