(a) As additional security for the payment of an obligation issued under this chapter, the board may have executed in favor of the holder of the obligation an indenture mortgaging and encumbering:(1) the improvements, facilities, and other property acquired with the proceeds of the sale of the obligation; or(2) all the authority's improvements, facilities, and other property.(b) The indenture may also mortgage and encumber the revenue to be derived from the operation of the improvements, facilities, and other property.(c) In the encumbrance, the board may provide for granting to any purchaser at a foreclosure sale under the encumbrance a franchise to operate the improvements, facilities, and other property for a term not to exceed 50 years after the date of the purchase, subject to the laws regulating the matter.(d) The indenture:(1) may contain the provisions the board considers proper; and(2) is enforceable in the manner provided by the laws of this state for the enforcement of other mortgages and encumbrances. Added by Acts 2013, 83rd Leg., R.S., Ch. 112 (S.B. 1026), Sec. 1.04, eff. April 1, 2015.