The palace was sold in 1808 by his son Luigi (1769—1836), ruined by gambling debts, to the state property of the Realm of Italy, which established the Ministry of War there.

[2] In spite of the many alterations carried out both during the Austrian period and in the first decades of the 20th century (culminating with the construction of a new wing overlooking the via del Carmine in 1935) and the successive bombings to which the building was subjected, the interiors still preserve intact on the piano nobile most of the 18th-century decorations originally present, which can be found in the deed of sale of the palazzo (1808).

[3] Instead, the original furnishings and a large part of the garden, notoriously a place for parties and balls particularly dear to Ferdinando Cusani, were almost completely lost.

From an architectural point of view, one must note the peculiarity of the so to speak exuberant forms of the exterior façade, an anomaly when compared to Milanese buildings of the time, which betrays the Roman influence of Giovanni Ruggeri.

In fact, it is no coincidence that the façade is reminiscent of the Late Roman Baroque, in which windows with mixtilinear frames and bulging balconies stand out.