Managing, maintenance and repair of cooling and heating power houses and water reservoirs and fountain of Iran Mega Mall Maintenance and repair of buildings and equipment of Central Bank of Tehran Managing and maintenance and repair of Tehran Milad tower Maintenance and repair and managing of telecommunications, electrical and mechanical equipment and building management system (BMS) and civil services and laboratory glassblowing of Research Institute of Petroleum Industry Maintenance and repair of buildings and equipment of Jahad Engineering Resarch Institue Maintenance and repair of telecommunications, mechanical and electrical equipment, cathodic protection system and protection of gas transmission network of Iran University of Science and Technology Maintenance and repair of Maksan Bank buildings’ civil, electrical and mechanical equipment Maintenance and repair of electrical and mechanical equipment of Parsian Azadi hotel