The city council may, from time to time, amend, supplement, or change by ordinance the boundaries of the districts, establish new districts, or revise the regulations herein established. Before taking any action on a proposed amendment, the city council shall hold a public hearing thereon. Written notice of the public hearing shall be sent to owners of real property lying within two hundred feet (200') of the property on which a change in classification is proposed. Such written notice shall be given not less than ten (10) days before the date set for hearing, to all such owners who have rendered their said property for taxes as the ownership appears on the last approved appraisal district tax roll. Such notice may be served by depositing the same, properly addressed and postage paid, in the U.S. mail. At least fifteen (15) days’ notice of the time and place of the public hearing shall be published in the official newspaper of the city. No change in zoning classification shall be granted until after the 30th day following the notice to property owners required herein. In the event the city council proposes amendment to the zoning ordinance not involving a particular property but involving a change in the zoning regulations generally, notice to individual property owners shall not be required. In such cases, notice of the required public hearing shall be given by publication in the official newspaper of the city, stating the time and place of the public hearing, which time shall not be earlier than fifteen (15) days from the date of such publication.