Child care centers in the R-1 district which are nonconforming as to the number of children cared for and/or the type of state license held shall be allowed to continue operation under the provisions of this chapter; provided, that no new child shall be taken under care while the number of children regularly cared for remains above twelve. The operator of a child care center located in the R-1 district shall, within thirty days of the date upon which the number of children regularly cared for drops to or below twelve, make application to the state for a family day care home license or a mini day care program license, subject to the provisions of applicable provisions of the municipal code or state law or administrative code. In the event such license is denied or canceled or otherwise withdrawn or removed, the operation shall be discontinued. In the event such license is granted, the operation will automatically become a permitted or conditionally permitted use under the provisions of this title, and shall not be allowed to revert to a nonconforming status in the future.