After receiving the Planning Commission's report or petition for a proposed zoning amendment, Council shall hold a public hearing on the proposal and shall give at least thirty days notice of the time and place thereof in a newspaper of general circulation in the City. If the ordinance, measure or regulation intends to rezone or redistrict ten or less parcels of land as listed on the tax duplicate, written notice of the hearing shall be mailed by the Clerk of Council of the legislative authority by first class mail, at least twenty days before the date of the public bearing to the owners of property within, 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 Council or in such other office as is designated by Council.