In this subtitle the following words have the meanings indicated. “Affected property” has the meaning stated in § 6–801 of the Environment Article. “Residential property” means a building or a portion of a building that provides complete living facilities, including facilities for cooking, sanitation, and sleeping. “Residential property” includes: a single–family unit in a multifamily dwelling; and a “rental dwelling unit” as defined under § 6–801 of the Environment Article.