20 ILCS 3110/9
The Authority shall keep account of the gross total income derived from each separate project or any combination thereof undertaken pursuant to this Act. Disbursements from a given account in The Public Building Fund shall be ordered by the Authority only for the payment of (1) the principal of and interest on the bonds issued for each project, or combination thereof, and (2) any other purposes set forth in the resolution authorizing the issuance of such bonds.
An accurate record shall be kept of the rental payments under each lease entered into by the Authority and any officer, department, board, commission or other agency of the State of Illinois, the Director of the Department of Central Management Services, the Board of Trustees of the University of Illinois, the Board of Trustees of Southern Illinois University, the Board of Trustees of Chicago State University, the Board of Trustees of Eastern Illinois University, the Board of Trustees of Governors State University, the Board of Trustees of Illinois State University, the Board of Trustees of Northeastern Illinois University, the Board of Trustees of Northern Illinois University, the Board of Trustees of Western Illinois University, or any public community college district board, and when the rentals applicable to each project or facility, or any combination thereof, constructed, completed, remodeled, maintained and equipped, have been paid in (1) amounts sufficient to amortize and pay the principal of and interest upon the total principal amount of bonds of the Authority issued to pay the cost of each project or facility, including maintenance and operation expenses and that proportion of the administrative expense of the Authority as provided for by each lease, or (2) amounts which when invested in direct obligations of the United States of America are, together with earnings thereon, sufficient to amortize and pay the principal of and interest upon the total principal amount of bonds of the Authority issued to pay the cost of each project or facility, including maintenance and operation expenses and that proportion of the administrative expense of the Authority as provided for by each lease, the property shall be conveyed without charge to the lessee.
20 ILCS 3110/9