1.   Districts Established. For the purpose of this chapter, the following districts are established.

      R-A      Residential Agricultural District

      FG       Fairgrounds District

      C-1       Conservation District

      A-1       Agricultural District

      A-2       Agricultural District

      R-1       One-Family Residence District

      R-S       Suburban Residence District

      R-2       One- and Two-Family Residence District

      R-3       One- to Six-Family Residence District

      R-4       Multi-Family Residence District

      R-5       Multi-Family Residence District for Elderly Housing

      CCRC    Continuing Care Retirement Community District

      B-1       Central Business District

      B-2       General Business District

      I-1       Light Industrial District

      I-2       General Industrial District

   2.   Boundaries. The boundaries of these districts are hereby established as shown on a map entitled “Zoning Map,” on file in the office of the Clerk and hereby made a part of this chapter by reference. The district boundary lines on said map are intended to follow lot lines, the centerlines of streets or alleys, the centerlines of streets or alleys projected, railroad rights-of-way, or the corporate limit lines, all as they existed at the time of enactment of this chapter; but where a district boundary line does not clearly coincide with lot lines, it shall be determined by scaling. There are two maps entitled “Zoning Map,” one for the area within the corporate City limits, and one for the two-mile extraterritorial area, as referred to in Subsection 6 of this section.

   3.   Use When Line Divides Lot. Where a district boundary line divides a lot which was in single ownership and of record at the time of enactment of this chapter, the use authorized on and the other district requirements applying to the less restricted portion of such lot shall be considered as extending to the entire lot, provided, that where the more restricted portion of such lot is more than 50 feet beyond said dividing district boundary line, such less restricted use shall be limited to the portion of the lot lying within 50 feet of said boundary line.

   4.   Interpretation. Questions concerning the exact location of district boundary lines shall be determined by the Board of Adjustment according to rules and regulations which it may adopt.

   5.   Annexation. All territory which may hereafter be annexed to the community shall be classed automatically as being in an A-1 Agricultural District until such classification shall have been changed by amendment as provided hereinafter.

   6.   Extra-Territorial Authority. The zoning regulations of the City are hereby extended and made applicable to the unincorporated area two miles beyond the limits of the City, pursuant to the provisions of Code of Iowa Section 414.23. A general description of the area to be included is as follows:

      Sections 3, 4, 5, 6, 7, 8, 9 and 10; the W½ of Section 11; the W¾ of Section 14; Sections 15, 16, 19, 20, 21 and 22; the W¾ of Section 23; the W½ of Section 26; Sections 27, 28, 29 and 30; the N½ of Section 31; the N¾ of Section 32; the N½ of Section 33; and the N½ of Section 34; all in Washington Township, T 75 N, R 7 W of the 5 th P.M.; and also

   The S½ of Section 31; the S½ of Section 32; and the S½ of Section 33; all in Jackson Township, T 76 N, R 7 W of the 5 th P.M.; and also

   Section 1; the SE¼; the SE¼ of the NE¼ and the SE¼ of the SW¼ of Section 2; Sections 11, 12, 13 and 14; the E½ of Section 23; Sections 24 and 25; the NE¼ of Section 26; and the NE¼ of Section 36; all in Franklin Township, T 75 N, R 8 W of the 5 th P.M.; all in Washington County, Iowa.