N.Y. County Law § 828
The governing body of any county containing a population of less than two hundred thousand and adjoining a city of the first class may authorize the establishment of a plan for the grades of streets, avenues and boulevards; the alteration of such plan of grades, or any plan thereof, which shall have been established by law; the laying out, opening, grading, construction, closing and change of line, or of the width of any one or more of such streets, avenues and boulevards or any other streets, avenues and boulevards, within said county, or any part or parts thereof, and of the courtyards, sidewalks and roadways; to provide for the estimation and award of the damages to be sustained, and for the assessment on property intended to be benefited thereby, and fixing assessment districts therefor, the levying, collection and payment of such damages, and of all other charges and expenses to be incurred, or which may be necessary in carrying out the provisions of this section; the laying out of new or additional streets, avenues or boulevards according to a general scheme or plan for the improvement of highways in said town, the acceptance by town officers of conveyances of land for public highways, naming and changing of names of streets and avenues within the said county, the opening, laying out, grading, construction, closing and change of line of any street, avenue or boulevard within the county, provided, however, that nothing shall be done hereunder in respect to or concerning any street, avenue or boulevard situated within an incorporated village, without the consent of the board of trustees of such incorporated village. The provisions, however, for the defraying of expenses thereof by assessment as herein provided, shall only be exercised on the petition of the property owners who own more than one-half of the frontage on any such street, avenue or boulevard, or on the certificate of the supervisor, justices of the peace, and town clerk of the town in which said street, avenue or boulevard is located, or two-thirds of such officers, that the same is in their judgment proper and necessary for the public interest; or in case the said street, avenue, or boulevard, in respect to which such action is proposed to be taken, shall lie in two or more towns, on a like certificate of such town officers of each of said towns, or two-thirds of all of them; provided, however, that before proceeding to make any such certificate, the said officers, or such number of them as aforesaid, shall give ten days' notice by publication in one of the weekly papers of said county and by posting in six public places in said town, or in each of said towns, of the time and place at which they will meet for the purpose of considering the same, at which meeting the public and all persons interested may appear and be heard in relation thereto; and provided that no such street or avenue shall be laid out, opened or constructed upon or across any lands heretofore acquired by the right of eminent domain, and be held in fee for depot purposes by any railroad. In the event that the town maintains a website, one of the posting requirements may be fulfilled by posting such information on the website.
Should the governing body of any such county at any time deem it for the public interest to acquire title to lands and premises required for any street, highway or boulevard heretofore or hereafter laid out, widened, altered, extended or otherwise improved, it may acquire the same by dedication, or by condemnation under the eminent domain procedure law, provided, however, that no land shall be acquired for any street, highway or boulevard in a village, without the consent of the board of trustees of such village. Such board may direct, by a two-thirds vote of the total voting power of the board, that the title to any piece or parcel of land lying within the lines of any such street, highway or boulevard shall be vested in the county upon the date of recovery of such dedication or as provided in the eminent domain procedure law. Thereafter, the property so acquired shall upon vesting be held, appropriated, converted and used to and for such purpose accordingly, in like manner as are other public streets in said county. In such cases interest at the rate specified in section three-a of the general municipal law upon the sum or sums to which the owners, lessees, parties or persons are justly entitled as provided in the eminent domain procedure law. Upon the vesting of title, the county or any person or persons acting under its authority, may subject to compliance with the eminent domain procedure law immediately, or at any time thereafter take possession of the same, or any part or parts thereof, without any suit or proceeding at law for that purpose. The title acquired by the county, to lands and premises required for a street, shall be in trust, and such lands and premises appropriated and kept open for, or as part of a public street or highway, forever, in like manner as the other streets in the county.
N.Y. CountyLaw § 828