60 ILCS 1/15-70

The city council of any coterminous city located in a county with a population of less than 1,000,000 may, by the affirmative vote of three-fourths of its members, authorize the township supervisor to preside over portions of city council meetings when the city council is exercising powers that would ordinarily be exercised by the township board in a township not organized under this Article. While the township supervisor is presiding, the supervisor has one vote and the mayor has no vote.