If the proposed amendment 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 City Clerk by first-class mail at least 20 days before the day of the public hearing to all owners of property within, contiguous to, and directly across the street from such area proposed to be rezoned or redistricted 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 lists or lists that may be specified by the City Council. The failure to deliver the notification as provided in this section shall not invalidate any such amendment. The notice shall contain the same information as required of notices published in newspapers as specified in § 155.2709.