It is owned by the Fondazione Primoli and the city of Rome and houses several museums and collections.

He extended and partly modernised the palazzo with a new facade and entrance between 1901 and 1911.

In 1927 Giuseppe Primoli donated the palazzo and his collections to the municipality of Rome.

[1][2] The Museo Napoleonico is located on the palazzo's ground floor, and the third floor is occupied by the Museo Mario Praz, the former residence of Mario Praz.

Also located in the palazzo is the Fondazione Primoli with the Count's library and photographic archive.