As used in this chapter: “Based assessed value” means the assessed value of real estate within a housing revitalization zone as shown upon the records of the local assessing officer on January 1 of the year preceding the date of the designation of such zone. “Business firm” means any corporation, partnership, electing small business (Subchapter S) corporation, limited liability company, or sole proprietorship authorized to do business in the Commonwealth and subject to tax imposed under Articles 2 (§ 58.1-320 et seq.) and 10 (§ 58.1-400 et seq.) of Chapter 3, Chapter 12 (§ 58.1-1200 et seq.), Article 1 (§ 58.1-2500 et seq.) of Chapter 25, or Article 2 (§ 58.1-2620 et seq.) of Chapter 26 of Title 58.1. “Department” means the Department of Housing and Community Development. “Fund” means the Housing Revitalization Zone Fund. “Housing revitalization zone” means an area declared by the Governor to be eligible for the benefits of this chapter. “Housing unit” means any building, structure, or portion thereof, which is occupied as, or intended for occupancy as, a residence by one or more families. “Local zone administrator” means the chief executive of the county, city, or town in which a housing revitalization zone is located, or his designee. “Planning district” means a contiguous area within the boundaries established by the Department of Housing and Community Development. “Qualified business firm” means a business firm designated as a qualified business firm by the Department pursuant to § 36-165. “Qualified owner occupant” means the owner of a housing unit who also uses the housing unit as the owner’s residence, and who is designated as a qualified owner occupant pursuant to § 36-165.