The palazzo was built between 1515 and 1517 by Antonio da Sangallo the Elder for cardinal Antonio Di Monte. The facade is characterised by the pietra serena rustication of the ground floor and the classical-style windows of the first floor. The rear facade, done later on a project by Nanni di Baccio Bigio, faces a small hanging garden planted on a tank used to collect water. Today, the building is the headquarters of the municipality.