For the purpose of promoting the public health, safety, morals and general welfare of the city, the municipality is divided into the following designated zoning districts:

The districts are bounded and defined as shown on the map entitled zoning map of the City of Byron, Illinois, which, with all explanatory matter thereon, is made a part of this title.

Where uncertainty exists with respect to the boundaries of any of the aforesaid districts as shown on the zoning map, the following rules shall apply:

1. Where district boundaries are indicated as approximately following the centerline of streets or street lines, such centerline or street lines shall be construed to be such boundaries.
2. Where district boundaries are indicated as approximately following the lot lines, such lot lines shall be construed to be such boundaries.
3. Where district boundaries are so indicated that they are approximately parallel to the centerline or street lines of streets, such district boundaries shall be construed as being parallel thereto and at such distance therefrom as indicated on the zoning map. If no distance is given, such dimension shall be determined by the use of the scale shown on the zoning map.

Except as hereinafter provided:

1. No building or land shall hereafter be used or occupied and no part thereof shall be erected, moved, or altered unless in conformity with the regulations specified in this title for the district in which it is located.
2. No building shall hereafter be erected or altered to:
   1. Exceed the height;
   2. Accommodate or house a greater number of families;
   3. Occupy a greater percentage of lot area; or
   4. Have narrower or smaller rear yards, front yards, side yards, inner or outer court; than is specified in this title for the district in which such building is located.
3. No part of a yard or other open space required about any building for the purpose of complying with the provisions of this title shall be included as part of a yard or other open space similarly required for another building.

The zoning board of appeals where appropriate, in its discretion, may require a buffer area between zoning districts.