The district "La Défense" is located in the north, separated by the circular boulevard. The district, developed since the end of the 1950s, is one of the principal business districts in Europe. It mainly consists of office buildings, but some notable dwellings can be found within the district as well (Tour Défense 2000, résidence Boieldieu). Two thirds of the territory of La Défense is located within Puteaux, the remainder being divided between Courbevoie and Nanterre. Thus, the CNIT, the Arche de la Défense and the Quatre Temps shopping mall are in Puteaux.