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The University of Arizona (also referred to as UA or U of A) is a land-grant and space-grant public institution of higher education and research located in Tucson, Arizona, United States. The University of Arizona was the first university in the state of Arizona, founded in 1885, when Arizona was still a territory and is considered a Public Ivy. UA includes Arizona's only allopathic medical school. In 2006, total enrollment was 36,805 students.
The University of Arizona was approved by the Arizona Territorial Legislature in 1885. The city of Tucson had hoped to receive the appropriation for the territory's mental hospital, which carried a sum of money slightly larger than the $25,000 allotted to the territory's only university (the antecedent to Arizona State University was also chartered in 1885, but it was created as Arizona's normal school, and not a university). Tucson, having a smaller contingent of legislators than cities like Prescott and Phoenix, was granted last priority and was awarded the university, which disappointed many city residents. With no parties willing to step forth and provide land for the new institution, the citizens of Tucson prepared to return the money to the Territorial Legislature until two gamblers and a saloon keeper decided to donate the land necessary to build the school. Classes met for the first time in 1891 with 32 students in Old Main, the first building constructed on campus, and still in use to this day.

The campus is roughly divided into quadrants. The north and south sides of campus are delineated by a grassy expanse called the Mall, which stretches from Old Main eastward to the campus' eastern border at Campbell Avenue (a major north-south arterial street). The west and east sides of campus are separated roughly by Highland Avenue and the Student Union Memorial Center.
The science and mathematics buildings tend to be clustered in the southwest quadrant; the intercollegiate athletics facilities to the southeast; the arts and humanities buildings to the northwest (with the dance department being a major exception as its main facilities are far to the east end of campus), with the engineering buildings in the north central area.

The main campus sits on 380 acres (1.5 km�) in central Tucson, about one mile (1.6 km) northeast of downtown. There are 179 buildings on the main campus. Many of the early buildings, including the Arizona State Museum buildings (one of them the 1927 main library) and Centennial Hall, were designed by Roy Place, a prominent Tucson architect. It was Place's use of red brick that set the tone for the red brick facades that are a basic and ubiquitous part of nearly all UA buildings, even those built in recent decades. Indeed, almost every UA building has red brick as a major component of the design, or at the very least, a stylistic accent to harmonize it with the other buildings on campus.