In order to classify, regulate and segregate uses of lands and buildings; to regulate the height and size of buildings; to regulate the area of yards and other open spaces around buildings; and to regulate the density of population, the following classes of use zones and their subzones are established:

Lot Size Subzones. The size of lots created in each of the O-S subzones may be determined by a suffix number attached to the zone designation on the zoning maps. The application of such suffixes shall be consistent with the general plan and Chapter 17.24. All other requirements of the zone contained in this title shall apply to the respective subzones. The suffix numbers shall only be assigned in 1,000 square foot increments for lots of less than one acre and increments of one acre for lots of one acre or more. Unless designated as acres, suffix numbers from 1 through 43 are assumed to be in thousands of square feet. The application of suffix numbers shall not create lot sizes less than the minimum size specified for the O-S zones. Where no suffix number appears, it is understood that the minimum lot size specified for the O-S zone shall apply.

Where uncertainty exists as to the boundaries of any zone as shown on any zoning map or part thereof, the following rules of construction shall apply:

The establishment and changes of the zone classification on land in the city shall be effected by ordinance adopting zoning maps in the manner set forth in Chapter 17.44.