Founded by Joaquín Pérez-Goicoechea and Nasser B. Abulhasan, the firm AGI architects has won the competition to renovate and expand Castilfalé Palace, which harbors the Municipal Archive of Burgos. Adjacent to the palace, the enlarged archive depot will be concentrated in the extension, an opaque corner volume that features a double technical wall, highly insulated to ensure that the documents inside are well preserved. The new construction shows a base of stone and wood under two stories presenting a stepped profile.

The palace incorporates new uses differentiated by levels: the ground floor for events, conferences, and concerts; the one above it for multipurpose classrooms; the next with an area for exhibitions; and the top for archive-related activities, including rooms for research and consultations. The project pursues the energy-efficiency standards of a Passivhaus building.