All ordinances which provide for rezoning to any use other than uses permitted by present zoning, shall be subject to the following special rules:
(a) A public hearing thereon shall be required and at least thirty (30) days' notice shall be given in a newspaper of general circulation in the municipality; in addition, the Clerk-Treasurer shall mail or deliver a copy of said notice to the residence of each elector of the municipality at least fifteen (15) days prior to said public hearing.
(b) Notwithstanding the provisions of Article XI of this Charter or the general laws of the State of ohio, referendum petitions signed by ten (10) percent of the number of electors who voted for governor at the next preceding general election for governor in the municipality shall contain a sufficient number of signatures, if said petitions are otherwise legally sufficient, to permit or cause the approval of such petitions for submission of the subject ordinance to the electors of the municipality pursuant to Article XI of this Charter and the general laws of the State of Ohio.