Change in zone classification or zone boundary lines established by this title may be initiated by a written request from the council, a motion by the planning commission, or a proper petition presented to the planning commission by property owners within the city and accompanied by the fee for processing such an application as may be established and amended by council resolution. Upon receiving a request for such change, the planning commission will investigate the request and hold a public hearing on the matter. Notice of the date, time, place and purpose of such hearing shall be published in a newspaper of general circulation in the city, posted on the site, posted at the City Hall and other public locations, and mailed to interested agencies and property owners prior to the date set for the hearing in accordance with this chapter and DPMC Title 19. In the case of a change of zone initiated by property owners, the planning commission will prepare findings of fact and issue a notice of decision after the hearing, the decision of the planning commission may be appealed to the council, and in any event, the city council shall have final adoption authority and shall adopt, modify, or deny the change of zone by ordinance at a public meeting if the planning commission's decision is not appealed, or shall take action on the matter after a closed record appeal proceeding if the planning commission's decision is appealed to the council. If, after consideration of the planning commission's notice of decision, the council finds such amendment, or modification thereof, is of public necessity, benefits the general welfare of the city or constitutes good zoning practice, it shall then adopt an ordinance amending the official zoning map which is a part of this title.