In addition to all requirements of the state law, any hearing on a proposed vacation, in whole or in part, or any street or alley shall be preceded by two weeks mailed notice to all property owners within 300 feet of said street or alley. In case of partial vacations, the entire block length shall be the boundary for determining the 300 foot requirement. Notice shall be complete upon mailing, but failure to give mailed notice or any defects in the notice shall not invalidate the proceedings.
(`89 Code, § 150.070)