Ala. Code § 41-10-471

For the purpose of providing funds for the payment of the principal of and interest on the bonds issued by the authority under the provisions of this article, there is hereby created and irrevocably pledged to the payment of such obligations a special and continuing trust fund which shall consist of all receipts and income from rents contracted for and received by the authority under leases of the building or buildings constructed or renovated with the proceeds from sale of the bonds and any other income of the authority.