Texas Local Government Code - LOC GOV'T § 281.072. Additional Security

(a) At the board's discretion, the bonds of an authority may be additionally secured by a deed of trust or mortgage lien on part or all of the physical properties of the authority, and franchises, easements, leases, and contracts and rights relating to those properties. The trustee may operate the properties, sell the properties for payment of the bonds or interest on the bonds, and exercise all other powers and authority for the further security of the bonds.

(b) The trust indenture, regardless of the existence of the deed of trust or mortgage lien on the properties, may:

(c) A purchaser under a sale under a deed of trust or mortgage lien is the absolute owner of the properties, facilities, and rights purchased and may maintain and operate the properties.