Despite reconstruction it remains possible to observe some Gothic features as the rib vaults and the pointed arches.

It is considered an asset of cultural interest since 17 July 1984, in the category "National Historic-Artistic Monument".

Some claim that in 1334 Alfonso XI of Castile ordered to build a fortress and wall that were used like a dike against the flood.

The last flood was in 1983 and resulted in furniture, drag doors and railings inside the church being destroyed.

Restoration work undertaken by Sabino Goikoetxea changed much of the original design of the church.

In the 14th century the population and the economy grew, carrying Gothic art and architecture into Biscay.

As the French influence entered by Navarre, it avoided the Basque Country, meaning that the Gothic style was common in Biscay even later than much of Spain.

Even then, there are few large Gothic projects in the region, with Santiago's cathedral in Bilbao or Andra Mari of Lekeitio as notable exceptions.

At the top of the entrance the coat of arms of the chapel's founders (the Lezama-Leguizamón family) are displayed.

It possesses similar attributes of those present in the Chapel of Provost, having a Gothic structure in the entrance arch, rib vault on the ceilings and stained glass windows.

The top part of this grille includes the coat of arms of the Recalde family along with details of the Passion.

The intermediate frieze contains the following inscription written in Latin: "O Mater Dei, memento mei Iesu".

This chapel is composed by a rib vault and a small blinded Gothic arch in the right wall.

Around the arches there are small sculptures of low relief, with the form of heads, symbol of the anthropocentrism that dominated the Renaissance.

The great majority of the heads contain wings of angels behind them; and middle these, in the central keystone, there is a larger sculpture in the form of a shield with the year 1548 recorded in it, as a signature of the builder.

These are smaller in comparison with other buildings, but they contain all the essence of the syle: a Corinthian capital with its rectangular annulet and abacus and its acanthus' leaves, some coiled forming "caulículos".

In 1774 the construction of the present Belfry Tower was begun by Gabriel de Capelastegui, replacing an earlier structure.

The last contributions date from 1902: the new portico in front of the Ronda street, the new sacristy and the large parroquial dependences.