In 1883, the first permanent building, Old Main, was completed. Old Main remains prominent on campus, housing administration offices, Levitt Hall, and Sheslow Auditorium, and as the site of many United States presidential debates, and other events. The university's law school–the second oldest law school in the country west of the Mississippi River, after Saint Louis University School of Law–was established in 1865, by Chester C. Cole, who served on the Iowa Supreme Court from 1864 to 1876. Drake's first international students enrolled for classes in 1886, and were citizens of China, Persia, Armenia, and Japan. The first campus library opened on June 16, 1908. In 1920, due to a housing crisis, the University allowed social fraternities to use Greek letter emblems and affiliate with national offices.