Legislative zone changes or plan amendments (“zone or plan changes”) may be proposed by the Planning Commission or City Council. Such proposed changes shall be broad in scope and considered legislative actions. The City Council shall obtain a recommendation on the proposed changes from the Planning Commission. The recommendation of the Planning Commission shall be forwarded to the City Council within sixty (60) days after it is requested from the Planning Commission. The Planning Commission shall conduct at least one (1) public hearing to assist in formulating its recommendation. The City Council shall conduct its own public hearing. Public notice of the legislative zone or plan change hearing before the City Council shall be published in a newspaper of general circulation within the city at least twenty (20) days prior to the date of the hearing.