The Casa de los Condes de San Mateo Valparaíso was designed by Guerrero y Torres, who also built the Palacio de Iturbide. During the office hours of Banamex, headquartered here (weekdays), visitors can take a look inside this superb 18C palace and admire the patio with its segmental arches, the bold double helix staircase and two 18C screens.