(70 ILCS 1825/4.10)
(from Ch. 19, par. 254.10)
To restrict the height of any object of natural growth or
structure or structures within the vicinity of any airport or within the
lines of an approach to any airport and, when necessary, for the reduction
in the height of any such existing object or structure, to enter into an
agreement for such reduction or to accomplish same by condemnation.
(Source: Laws 1965, p. 3150.)