The Unité d'Habitation in Marseille, France was Le Corbusier's first large-scale housing project completed in 1952. It consisted of 337 apartments spread across 18 floors designed with communal spaces like shops and a roof garden to encourage social interaction. The building used reinforced concrete and employed Le Corbusier's modular system to ensure proper human scale. It was an early example of high-density housing that influenced the Brutalist style through its use of exposed concrete construction.