Ind. Code § 36-9-11.1-12

Sec. 12. So long as any of the revenue bonds are outstanding, the consolidated city may not mortgage, pledge, or otherwise encumber any part of the property of the parking facility or facilities, or dispose of any part of them. However, equipment that is worn out and replaced or property that is no longer useful or profitable in the operation of the facility or facilities, and the proceeds from any such sale, shall be deposited in the fund or account for the payment of the principal and interest on the revenue bonds. In addition, the city may lease the property or any part of it to others for public, private, or commercial purposes on such terms and conditions and for such time so as not to adversely affect the rights of bondholders.