Whenever an ordinance is enacted annexing property to the city pursuant to a petition for annexation which did not request the determination of a zone prior to the enactment of the ordinance annexing the property to the city and the council chooses not to request a prior determination of zone classification any such property so annexed shall be deemed to be included in the zoning map as being in the R-1 residential district. Within 60 days following annexation, the planning commission shall hold a public hearing to determine the best application of this title to the annexed territory. Following the hearing, the commission shall make its recommendation to the city council for the zoning of the area. (Ord. 192 § 6, 1974; Ord. 109A § 24, 1968).