It houses the Executive Power and is a mansion in Baroque style made of quarry stone dating back to 1665. 

The interior features 111 arches and 5 majestic murals that depict a significant part of Aguascalientes' history. These murals were hand-painted by Oswaldo Barra Cunningham, a Chilean muralist. 

The titles of the murals are: "Aguascalientes in History," "San Marcos Fair," "Interpretation of the Flag's Colors," "The Aguascalientes Convention," and "The Battle of the Great Nopalera."