The tower, which is also known as Reizabal and Monzón, is an austere, imposing limestone building from the early 16th century.
it has two sections: an upper tower-shaped one; while the other lower one is rectangular. Its highlights are two large cylindrical features or sentry boxes that can be seen on the corners of the tower and at the ends of the more elongated section. These features project out from the cornice, like pinnacles, and they are topped by ornate torch-holders. Toward the middle of the 17th century, the tower-shaped section was fitted with a richly carved Baroque eave. On the space between its rafters there is an inscription that reads: “M santissima conzebida sin mancha de pecado original. Amén”. [Holy Mother conceived without original sin. Amen] This house was the birthplace for the following: Miguel José de Olaso, Perpetual Secretary of the Real Sociedad Bascongada de los Amigos del País-Royal Basque Society of Friends of the Country (18th century); Telesforo Monzón y Zurbano, a famous politician and director of the Royal Seminary of Bergara (19th century); and Telesforo Monzón Ortiz de Urruela, a leading Basque nationalist politician during the Spanish Republic (1930s) and throughout the whole of the second half of the 20th century. It is now the seat of Jakiunde – Academy of the Sciences, Arts and Letters.