Here the two general assemblies of the Commercial Association of Porto are held annually. Designed by Tomás Soller between 1879 and 1883 and later modified by José de Macedo Araújo Júnior between 1883 and 1890, the entire room, with the exception of the chandelier in the center, weighing about a ton, is an immense optical illusion, given the way artisans Using plaster, they managed to make their walls, if not, seem made of wood. Its roof was renovated in 2014.