In short, because different rules apply to land located outside the City
and its area of impact (although there has been an effort to provide
uniformity in zoning designations) and because the zoning may be
different on pieces of land that otherwide, appear to be similar.
Zoning determines the type (nature, location, quantity) of allowable
development.
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Greg Brown (gregb@siu.edu)
Asst. Professor, Dept. of Forestry
Southern Illinois University, Carbondale, IL 62901
(618) 453-7465