Notwithstanding the existence of a valid certificate of occupancy, the Building Inspector/Code Enforcement Officer, the Assistant Building Inspector/Code Enforcement Officer, the Fire Marshal, the Fire Safety Inspector, the Fire Chief or any Assistant Fire Chief may cause the subject building to be inspected as often as may be reasonably necessary for the purpose of ascertaining and causing to be corrected any violations of provisions of the laws, ordinances, rules and regulations which they enforce. Whenever any such violations are discovered, the Building Inspector/Code Enforcement Officer shall notify the owners of the property and shall provide 30 days, or a longer period of time if deemed appropriate, to correct the violation. If, after such period of time, the violations are not corrected, any existing certificate of occupancy shall become null and void, and the Building Inspector/Code Enforcement Officer shall notify the owners of the property that continued occupancy or use of the premises is illegal.