Building adjoining the mansion that bears the same name as the convent. Together with the mansion, it has been classified as a Historic-Artistic Monument on a national scale. It was erected over the ancient Chapel of San Cristóbal by Fernando de Andrade, Archbishop of Santiago and Viceroy of Navarre in the 16th century. One of the mansion´s three towers was partially destroyed and moved, in the 17th century, to the convent. A large arch provides communication between the civil building and the religious one, also providing a route around it.