The museum of the Templo Mayor was built in 1987 to house the Templo Mayor Project and its finds—a project which continues work to this day. In 1991, the Urban Archeology Program was incorporated as part of the Templo Mayor Project whose mission is to excavate the oldest area of the city, around the main plaza. The museum building was built by architect Pedro Ramírez Vázquez, who envisioned a discreet structure that would blend in with the colonial surroundings. The museum has four floors, three of which are for permanent exhibitions and the fourth houses offices for the director, museum administration and research staff. Other departments are located in the basement, where there is also an auditorium.