The National Palace is the seat of the federal executive in Mexico. Since 2018 it has also served as the official residence for the President of Mexico. It is located on Mexico City's main square, the Plaza de la Constitución. This site has been a palace for the ruling class of Mexico since the Aztec Empire, and much of the current palace's building materials are from the original one that belonged to the 16th-century leader Moctezuma II.