The document defines brownfield sites and provides information on brownfield redevelopment programs in Illinois. It describes brownfield sites as real property complicated by actual or perceived contamination that has potential for redevelopment. It provides examples of common brownfield sites like old factories, mills, and gas stations. The document outlines the brownfield redevelopment process and various funding programs available through the Illinois EPA for assessment, cleanup, and planning grants. It highlights success stories of brownfield redevelopments in Illinois that have been assessed, cleaned up, and redeveloped.