Throughout the 1970s construction continued, starting with the Mathematical Sciences Building, followed by the Offenhauer Towers in 1971 and Industrial Education & Technology Building in 1972. The Business Building and the Industrial Arts Building opened in 1973 and University Hall received renovations in 1974 that included new seating, an improved sound system, and air conditioning in the auditorium. In 1979, the Student Recreation Center and the Moore Musical Arts Center opened. In 1970, the Board of Trustees ended an alcoholic beverage ban on campus. The Cardinal Room, an on-campus eatery, began serving beer. A growing trend in the late 1960s and early 1970s was the development of large apartment complexes adjacent to campus. By the 1970s approximately 4,000 students lived in private, off-campus housing. On campus, Darrow Hall became the first co-ed residence hall in 1972 with men and women inhabiting alternating floors.