It is located in the Plaza of Our Lady of the Pillar, and is built in the Renaissance Revival style.
[1] The city council was held from the Middle Ages in the Casas del Puente, named for their proximity to a bridge over the river Ebro.
[2][3] A competition was held, and the design by Alberto Acha, Mariano Nasarre and Ricardo Magdalena Gayán won in 1941.
In 1945, the plan was set for the foundation and frame at a price of 5 million Spanish pesetas, and work began on 2 January 1946.
A reason for the costs and length of construction was that it was not built by large companies, but by guilds of master craftsmen.