60 ILCS 1/15-25

Parcel annexed less than 1% of total equalized assessed value of adjacent township. Within any 12 month period beginning on the date of a coterminous city's first annexation after August 11, 1986, when any parcel of territory lying in an adjacent township is annexed by the city and the parcel constitutes less than 1% of the total equalized assessed value of the adjacent township, and until all such parcels annexed during each such annual period constitute 1% or more of the total equalized assessed value of the adjacent township, each separate parcel shall become disconnected from that township and included in the coterminous township without having the proposition to disconnect submitted to the voters in the adjacent township.