The Board of Commissioners may, from time to time, after public notice and hearing, amend, supplement or change the regulations and districts herein established. Proceedings for an amendment may be initiated only as follows:

If a protest is filed against any proposed amendment or revision of a zoning ordinance, 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 extending 200 feet in all directions therefrom, exclusive of street space, within or without the municipality, such amendment shall not become effective except by a favorable vote of 2/3 of all the members of the Board of Commissioners.

No amendment, supplement, change, modification or repeal of any regulation, restriction or district boundary shall become effective until after a public hearing in relation thereto, at which the parties in interest and citizens shall have an opportunity to be heard.

At least 10 days' notice of the time and place of such hearing shall be published in an official paper or a paper of general circulation in the town.

The hearing by the Board of Commissioners on a proposed amendment or resolution shall be held on the petition or resolution as filed. Any further proposal in respect to any proposal made in connection therewith or any addition or modification of the content of the proposed amendment shall be made only in the form of an amended petition or resolution. The filing of any such amended petition or resolution shall terminate all proceedings consequent on the original petition or resolution and shall be deemed to be the initiation of new proceedings, which shall be conducted in full conformity with the provisions of this article as if the original petition or resolution had never been filed, except that a protest filed against the amendment as originally proposed shall be deemed to have been filed against the amendment as proposed in the amended petition to the extent that it is pertinent thereto.

Before adopting any amendment, the Board of Commissioners shall adopt a resolution setting forth the findings upon which it determined such amendment to be required by the public interest in furtherance of the purposes of this chapter.

No petition for a change in district boundaries shall be considered by the Board of Commissioners within a period of one year from its last consideration of any proposed change in district boundaries applying to substantially the same land.

With the consent of the Board of Commissioners, any petition for an amendment may be withdrawn at any time by the filing of a verified petition of withdrawal signed by a majority of the persons who signed the original petition. Such withdrawal shall terminate the proceedings initiated by the original petition. Any proceedings for an amendment initiated by a resolution of the Board of Commissioners or the Planning Board may be terminated by the body that initiated the same at any time that such proceedings are before said body. In any event, any hearing of which notice has been given shall be held.

In furtherance of the purposes set forth in Article I, the Planning Board shall, at intervals of not greater than two years, report to the Board of Commissioners as to the necessity for a general revision of this chapter. If the Planning Board recommends such a revision, it shall describe the conditions which it believes indicate the desirability thereof, outlining in general the respects in which it is of the opinion that the chapter could be better adapted to such conditions in furtherance of the purposes set forth in Article I and shall indicate the scope of the revision that it believes to be advisable.