(A)   Zoning districts. The City of Urbandale shall be divided into zoning districts that are hereby established and designated as follows:
      (1)   “A-1” Agricultural Reserve District;
      (2)   “A-2” Estate Residential District;
      (3)   “R-1L” Low Density Single-Family District;
      (4)   “R-1I” Intermediate Density Single-Family District;
      (5)   “R-1S” Suburban Density Single-Family District;
      (6)   “R-2” Townhouse Residential District;
      (7)   “R-3” Low Density Multi-Family District;
      (8)   “R-4” Medium Density Multi-Family District;
      (9)   “O-R” Transitional Office/Residential District;
      (10)   “C-O”    Office/Service District;
      (11)   “C-N” Neighborhood Convenience District;
      (12)   “C-G” General Commercial District;
      (13)   “C-H” Highway Commercial District;
      (14)   “C-P” Planned Commerce Park District;
      (15)   “M-1” Planned Industrial District;
      (16)   “M-2” Medium Industrial District;
      (17)   “F-M” Floodplain Management District; and
      (18)   “P.U.D.” Planned Unit Development District.
   (B)   Official zoning map. The zoning districts shall have the boundaries that are shown on a map entitled “Official Zoning Map, City of Urbandale, Iowa,” whether adopted with the text of this Code or adopted by separate action of the City Council, said Official Zoning Map being by reference incorporated in and made a part hereof. The Official Zoning Map shall be so labeled and shall be certified by the Mayor and attested by the City Clerk, and shall be available to the public in the office of the Department of Community Development. Copies of the Official Zoning Map may be produced and used by the city and the public, but in the event of discrepancies between the Official Zoning Map and any copy, the Official Zoning Map as certified and attested, together with amendments thereto, shall govern.
   (C)   Interpretation of zoning district boundaries. The boundaries of districts as shown on the Official Zoning Map shall be administered as follows:
      (1)   Boundaries that approximately follow the centerline of a street or alley shall be construed to follow such centerline;
      (2)   Boundaries that approximately follow a platted lot line shall be construed to follow such lot lines;
      (3)   Boundaries that approximately follow city corporate limits shall be construed to follow the corporate limits;
      (4)   Boundaries that approximately follow a railroad line shall be construed to follow the centerline of the main tracks;
      (5)   Boundaries that approximately follow the centerline of a stream or river channel shall be construed to follow such centerline;
      (6)   Boundaries that are indicated to be parallel to or extensions of features indicated in divisions (C)(1) through (C)(5) above shall be so construed;
      (7)   Distances not specifically indicated on the Official Zoning Map shall be determined by the scale of the map;
      (8)   Where physical or cultural features existing on the ground are at variance with those shown on the Official Zoning Map, or in other circumstances not covered by divisions (C)(1) through (C)(6) above, the Zoning Administrator shall interpret the district boundaries; and
      (9)   If a public street or alley is vacated, said territory shall continue to be zoned as it was prior to vacation, according to the standards for interpretation as set forth in this section.
   (D)   Bulk requirements.
      (1)   Minimum and maximum dimension and area requirements are hereby established for each zoning district, which shall be as set forth in the code sections for each zoning district.
      (2)   If a subdivision plat has a building setback line that exceeds the minimum setback requirement of this code for the zoning district in which the subdivision is located, the larger setback requirement of the plat shall apply.
   (E)   Annexation. Territory that is annexed to or consolidated with the city shall be placed in the “A-1” Agricultural Reserve District and so regulated, unless the City Council acts to place the territory in another zoning district, whether by petition from the owner thereof by its own initiation and whether at the same time the Council approves such annexation or consolidation or at any time subsequent thereto. Placement in another district shall be subject to the same procedural requirements, including but not limited to public hearings before the Planning and Zoning Commission and City Council, as any other change in zoning classification.