Commissioned by Alonso González de la Rúa, treasurer of the Catholic Monarchs. It is sober and military in appearance. A 15th-century late Gothic palace. The façade features an entrance with a voussoir round arch, decorated with the coats of arms of the Rúa and Cienfuegos families. There is a recently roofed courtyard and a beautiful garden inside the building. It is currently an Events Centre.