60 ILCS 1/35-50.4
To secure payment of any or all of the bonds, any additional ordinance supplementing or amending the election ordinance shall set forth the covenants and undertakings of the township in connection with (i) the issuance of the bonds and the issuance of additional bonds payable from the net revenue or income to be derived from the operation of the senior citizens' housing and (ii) the use and operation of the senior citizens' housing. The additional ordinance may also provide that the bonds, or those that are specified, shall, to the extent and in the manner prescribed, be subordinate and junior with respect to the payment of principal and interest to other bonds designated in the ordinance. The additional ordinance may in the discretion of the township board provide that the bonds be secured by a trust agreement or depositary agreement by and between the township board and a corporate trustee, which may be a trust company or a bank having powers of a trust company within this State. The agreement may contain provisions for directing and enforcing the rights and remedies of the bondholders deemed reasonable and proper, including the terms upon which the trustee and the bondholders, or either of them, may enforce their rights, but no trust agreement, depositary agreement, or other instrument securing the bonds shall convey, mortgage, or otherwise create any lien on the properties constituting the senior citizens' housing, other than the net revenues with respect thereto as described in Sections 35-50.1 through 35-50.6.
60 ILCS 1/35-50.4