Iowa Code § 263A.5
Upon the determination by the state board of regents to undertake and carry out any project or to refund outstanding bonds or notes, said board shall adopt a resolution describing generally the contemplated project and setting forth the estimated cost thereof, or describing the obligations to be refunded, fixing the amount of bonds or notes to be issued, the maturity or maturities, the interest rate or rates, and all details in respect thereof. Such resolution shall contain such covenants as may be determined by the board as to the issuance of additional bonds or notes that may thereafter be issued payable from the hospital income received by the institution, the amendment or modification of the resolution authorizing the issuance of any bonds or notes, the manner, terms, and conditions and the amount or percentage of assenting bonds or notes necessary to effectuate such amendment or modification, and such other covenants as may be deemed necessary or desirable. In the discretion of the board, any bonds or notes issued under the terms of this chapter may be secured by a trust indenture by and between the board and a corporate trustee, which may be any trust company or bank having the powers of a trust company within or without the boundaries of the state of Iowa, but no such trust indenture shall convey or mortgage the buildings and facilities or any part thereof. The provisions of this chapter and of any resolution or other proceedings authorizing the issuance of bonds or notes and providing for the establishment and maintenance of adequate rates, fees, and charges for services rendered by the hospitals, medical clinics, and medical laboratories of the institution and the application of the proceeds thereof, together with other hospital income, shall constitute a contract with the holders of such bonds or notes.
Iowa Code § 263A.5