The construction in 1668–1671 of Le Vau's "enveloppe" around the outside of Louis XIII's red brick and white stone château added state apartments for the king and the queen. The addition was known at the time as the "château neuf" (new château). The "grands appartements" (Grand Apartments, also referred to as the State Apartments) include the "grand appartement du roi" and the "grand appartement de la reine". They occupied the main or principal floor of the "château neuf", with three rooms in each apartment facing the garden to the west and four facing the garden parterres to the north and south, respectively. The private apartments of the king (the "appartement du roi" and the "petit appartement du roi") and those of the queen (the "petit appartement de la reine") remained in the "château vieux" (old château). Le Vau's design for the state apartments closely followed Italian models of the day, including the placement of the apartments on the main floor (the "piano nobile", the next floor up from the ground level), a convention the architect borrowed from Italian palace design.