The main campus of the University of California, Riverside (UCR) is located within the city of Riverside in western Riverside County, three miles (5 km) east of downtown, and comprises bisected by the Interstate 215/State Route 60 freeway. Nearly half of the total area is devoted to agricultural teaching and research fields, most of which are located west of the freeway. Development history The original buildings that formed the earliest kernel of the campus included the UC Citrus Experiment Station laboratory, residential buildings, and barn, all of which are still in use today, although for different purposes. They were designed by Lester H. Hibbard of Los Angeles, a graduate of the University of California School of Architecture, in association with a colleague, H.B. Cody. Built at a cost of $165,000, the architecture of the major buildings followed the Mission Revival style suggesting the Spanish colonial heritage of Southern California. The site eventually opened in 1917. A third building, the North Wing, now known as Chapman Hall, was attached to the CES in 1931. Further major construction largely ceased on the site until the groundbreaking for the new College of Letters and Science in April 1951. A group of five buildings in decidedly more Modern styles were completed by 1954: the Tomás Rivera Library, Webber Hall, Geology Building, Physical Education Building and Watkins Hall. These buildings were all constructed out of reinforced concrete and brick and designed by different architects paid for by state appropriation. The library was designed by the firm of Latta & Denny and constructed at a cost of $625,829. The Webber hall was designed by Chambers & Hibbard and cost $1,135,960, partially paid by State Fair and Exposition funds. The Geology Building cost $857,800 and was designed by Bennett & Bennett. The Physical Education building cost $983,000 and was designed by Arthur Froehlic. The Social Sciences Building, later renamed Watkins Hall, was designed by the firm of Clark & Frey and cost $1,051,000. In 1955, UCR purchased the 275 unit Canyon Crest housing complex, previously used by personnel stationed at nearby March Air Force Base, for use as student family housing. After five years of construction, UCR's first residence hall, the Aberdeen-Inverness, was completed in 1959. It was designed by the firm of Allison and Rible at a cost of $3,839,000 paid for by Federal loan funds. After the Regent's designation of UCR as "general campus" of