Ohio Rev. Code Ann. § 713.12

Before any ordinance, measure, regulation, or amendments thereto, authorized by sections 713.07 to 713.11, inclusive, of the Revised Code, may be passed the legislative authority of the municipal corporation shall hold a public hearing thereon, and shall give at least thirty days' notice of the time and place thereof in a newspaper of general circulation in the municipal corporation. If the ordinance, measure, or regulation intends to re-zone or re-district ten or less parcels of land, as listed on the tax duplicate, written notice of the hearing shall be mailed by the clerk of the legislative authority, by first class mail, at least twenty days before the date of the public hearing to the owners of property within and contiguous to and directly across the street from such parcel or parcels, to the addresses of such owners appearing on the county auditor's current tax list or the treasurer's mailing list and to such other list or lists that may be specified by the legislative authority. The failure of delivery of such notice shall not invalidate any such ordinance, measure, or regulation. During such thirty days the text or copy of the text of such ordinance, measure, or regulation, together with the maps or plans, or copies thereof, forming part of or referred to in such ordinance, measure, or regulation and the maps, plans, and reports submitted by the planning commission, board, or officer shall be on file, for public examination, in the office of the clerk of the legislative authority or in such other office as is designated by the legislative authority. No such ordinance, measure, or regulation which violates, differs from, or departs from the plan or report submitted by the commission, board, or officer shall take effect unless passed or approved by not less than three fourths of the membership of the legislative authority. No ordinance, measure, or regulation which is in accordance with the recommendations, plan, or report submitted by the commission, board, or officer shall be deemed to pass or take effect without the concurrence of at least a majority of the members elected to the legislative authority.