Former residence of the Ciocchi Di Monte family, the palace is now the civic seat of the city, housing the municipal offices, the City Council Hall, and the Municipal Picture Gallery, established in 1680 and preserving portraits of notable citizens of Monte San Savino and members of Tuscany’s ruling families.

Construction began in 1515 at the behest of Cardinal Antonio Di Monte and was designed by Antonio da Sangallo the Elder. The building was completed and expanded in subsequent decades, with contributions by Nanni di Baccio Bigio and decorations by Giorgio Vasari, including now-lost paintings of the Four Seasons once displayed in one of the noble-floor halls. Since the 19th century, the palace has been municipally owned and has undergone significant restorations, particularly in the late 1970s.

The main façade in pietra serena and the inner courtyard with its loggia and groin vaults exemplify Renaissance elegance, while the hanging garden and open-air theater at the rear offer splendid views of the town and surrounding hills. Inside, frescoes, decorated ceilings, and the Picture Gallery provide an outstanding journey through art, history, and civic identity, with works by I. Dini, R. Guelfi, D. Sozzini, and other local masters.

Visitors to Monte San Savino should not miss the 16th-century cistern, recently restored and now accessible via a metal walkway (free admission). Located beneath the hanging garden of Palazzo Di Monte, the cistern consists of two naves measuring 26 × 5 meters each, covered by barrel vaults and connected by four large round arches.

Built with mixed materials — stone and brick — it collected spring water from the surrounding area as well as water from the Butarone stream, originally supplying the entire community. Designed by Nanni di Baccio Bigio, it is today one of the largest water reservoirs in Tuscany, second only to those of Livorno. Its waters are now used to irrigate the garden above, while the remains of the old fountain outlets recall its former public function.