Used as chambers for the court members and the military entourages of sovereigns, this floor was never decorated.
Its architectural layout dates back to the architect Juvarra and essentially remained unmodified until the 1800s when a decision to utilize the building for military purposes necessitated radical changes. According to the 18th century project, the large rectangular chambers contained thirteen smaller apartments that were periodically used by members of the court and the military entourages of sovereigns.