Nothing in this Building Code shall require the removal, alteration or abandonment of, nor prevent the continuance of the use and occupancy of a lawfully existing building, except as may be necessary for the safety of life or property.  Upon written request from the owner, the Building Official shall issue a certificate of occupancy for an existing building, certifying by inspection, the occupancy or use of such building; provided, that at the time of issuing such certificate, there are no obligations of law or orders of the Building Official pending.