[1] The Palazzo is 5 floors high with hundreds of rooms, linked each other by a series of crossed itineraries.

[2] The imposing three-arched entrance of the Palazzo della Presidenza, the staircase of honor of the Palazzo degli Uffici, the room of the Council of Ministers and the entrance hall of the staircase at the piano nobile, with its wood, marble and stucco decorations, are especially noteworthy.

The boardrooms of the Minister are placed in a side complex, linked to the main building by an arched junction.

The gardens and the terraces are overbuilt and abut onto the surrounding streets, standing out of the road surface.

In fact, almost opposite to the back façade there is the little palace that housed the Royal Institute for Physics, in which Enrico Fermi carried out his experiments together with the Via Panisperna boys (so called because the little palace is closer to the exit on Via Panisperna).