70 ILCS 2805/32g
Bonds provided for in this article shall be issued in such amounts as may be necessary to provide sufficient funds to pay all costs of acquisition, including engineering, legal, and other expenses, together with interest to a date six months subsequent to the estimated date of completion. Bonds issued under this article are negotiable instruments. They shall be executed by the president and by the district clerk and shall be sealed with the corporate seal of the district. In case any of the officers whose signatures appear on the bonds, or coupons attached thereto, ceases to hold his office before delivery of the bonds, his signature nevertheless shall be valid and sufficient for all purposes the same as if he had remained in office until the delivery of the bonds. The bonds shall be sold in such manner as the trustee shall determine except that, if issued to bear interest at the rate of six per cent annually, the bonds shall be sold for not less than par and accrued interest, and except that the selling price of bonds bearing less than six per cent interest shall be such that the interest cost to the district of the money received from the bond sale shall not exceed six per cent annually computed to maturity according to standard tables of bond values.
70 ILCS 2805/32g