The Old Customs Building is located on the east side of Santo Domingo Plaza between Republica de Venezuela and Luis Gonzalez Obregon Streets just to the north of the main plaza of Mexico City. The land here originally belonged to several nobles, including the Marquis of Villamayor. The Royal Customs office was in charge of the regulation of imported merchandise into New Spain and taxing the same, becoming the largest source of revenue for the government. The office originally was on 5 de febrero Street but was moved into the Villamayor house in 1676 because of its location next to Santo Domingo Plaza. Eventually, the government bought the house and rebuilt it in 1730, which is the building that survives today. Eventually, the Customs office in Mexico City closed and it was taken over by the Secretariat of Public Education in the early part of the 20th century.