All four campus areas are connected by bus services, the majority of which connect the North and Central campuses. There is a shuttle service connecting the University Hospital, which lies between North and Central campuses, with other medical facilities throughout northeastern Ann Arbor. Central Campus was the original location of U-M when it moved to Ann Arbor in 1837. It originally had a school and dormitory building (where Mason Hall now stands) and several houses for professors on of land bounded by North University Avenue, South University Avenue, East University Avenue, and State Street. The President's House, located on South University Avenue, is the oldest building on campus as well as the only surviving building from the original campus. Because Ann Arbor and Central Campus developed simultaneously, there is no distinct boundary between the city and university, and some areas contain a mixture of private and university buildings. Residence halls located on Central Campus are split up into two groups: the Hill Neighborhood and Central Campus. Central Campus is the location of the College of Literature, Science and the Arts, and is immediately adjacent to the medical campus. Most of the graduate and professional schools, including the Ross School of Business, the Gerald R. Ford School of Public Policy, the Law School and the School of Dentistry, are on Central Campus. Two prominent libraries, the Harlan Hatcher Graduate Library and the Shapiro Undergraduate Library (which are connected by a skywalk), are also on Central Campus. as well as museums housing collections in archaeology, anthropology, paleontology, zoology, dentistry and art. Ten of the buildings on Central Campus were designed by Detroit-based architect Albert Kahn between 1904 and 1936. The most notable of the Kahn-designed buildings are the Burton Memorial Tower and nearby Hill Auditorium. North Campus is the most contiguous campus, built independently from the city on a large plot of farmland—approximately —that the university bought in 1952. It is newer than Central Campus, and thus has more modern architecture, whereas most Central Campus buildings are classical or Collegiate Gothic in style. The architect Eero Saarinen, based in Birmingham, Michigan, created one of the early master plans for North Campus and designed several of its buildings in the 1950s, including the Earl V. Moore School of Music Building. North and Central Campuses each have unique bell towers that reflect the predominant architectural styles of their surroundings. Each of the bell towers houses a grand carillon. The North Campus tower is called Lurie Tower. The University of Michigan's largest residence hall, Bursley Hall, is located on North Campus.