Whenever the public necessity, convenience, general welfare or good zoning practice require, the President and Town Commissioners of Princess Anne may, by ordinance, after recommendation by the Planning and Zoning Commission and subject to the procedures set forth in this article, amend, supplement or change the regulations, district boundaries or classifications of property now or hereafter established by this chapter or amendments thereof. Such amendment, supplement or change may be initiated by resolution of the President and Commissioners, by motion of the Planning and Zoning Commission or by petition of any property owner addressed to the President and Commissioners.