No license shall be issued for any premises in any neighborhood which is predominantly residential or within 300 feet of any public school, church, or any other place of worship, measured in a straight line to the nearest entrance to the licensed premises, except with the approval of the governing body of the municipality; provided, that this limitation shall not apply to any duly licensed premises that at the time of licensing did not come within the restricted area but subsequent to licensing same [came] therein.
Idaho Code § 23-913