For housing accommodations first rented after April 15, 1962, unless a registration statement was filed with the State Rent Commission on or before April 30, 1962, a registration statement, upon forms prescribed by the administrator, shall be filed by May 15, 1962, or within 15 days after first renting, whichever is later.
N.Y. Comp. Codes R. & Regs. Tit. 9 § 2203.3