Rocca Salimbeni is one of the most beautiful palazzos of Italy.

The middle floor is decorated with six delightful three-fold windows surmounted with ogive arches with the coats-of-arms of nobles families. The cornice under the roof rests on round archer supported by pedestals and bears the battlements which are decorated with four-lobed panels.

On the right side is Palazzo Spannocchieschi, a Renaissance building designed by Giuliano da Maiano(1473). It is of bossed stone, three storeys high, each storey separated from the other by a cornice; it has two rows of double windows surmounted with round arches and tympanums. Beneath the roof are medallions with busts.

On the left side of the square is Palazzo Tantucci, a Renaissance building by Riccio (1548). The three palaces are now the seat of the Bank Monte dei Paschi di Siena, founded in 1472.
This bank has a fine collection of paintings, tapestries, wood carvings, bronze and wrought iron decorations, besides some relics of great interest for the history Italian credit, such as seals, old manuscripts and registers, and other works of art which are viewable by appointment.

A good collection of pictures, tapestries, wood carvings, old manuscripts  is also ranged within the rooms :

Madonna della Misericordia by Benvenuto di Giovanni.
Two Saints evangelists by 
Salomč by Domenico Beccafumi.
Pietą di Lorenzo Rustici.
Madonna by Raffaello Vanni.
Pietą by Arcangelo Salimbeni.
Bacco by Antonio Federighi.
Crucifixion by Pietro Lorenzetti.
Lamento della Vergine sul Cristo deposto by Maestro dell' Osservanza
Madonna with child and St. Jean by Benedetto da Maiano.
Madonna with child by Benvenuto di Giovanni
Madonna dell' Umiltą by Giovanni di Paolo
Santa Lucia by Beccafumi
Sant' Antonio Abate by Sassetta
Other works of art