by A. Quincy Jones - Jones & Emmons of Los Angeles, the tower is tall and contains 48 bells, cast in France. The bells cover four chromatic octaves and weigh from 28 to 5,091 pounds. Live performances generally occur Wednesdays at noon during the academic year, with occasional performances scheduled on the weekends. The Commons student center was previously located directly northwest of the Bell tower. The four-decade old building was demolished at the end of 2005, and construction is under way to more than double the size of the center from 65,000 to . The first phase of the new $50 million Commons was recently completed, and includes meeting rooms, dining areas, places to study, and office space for student programs. And in March 2009, the Commons officially changed its name to the Highlander Union Building, or "The HUB" for short. Southeast of the Bell tower is the Tomás Rivera Library, the main library. Further southeast past the intersection of Citrus and Eucalyptus Avenues are the buildings that make up the instruction halls and research centers of the College of Natural and Agricultural Sciences, including some of the original 1917 buildings. Forming the southeastern border of the Riverside campus are the Botanic Gardens, which occupy of rugged terrain in the Box Springs foothills. Prominent natural features include two arroyos and a variety of plants native to the site. More than four miles (6 km) of hiking trails traverse the grounds. The 215/60 freeway's University Avenue underpass separates the city and the university. Painted on the support walls of the underpass is the Gluck Gateway Mural, a mural of Riverside and UCR history from the days before the Citrus Experiment Station through 2000, the year the mural was painted. West campus notable features Of the of UCR property comprising the West Campus, approximately are citrus groves and row crops used primarily by the College of Natural and Agricultural Sciences. University Extension, the USDA Germplasm Repository, International Village (student housing), a parking lot, office buildings (Human Resources and Highlander Hall), and other small no are also located on the West Campus. University Village, a mixed-use development located across from University Avenue adjacent to the freeway, provides a movie theater, stores, restaurants, office space, an apartment complex, as well as a parking structure and surface parking. The movie theaters serve as lecture halls during the day. Future capital expansion plans will convert