This ornate town hall building is located in the old town square. The iconic building built in 1423 is where a rocket gets launched every July 6th at noon, announcing the beginning of the famous San Fermin festival.

The origin of the building dates to 1423 and the Privilegio de la Unión  charter that united the three historical boroughs of the city. King Carlos III had established  that the town hall would be built on the spot where the three medieval town converged.

The building was then renovated between 1753 and 1759, under a project by master Juan Miguel de Goyeneta. The façade was designed by José Zay y Lorda, and the sculptures were made by José Jiménez. There are two allegories over the main entrance: Prudence and Justice. At the top of the building are two figures of Hercules, symbolising civic virtues, and right at the top is the allegory of Fame, which announces the start of the city’s festivities. The current façade combines late Baroque and Neoclassical styles (18th century), although the rest of the building was rebuilt in the 20th century.