Municipal Palace (Palacio del Ayuntamiento) faces the Zócalo's s. side (M: Zócalo, line 2). It serves as City Hall. The original building at the square's southwest corner dates from 1724. On the front arcade are coat-of-arms mosaics depicting Mexican cities, states and regions, including Coyoacán, site of the first city hall in the Valley of Mexico; the 1168 founding of Aztec capital Tenochtitlan; and the Villa Rica de la Vera Cruz, said to be the first city hall in the continental Americas.
In order to see the Hall of Rulers (Salón Virreyes) and the Legislative Assembly Hall (Sala de Cabildos) visitors must present identification and sign in at the visitor desk on the first floor. The exhibit halls are located on the second floor. The Hall of Rulers is a collection of paintings—including one of Hernando Cortés—displayed in two rooms. Adjacent to these rooms is the room where the Mexican legislative assembly met until 1928; it contains original furniture.