The Municipal Council may, from time to time, on its own motion or on petition or other application, after public notice and hearing, amend, supplement or change the regulations and districts herein established and adopt rules and regulations for the purpose of interpreting and carrying the chapter into effect. When owners of more than fifty (50%) percent of the frontage within a district or part of a district comprising not less than one (1) block, shall present to the Municipal Council a petition or other application, duly signed, requesting the change, relocation or revision of the district or a part thereof, the Municipal Council shall act upon this request within sixty (60) days after the filing of the petition or other application with the Municipal Clerk. The petition shall be accompanied by a map showing the area for which the change of district is asked and immediately abutting property and uses thereof, and further shall be accompanied by a statement setting forth the grounds or reasons for the proposed change. All proposed changes of ordinance or relocation of districts or parts of districts shall be referred by the Municipal Council to the Municipal Planning Board for approval, disapproval or suggestions.

Failure of the Planning Board to approve or disapprove any proposed change within thirty (30) days from the date of its reference to the Board shall have the same effect as approval. In the event of an unfavorable report from the Planning Board, or in case of a protest against a proposed change signed by the owners of twenty (20%) percent or more either of the area of the lots or land included in a proposed change, or of the lots or land in the rear extending two hundred (200) feet therefrom, or of the lots or land on either side or directly opposite extending one hundred (100) feet therefrom (exclusive of street space), that change shall not become effective except by the favorable vote of two-thirds (2/3) of all members of the Municipal Council.