This chapter or the Official Zoning Map may be amended or repealed
as provided in this chapter either on the initiative of the Zoning
Commission or by petition. The Commission is not required to hear
any petition or petitions relating to the same changes, or substantially
the same changes, more than once in a period of 12 months. The Zoning
Commission may grant a rehearing if it finds, or facts are presented
in writing, that a material change in the situation justifies this
action in the interest of the public as well as the petitioner.