Architecture by Álvaro Siza. Designed with landscape architect Sidónio Pardal, the project adds an angular concrete extension to the renovated monastery. The landmark is a minimalist white concrete building with a pair of towers and a sheltered entrance between them. Openings punctured into the towers and roof draw light into the extension, creating a play of light and shadow across the interior.

In the courtyard stands a concrete sculpture named Wayfarer, referencing the structure's proximity to the Camino de Santiago. The extension was led by the Livraria Lello Foundation.