1. New Buildings: No building hereafter erected shall be used or occupied in whole or in part until the certificate of use and occupancy shall have been issued by the Code Enforcement Officer.

2. Building hereafter altered: No building hereafter enlarged, extended or altered to change from one use group to another, in whole or in part, and no building hereafter altered for which a certificate of use and occupancy has not been heretofore issued, shall be occupied or used until the certificate shall have been issued by the building inspector, certifying that the work has been completed in accordance with the provisions of the approved permit; except that any use or occupancy, which was not discontinued during the work of alteration, shall be discontinued within thirty (30) days after the completion of the alteration unless the required certificate is secured from the Code Enforcement Officer.

3. Existing Buildings: Upon written request from the owner of an existing building, the Code Enforcement Officer shall issue a certificate of use and occupancy provided there are no violations of law or orders of the building officials pending, and it is established after inspection and investigation that the alleged use of the building has heretofore existed. Nothing in the Zoning Ordinance shall require the removal, alteration or abandonment of, or prevent the continuance of the use and occupancy of a lawfully existing building, unless such use is deemed to endanger public safety and welfare.

4. Changes in Use and Occupancy: After a change of use has been made in a building, the reestablishment of a prior use that would not have been legal in a new building of the same type of construction is prohibited unless all the applicable provisions of the Basic Code are complied with. A change from one prohibited use, for which a permit has been granted, to another prohibited use shall be deemed a violation of the Zoning Ordinance.