Its entrance faces Williamson Square. It has seven bays and is in three storeys. The central three bays project forward. They are surmounted by a broken pediment. On the ground floor the central bays contain three entrances. These are separated by pillars. These lead to a recessed porch. Over each entrance is an architrave containing a fanlight. The lateral bays contain two round-headed and one flat-headed entrance on each side. There are three blind round windows. In the middle storey the bays are separated by pilasters. The three central bays each have a balustrade and a window with a tympanum containing a roundel. Each of the three lateral bays contains a window with a cornice, and a round window above it. Along the top storey are oculi between panelled pilasters. On the summit of each of the two lateral bays is a cupola on a short Tuscan colonnade. 