All real property of an authority, including an authority created under Indian laws recognized by the federal government, is exempt from levy and sale by virtue of an execution, and no execution or other judicial process may issue against the same nor may any judgment against any authority be a charge or lien upon its real property. The provisions of this section, however, do not apply to nor limit the right of obligees to foreclose or otherwise enforce any mortgage of an authority or the right of an obligee to pursue any remedies for the enforcement of any pledge or lien given by an authority on its rents, fees, or revenues.