All real property owned or held by a regional housing authority for the purposes of the Regional Housing Law shall be exempt from levy and sale by virtue of an execution, and no execution or other judicial process shall be issued against property of the regional housing authority or shall any judgment against a regional housing authority be a charge or lien on the regional housing authority’s real property; provided, however, that the provisions of this section shall not apply to or limit the right of obligees to pursue any remedies for the enforcement of any pledge or lien given to them on rents, fees or revenues