In this part the following words have the meanings indicated. “Interested party” means: the person who last appears as owner of the real property on the collector’s tax roll; a mortgagee of the property or assignee of a mortgage of record; a holder of a beneficial interest in a deed of trust recorded against the real property; a taxing agency that has the authority to collect tax on the real property; or any person having an interest in the real property whose identity and address are: reasonably ascertainable from the county land records; or revealed by a full title search consisting of at least 50 years. “Tax” has the meaning stated in § 14–801 of this subtitle.