Mo. Rev. Stat. § 71.250
If no opposition be made to such petition, the county commission may vacate the same, with such restrictions as they may deem for the public good; but if opposition be made, such application shall continue until the next term of the commission, when, if the objector consent to such vacation, or if two-thirds of all the real estate holders of the town or city petition therefor, the commission may grant the prayer of the petition. The part so vacated, if it be a lot, shall vest in him who may have the title thereof, according to law; and if the same be a street or alley, the same shall be attached to the ground bordering on such street or alley, and all title thereto shall vest in the person owning the property on each side thereof in equal proportions, according to the length or breadth of such ground, as the same may border on such street or alley; and whenever a public square or common shall be vacated, the property thereof shall be disposed of in such manner as the proper authorities of said town or city may direct.
§ 71.250, RSMo