The building dates from the 15th century. It is also known as Palace of the Mújica. The façade is made of granite masonry, divided into two levels with no decoration. On one of the corners, a large tower stands. It has a square floor plan, and its parapet presents crenellations and smaller watchtowers. The tower's entrance has a semicircular arch and is framed by an alfiz. Inside we find a very well-preserved Mudejar coffered ceiling. King Alfonso XII stayed at this building, while the writer Enrique Larreta decided to place the main character of his novel Don Ramiro's Glory in it. At present, the building houses the headquarters of the Provincial Council.