30 ILCS 310/5

A public corporation may do or cause to be done all acts, or enter into all contracts, indentures and agreements, including, without limitation, trust or escrow agreements, agency agreements and registrar agreements and may expend such sums to effectuate same which are deemed necessary, appropriate, useful or advantageous to the issuance of bonds or other evidences of indebtedness in registered form by the governing body or by the executive officers authorized to issue bonds or other evidences of indebtedness of the public corporation.