17.12.020   Districts established.
   The following zoning districts are established for the zoning jurisdictional area of the city.
   For interpretation of this title the zoning districts have been formulated to realize the general purposes as set forth in Section 17.12.010.
   The districts shall be named and designated as follows:
   A.   Class A residential district;
   B.   Class B residential district;
   C.   Business district.
(Ord. 441 Art.  II Part 1 § 2, 1992) .