The county board of a county referenced in subsection (c) of Section 11-15.1-2.1 of the Illinois Municipal Code may, in accordance with subsection (c) of Section 11-15.1-2.1 of the Illinois Municipal Code, retain jurisdiction over land that is the subject of an annexation agreement and is located more than 1.5 miles from the corporate boundaries of the municipality.
55 ILCS 5/5-1129