The Floor of State
The first floor of the White House Residence is often called the "State Floor," because this is where formal receptions of state are held. This floor is at the same level as the second floor of the West Wing and the East Wing because the Residence sits on higher ground. This floor has 8 rooms, 1 main corridor, 1 entrance hall.
The First Floor Mezzanine
Over the Butler's Pantry, Usher's Office, and first floor elevator lobby is a mezzanine (a partial floor level) that includes some small closets and another pantry for pastry cooking as well as the clock room.