The Common Council may from time to time, on its own motion, amend, supplement, repeal or change the regulations and district boundaries established by this chapter.

Whenever the owners of 50% 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 or change of the regulations prescribed for such district or part thereof, it shall be the duty of the Common Council to vote upon said petition within 30 days from the time such resolution is filed with the City Clerk.

The Planning Board may, by resolution, propose an amendment, supplement or change of the regulations to the Common Council. Within 60 days from the time such resolution is filed with the City Clerk, it shall be the duty of the Common Council to vote on such proposed amendment.

Referral to Planning Board. All proposed amendments, supplements or changes originating by petition, or by motion of the Common Council, shall be referred to the Planning Board for a report and recommendations thereon. The Planning Board shall submit its report within 21 days after receiving such referral. Failure of the Planning Board to report within the required time shall be deemed to be approval of the proposed amendment.

Referral to county. Any proposed amendment affecting real property within 500 feet of the boundary of the City; or the boundary of any existing or proposed county or state park or other recreational area; or the right-of-way of any existing or proposed county or state roadway; or the boundary of any existing or proposed right-of-way for a stream or drainage channel owned by the county for which the county has established channel lines; or the boundary of any existing or proposed county or state-owned land on which a public building or institution is situated; or the boundary of a farm operation located in an agricultural district as defined by article twenty-five AA of the agriculture and markets law shall be referred to the Fulton County Planning Department before final action is taken pursuant to § 239-m of the General Municipal Law.

No action shall be taken on proposals referred to the County Planning Department until its recommendation has been received, or 30 days have elapsed after its receipt of the full statement of the proposed amendment, unless the County Department and the City Council agree to an extension beyond the thirty-day requirement for the County Department's review.

Before any amendment, supplement or change in the regulations or district boundaries, there shall be a public notice and hearing thereon upon public notice of at least five days. Such hearing may be held by the Common Council, by a committee of the Council or by the Planning Board on request of the Common Council. In addition to the public notice of a hearing, notice shall be given in writing, either personally or by mail, to all property owners of the land included in such proposed change, and the land immediately adjacent extending 100 feet therefrom, and the land directly opposite thereto extending 100 feet from the street frontage of such opposite land, as said property owners and addresses appear on the latest completed assessment roll of the City.

Where more than 12 properties are included in such change and the Common Council, by resolution, determines that notice, in writing, to each property owner is not feasible, the notice of hearing shall be posted prominently in public places in the City, including such places in the area affected.