Architectural plans: stall floor plans and sections for original project (1914) and adaptation (1943), San Sebastian

Despite its size and complexity, the "Bellas Artes" was built in just 5 months, thanks to the innovative use of reinforced concrete, a revolutionary technique, still very unknown in Spain by then, especially for cultural buildings. This industrial construction system allowed Cortázar to design modern structures and large spaces, while complying with the highest fire-resistance regulations needed for public spaces.