The City 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 50% of the frontage within a district or part of district comprising not less than one block shall present to the City Council a petition or other application, duly signed, requesting the change, relocation or revision of said district or a part thereof, the City Council shall act upon said request within 60 days after the filing of said petition or other application with the City Clerk. Said petition shall be accompanied by a map showing the area for which the change of district is asked and all 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 such proposed changes of this chapter or relocation of districts or part of districts shall be referred by the City Council to the City Planning Board for approval, disapproval or suggestions. Failure of the Planning Board to approve or disapprove any proposed change within 45 days from the date of its reference to the Board shall have the same effect as approval thereof.
In the event of unfavorable report from the Planning Board or in case of a protest against such proposed change signed by the owners of 20% or more either of the area of the lots or land included in such proposed change or of the lots or land in the rear thereof extending 100 feet therefrom or of the lots or land on either side thereof or directly opposite thereto extending 100 feet therefrom (exclusive of street space), such change shall not become effective except by the favorable vote of 2/3 of all members of the City Council.