The building encloses a large central patio with ranges of two storeys, the windows set in slightly sunken panels between flat pilasters. Plain square tablets float in the space above each window. The building is surmounted by a balustrade, with rusticated obelisks standing at the corners. There is no sculptural decoration, only the discreetly contrasting tonalities of stone and stucco, and the light shadows cast by the slight relief of the pilasters against their piers, by the cornices, and by the cornice strips that cap each window.