For the purpose of this Appendix, the City of Rock Island is hereby divided into seventeen (17) classes of districts as follows:

R-1      One Unit Residential

R-2      Two Unit Residential

R-3      One to Six Unit Residential

R-4      Multi-Unit Residential

R-5      Mobile Home

B-1      Neighborhood Business

B-2      Downtown Business

B-3      Community Business

B-4      Highway Business

O-1      Small Office

O-2      Large Office

I-1      Light Industrial

I-2      Heavy Industrial

C-1      Park Conservation

C-2      Nature Conservation

U-1      University

PUD      Planned Unit Development

The boundaries of these districts are hereby established as shown on a map entitled "Zoning Map," City of Rock Island, Illinois, hereinafter referred to as the "Zoning Map," which accompanies and is hereby made a part of this Appendix. The district boundary lines on said map are intended to follow lot lines, the center lines of streets or alleys, the center line of streets or alleys projected, railroad right-of-way lines, or the corporate limit lines, all as they existed at the time of enactment of this Appendix; but when a district boundary line does not clearly coincide with lot lines, it shall be determined by scaling.

Where a district boundary lines divides a lot, which was in single ownership and of record at the time of enactment of this Appendix, the use authorized on and the other district requirements applying to the less restricted portion of such lot is more than fifty (50) feet beyond said dividing district boundary line, such less restricted use shall be limited to the portion of the lot lying within fifty (50) feet of said boundary line.

Questions concerning the exact location of district boundary lines shall be determined by the Appropriate Authority according to the rules and regulations which it may adopt.

All territory which may hereinafter be annexed to the City of Rock Island shall be classed automatically to the R-1 One Unit Residential District within the general land use classification shall have been changed by amendment of this Appendix as provided hereunder.