According to a report in VeloceToday.com, the Italian government has declared the Alfa Romeo Mueum at Arese a National Treasure. Here is the article:

Alfa Romeo Museum: No One Can Touch it Now

Story by Roberto Motta - July 14, 2010

Over the past weekend, the Mayor of Arese, Gianluigi Fornaro told the Italian press that the Alfa Romeo Museum, with all the cars and all the valuable historical archives, cannot be moved from its home of Arese. Mayor Fornaro said that the Ministry of Culture (in the central government in Rome) has now accepted and officially announced that the Arese architectural structures and the headquarters building will be considered of National and Historic importance.
Last March, VeloceToday published an article about the effort being made by Italian politicians to help save the Alfa Romeo Museum. During a visit to the museum, Milan’s mayor Letizia Moratti assured the audience of her political commitment to involve the Ministry of Cultural Assets, so that the Alfa Romeo
Museum in Arese is officially considered a national treasure to be protected. In addition, she has committed to include the famous automotive center in the tourist routes of the Expo 2015 in order to protect the heritage preserved in the Museum at Arese. “I think it is right to continue to value the Arese Museum here where it is. It is an extraordinary museum, a patrimony that deserves to be bound by the Cultural Assets.”
The recent announcement of the Ministry of Culture means that this act safeguards the Alfa archives from being sent to any other destination, such as Turin. Fiat has so far issued no official statement in regards to this initiative.
We would like to remind the reader that the collection is still owned by the Fiat Group, but will not be dismantled or moved from its original location, so it is impossible to transfer any parts of the museum in Turin or any other city. This initiative, on the 100 year anniversary of Alfa Romeo, gives a future to the museum, which will become a magnet for the many fans that come to see the cars which made the glorious history of Alfa Romeo.