Medieval tower modified in the 16th and 18th centuries, it was undoubtedly one of the most important in the region of Markina. Without forgetting its defensive capacity, it was at the same time the residence of the family. From there they would control the iron making, the mill, the bridge, the hermitage, the fields and the meadows, from which they extracted an economic and social return. With a cubic construction and a hipped reinforced roof, despite the additions that have spoiled its image, it maintains the embrasures, the pointed windows and the two gothic arched entrances. Like its rival, Ugarte, it had a weapons courtyard.
Linked to the tower are the hermitage of San Joaquín y Santa Ana, in a baroque style with a facade of ashlar masonry, a small gantry on top of two Tuscan columns and a canvas of the titular saints. The Olazar forge, close to the Artibai River and neighboring the Oxillain farmhouse, which maintains part of its ancillary rooms, now consolidated, but does not on the contrary retain any mechanical element; and the Oxillain mill disappeared in the floods of 1983.
Close to these facilities, visible from the parking lot of the soccer field is the Oxillain dam. It is a dam with two arches designed by P. B. Villareal de Bérriz (1669-1740), a pre-illustrated character and pioneer in the construction of arch dams. From the dam we see Torrezar (Atxondoa neighborhood). It stands on rock and as its name indicates (zar = old), it is one of the oldest in the municipality. The initial tower has been altered with the addition of another construction of similar dimensions.
