L'Oréal Group has its head office in the Centre Eugène Schueller in Clichy, Hauts-de-Seine, near Paris. The building, constructed in the 1970s from brick and steel, replaced the former Monsavon factory, and employees moved into the facility in 1978. 1,400 employees work in the building. Klawitter added that the facility "gives the impression of a high-security zone" due to the CCTV cameras and security equipment. The world's largest hair salon is located inside the head office building. As of 2005, 90 hairdressers served 300 women, including retirees, students, and unemployed people, per day; the customers are used as test subjects for new hair colours.