70 ILCS 1515/5
Prior to the maturity of the refunding and/or funding bonds, after setting aside a sum of money equal to the amount of interest that will accrue thereon within the next six months' period from the time it is proposed to purchase and/or redeem any such refunding and/or funding bonds, or the commissioners may require that said sum of money be equal to the amount of interest that will so accrue within the next twelve months' period, the treasurer of the Chicago Park District shall use the money available from the proceeds of taxes levied for the payment of the refunding and/or funding bonds, first, in the purchase of such refunding and/or funding bonds at the lowest price obtainable, but not to exceed their par value and accrued interest, after sealed tenders for such purchase shall have been advertised for as may be directed by the commissioners thereof and thereafter such money shall be used by said official in calling said bonds for payment if, by their terms, they are subject to redemption.
Refunding and funding bonds called for payment and paid or purchased shall be marked paid and cancelled.
Whenever refunding or funding bonds are purchased and/or redeemed and cancelled, the taxes thereafter to be extended for payment of interest shall be reduced in an amount equal to the interest that thereafter would have accrued upon such refunding and funding bonds so cancelled and a resolution shall be adopted by the commissioners finding such facts and a certified copy thereof shall be filed in the office of the county clerk of Cook County whereupon it shall be the duty of such official to reduce and extend such tax levies in accordance therewith.
After bonds are refunded proper reduction of taxes theretofore levied for the payment of the bonds refunded and next to be extended for collection shall be made by the County Clerk upon receipt of a certificate signed by the secretary of the Chicago Park District describing the bonds refunded and amount thereof and the tax to be abated.
Money available from uncollected taxes levied for prior years for payment of bonds and/or interest coupons that have been paid or refunded, after payment of all warrants that may have been issued in anticipation of such taxes shall be placed in the Sinking Fund Account hereinafter designated and used to purchase, call for payment or to pay at maturity such refunding bonds and interest thereon as herein provided.
70 ILCS 1515/5