“The Palace of the Argentine National Congress” Is The National Congress Building of Argentina. It Is a Monumental building And Seat of the Argentine National Congress. The Building located in Buenos Aires at the western end of Avenida de Mayo. The Construction of This Building Start between 1898 and 1906. The Palace is a National Historic Landmark. The palace is in the Neoclassical style, largely made of white marble with elaborately furnished interiors.