Director means the Director of the Department of Permitting, Inspections, and Enforcement or the Director's designee. Person authorized to make the sale means the person designated pursuant to the Maryland Rules to sell residential property subject to foreclosure. Residential property means real property improved by four or fewer single family dwelling units. Municipality means an incorporated city or town within Prince George's County. Commercial property means any improved and unimproved real property that is zoned industrial, commercial, or nonresidential use under the provisions of Subtitle 27 of this Code.