This industry is one which is concerned with the preparation and construction of real estate properties. The repairing of any existing building or making certain alterations in the same also comes under this sector. This sector also includes companies mainly engaged in the construction of buildings which include the construction of a house, farm, industrial, commercial or other building structures, and carrying out alterations, additions, and renovation or general repairs to these buildings. Establishments primarily engaged in the construction of buildings for sale, such as developers, are included, as are companies that are mainly involved in renting or leasing real estate to others; managing real estate for others; selling, buying or renting real estate for others; and providing other real estate related services, including appraisal services. The construction of non-building or heavy construction structures includes the construction or general repair of roads, highways, streets, public sidewalks, bridges, guardrail construction, airport runways or parking lots, and organizing or managing their construction, including on-site assembly. Also Included are installation of road signs, providing architectural supervision or consultant engineering services, as well as services such as site preparation, building structure and completion.?