The purpose of this subsection is to allow for the implementation of the comprehensive plan policies relating to future commercial centers and industrial developments, as appropriate and consistent with the La Center comprehensive plan and La Center capital facilities plan. If, from the facts presented, and the findings, report and recommendations of the planning commission as required by this section thereof, the city council determines that the public health, safety and general welfare will be best served by a proposed change of zone, the city council may indicate its general approval, in principle, of the proposed rezoning by the adoption of a "resolution of intent to rezone" the area involved. This resolution shall include any conditions, stipulations or limitations which the city council may feel necessary to require in the public interest as a prerequisite to final action. The fulfillment of all conditions, stipulations and limitations contained in said resolution, on the part of the applicant, shall make such a resolution a binding commitment on the city council. Such a resolution shall not be used to justify spot zoning, to create unauthorized zoning categories by excluding uses otherwise permitted in the proposed zoning, or by imposing setback, area or lot coverage restrictions not specified in the code for the zoning classification, or as a substitute for a variance. Upon completion of compliance action by the applicant, the city council shall, by ordinance, effect such rezoning. The failure of the applicant to meet any or all conditions, stipulations or limitations contained in the resolution, including the time limit placed in the resolution, shall render the resolution of intent to rezone null and void, unless an extension is granted by the city council upon recommendation of the planning commission. Generally, the time limitation shall be one year. The city council may grant one one-year extension, after which the resolution shall be null and void if all conditions, stipulations and limitations have not been met by the applicant.