65 ILCS 5/11-100-1
Every city with a population not exceeding 15,000 has the power to acquire by purchase, or otherwise, land in or within 4 miles of the corporate limits of the city for the purpose of providing public parks for the use of the city's inhabitants. It may enclose, improve, and maintain such a public park and regulate its use by ordinance. However, no money shall be expended for the purchase of any land for the designated purpose until the question whether the money shall be so expended has been certified by the clerk and submitted to a vote of the electors of the city at an election in accordance with the general election law, and has received the approval of a majority of the votes cast on the question.
But any city whose electors have approved the question of the expenditure of money for the purchase of land for the designated purpose under "An Act to enable certain cities to provide and maintain public parks for the use of the inhabitants thereof," approved April 24, 1899, as amended, may continue to expend money for the designated purpose without submitting the question to the electors for approval under Sections 11-100-1 and 11-100-2.
65 ILCS 5/11-100-1