N.Y. Veh. & Traf. Law § 1643
The legislative body of any city or village with respect to highways (which term for the purposes of this section shall include private roads open to public motor vehicle traffic) in such city or village, other than state highways maintained by the state on which the department of transportation shall have established higher or lower speed limits than the statutory fifty-five miles per hour speed limit as provided in section sixteen hundred twenty of this title, or on which the department of transportation shall have designated that such city or village shall not establish any maximum speed limit as provided in section sixteen hundred twenty-four of this title, subject to the limitations imposed by section sixteen hundred eighty-four of this title may by local law, ordinance, order, rule or regulation establish maximum speed limits at which vehicles may proceed within such city or village, within designated areas of such city or village or on or along designated highways within such city or village higher or lower than the fifty-five miles per hour maximum statutory limit. No such speed limit applicable throughout such city or village or within designated areas of such city or village shall be established at less than twenty-five miles per hour; except that in the city of Long Beach, in the county of Nassau, speed limits may be established at not less than fifteen miles per hour on any portion of the following highways in such city: Cleveland avenue, Harding avenue, Mitchell avenue, Belmont avenue, Atlantic avenue, Coolidge avenue, Wilson avenue and Taft avenue. No such speed limit applicable on or along designated highways within such city or village shall be established at less than twenty-five miles per hour, except that school speed limits may be established at not less than fifteen miles per hour, for a distance not to exceed one thousand three hundred twenty feet, on a highway passing a school building, entrance or exit of a school abutting on the highway and except that within the cities of Buffalo and Rochester speed limits may be established at not less than fifteen miles per hour for any portion of a highway within a city park. No speed limits shall be established pursuant to the provisions of this section except in accordance with the engineering considerations and factors for speed limits set forth in the manual and specifications for a uniform system of traffic control devices maintained by the commissioner of transportation pursuant to section sixteen hundred eighty of this title, as such manual and specifications may be amended from time to time, certified by a licensed professional engineer who specializes in traffic operations.
N.Y. Veh. and Traf. Law § 1643