Where the violation does not involve a structure, action to rectify such shall be made within 30 days. Where the violation involves a structure, action to rectify shall be made within 60 days. Notwithstanding the foregoing, in the event that, in the course of an investigation of a violation, the city manager deems that a situation is imminently dangerous to the health and/or welfare of a person or persons, or which may represent a fire or safety hazard to persons or property which could cause imminent danger to such person or property, the city manager may, at his or her discretion, reduce the time allowed for rectifying the violation to such time as the city manager deems reasonable under the circumstances.