The Victorian Gothic structure is still used to house the administrative offices of the University. Canevin Hall, named after bishop of Pittsburgh Regis Canevin, was constructed in 1922 and is the oldest classroom building on campus; it was renovated in 1968 and again in 2009. These two buildings, as well Bayer Hall, the Richard King Mellon Hall of Science (designed by Ludwig Mies van der Rohe), and the Victorian Laval House, are at the west end of Academic Walk, a thoroughfare that provides pedestrian-only access to most of the campus, including the Student Union.