§ 83. Amendments, alterations and changes in district lines. 1. The
common council may from time to time on its own motion or on petition,
after public notice and hearing, which hearing may be held by the
council or by a committee of the council or by the planning board, amend
the regulations and districts established under any ordinance or local
law adopted pursuant to paragraphs twenty-four and twenty-five of
section twenty of this chapter. Wherever the owners of fifty per centum
or more of the frontage in any district or part thereof shall present a
petition duly signed and acknowledged, to the common council, requesting
an amendment, supplement, change or repeal of the regulations prescribed
for such district or part thereof, it shall be the duty of the council
to vote upon said petition within ninety days after the filing of the
same by the petitioners with the secretary of the council.

2. An amendment shall be effected by a simple majority vote of the
council, except that an amendment shall require the approval of at least
three-fourths of the members of the council in the event such amendment
is the subject of a written protest, presented to the council and signed
by:

(a) the owners of twenty percent or more of the area of land included
in such proposed change; or

(b) the owners of twenty percent or more of the area of land
immediately adjacent to that land included in such proposed change,
extending one hundred feet therefrom; or

(c) the owners of twenty percent or more of the area of land directly
opposite thereto, extending one hundred feet from the street frontage of
such opposite land.