Palazzo Annoni, set up at the start of corso di Porta Romana, was built by Francesco Maria Richini, who is the most noteworthy exponent of a dynasty of Milanese architects.
The building was constructed during the fourth decade of the seventeenth century by Paolo Annoni, a rich silk merchant.
The building has an imposing facade and delimited by two ashlar strips (the front of the external wall of the buildings) and two sections of alternately centred windows and a pediment, it has a central door, with two columns to either side which support the balcony.
Currently, Palazzo Annoni is a private property, that, nevertheless, is part of the initiative "Cortili Aperti" (Open Courtyards), an exhibition that consists of the discovery and rediscovery of unknown and little known places.
It has become, over the years, an annual date for many tourists and citizens seeking out the city's beauties, that as well as showing the elegance of the architecture, also shows off civil life.