If a proposed amendment intends to rezone or redistrict an area of ten (10) or less parcels of land as listed on the tax duplicate in addition to the notice required by Section 1139.09 of this Zoning Code, a written notice shall be sent by the Clerk of City Council at least twenty (20) days prior to the hearing by first class mail to property owners appearing on the County Auditor's current tax list of the County Treasurer's mailing list within two hundred fifty (250) feet of the subject property. The failure of delivery of such notice shall not invalidate any subsequent proceedings or legislation. Such notice shall state the date, time and place of the hearing as well as a brief description of the proposed amendment and the property affected by such amendment.