310 ILCS 10/20
Bonds of an Authority shall be authorized by its resolution and may be issued in one or more series and shall bear such date or dates, mature at such time or times, bear interest at such rate or rates not exceeding the maximum rate permitted in "An Act to authorize public corporations to issue bonds, other evidences of indebtedness and tax anticipation warrants subject to interest rate limitations set forth therein", approved May 26, 1970, as now or hereafter amended, be in such denomination or denominations, be in such form, either coupon or registered, carry such conversion or registration privileges, have such rank or priority, be executed in such manner, be payable in such medium of payment at such place or places, and be subject to such terms of redemption (with or without premium) as such resolution or its trust indenture or the bonds so issued may provide.
The bonds may be sold at not less than par and accrued interest, at public or private sale.
In case any of the commissioners or officers of the Authority whose signatures appear on any bonds or coupons, shall cease to be such commissioners or officers before the delivery of such bonds, such signatures shall, nevertheless, be valid and sufficient for all purposes, the same as if such commissioners or officers had remained in office until such delivery. Any bonds issued pursuant to this Act shall be fully negotiable.
In any suit, action or proceedings involving the validity or enforceability of any bond of an Authority or the security therefor, any such bond reciting in substance that it has been issued by the Authority to aid in financing a housing project to provide dwelling accommodations for persons of low income or to aid in slum clearance or land assembly for redevelopment purposes or for any other purposes authorized by this Act shall be conclusively deemed to have been issued for a project of such character and said project shall be conclusively deemed to have been planned, located and constructed in accordance with the purposes and provisions of this Act.
310 ILCS 10/20