N.Y. Suffolk County Tax Act § 45-b
The sale of real estate for unpaid taxes in the county of Suffolk held by the county treasurer in November, nineteen hundred thirty-three, and certificates of sale issued thereon to purchasers, including such county, are hereby validated and confirmed in so far as their validity might otherwise have been affected or may be questioned by reason of lack of statutory authority with respect to the form and substance of the notice of sale, the conditions and manner in which the several parcels were offered for sale, the basis on which bids were permitted, made and accepted, the rates of interest, from a maximum of twelve per centum down to one per centum, bid by the purchaser. With respect to any of the foregoing matters or any acts done or committed, before, during or after the sale, relating to or connected with such matters, failure to comply with any provisions of law, including other provisions of this chapter or section one hundred fifty-two of the tax law or amendments thereof, shall not affect or impair such sale and certificates. In conformity with the terms on which the several pieces or parcels were offered and accepted, and the provisions of this act, the amount of interest payable on redemption hereafter of any such piece or parcel shall be computed and determined at rates as follows: The rate thus established by the bid shall be the rate of interest for the first year, if the redemption be made within the first year; and at double that rate of interest per annum from the date of sale if the redemption be made within the second year; and at treble that rate of interest per annum from the date of sale, if the redemption be made in the third year
N.Y. Suffolk County Tax Act § 45-b