Section 508. Notice of public hearing

The hearing shall be held at a time
  and place appointed by the commissioner who shall give  notice  of  such
  hearing  by  publication in a newspaper, designated by him, published or
  circulated in  the  municipality  or  county  wherein  the  property  is
  located,  at  least ten days prior to such hearing. Where a municipality
  publishes an official daily publication,  notice  of  hearing  shall  be
  published  only  in  such official publication. A duly certified copy of
  such certificate shall be conclusive evidence as to the matters lawfully
  certified therein in any proceeding to acquire  property,  or  any  part
  thereof, set forth in such certificate.