70 ILCS 1515/2
The commissioners of the Chicago Park District are authorized to issue negotiable coupon bonds of the Chicago Park District to be denominated refunding bonds to refund any of said bonds prior to their maturity; to refund any of said bonds that have matured; to refund any matured coupons evidencing interest on any of said bonds; to refund any of said bonds which by their terms are subject to redemption before maturity; to refund any of said bonds and interest coupons that were paid at maturity from bond and/or corporate funds to avoid default thereof where such bonds and interest coupons shall not have been cancelled and such funds shall not have been reimbursed; and to refund interest at the coupon rate upon any of said matured bonds that has accrued since the maturity date thereof.
The refunding of bonds, of interest coupons and/or of interest not represented by coupons may be authorized by one ordinance or by several ordinances.
Such refunding bonds may be exchanged on the basis of par for par for the bonds, interest not represented by coupons and/or interest coupons refunded, or such refunding bonds may be sold at not less than their par value and the proceeds received shall be used to pay the bonds, interest not represented by coupons and/or interest coupons refunded; such payment may be made without any prior appropriation thereof under any budget law.
Bonds and interest coupons refunded shall be cancelled and interest not represented by coupons shall be cancelled and payment thereof evidenced by written acknowledgment.
70 ILCS 1515/2