(a) The lawful use of any structure or premises existing and lawful at the time of enactment of or an amendment to this code, may be continued, even though such use does not conform with the provisions of this code. However, nothing in this code shall be interpreted as authorization for continued use of a structure or land established in violation of the zoning regulations in effect prior to the enactment of this code and in continued violation of this code.
(b) Regardless of any other provision of this code, a nonconforming use shall be treated as a conforming use for as long as the use is in existence. Accordingly, the following rights shall be :
(1) If a nonconforming use is damaged by fire, explosion, act of God, or by a public enemy, it may be restored.
(2) If a structure or structures for a nonconforming use is destroyed or damaged by fire, explosion, act of God, or by a public enemy, they may be reconstructed.
(3) A nonconforming use shall be permitted to have the same amount and type of signage as would be allowed for such use in the most restrictive district in which such nonconforming use is .
(4) A nonconforming use may be converted to another nonconforming use first permitted in the same or more restrictive district as the existing use, provided it is not converted to a use permitted in a more restrictive district than the district in which the nonconforming use is located.