Roughly three-quarters of Rice's undergraduate population lives on campus. Housing is divided among eleven residential colleges, which form an integral part of student life at the university (see Residential colleges of Rice University). The colleges are named for university historical figures and benefactors, and while there is wide variation in their appearance, facilities, and dates of founding, are an important source of identity for Rice students, functioning as dining halls, residence halls, sports teams, among other roles. Rice does not have or endorse a Greek system, with the residential college system taking its place. Five colleges, McMurtry, Duncan, Martel, Jones, and Brown are located on the north side of campus, across from the "South Colleges", Baker, Will Rice, Lovett, Hanszen, Sid Richardson, and Wiess, on the other side of the Academic Quadrangle. Of the eleven colleges, Baker is the oldest, originally built in 1912, and the twin Duncan and McMurtry colleges are the newest, and opened for the first time for the 2009–10 school year. Will Rice, Baker, and Lovett colleges are undergoing renovation to expand their dining facilities as well as the number of rooms available for students.