The regulations, limitations and restrictions of this article may from time to time be amended, changed, modified or repealed and the boundaries of the districts hereby established changed by ordinance adopted by the Borough Council after public hearing thereon, but no amendment or change shall become effective unless the ordinance proposing such amendment or change shall first have been submitted to the Planning Board for approval, disapproval or recommendations. The Planning Board shall have a period of 35 days for consideration and report. In the case of an unfavorable report by the Planning Board, such amendment shall not become effective except by favorable vote of a majority of the full authorized membership of the Borough Council.