The rectangular campus plan and its placement, on the flat plain rather than in the foothills, were intended to provide for expansion of the University through a series of quadrangles extending laterally from the original main quadrangle. In the decades between the 1906 earthquake and World War II, a series of buildings were designed by the San Francisco architecture firm of Bakewell and Brown, and constructed to the east of the main quadrangle: Green Library West, the School of Art and Art Gallery, and Hoover Tower; these were intended to be joined by covered arcades into a second quadrangle. Interrupted by World War II, the connecting arcade plan was subsequently abandoned.
As the university continues into its second century, campus planning and development returns to the original concept of quadrangles and connecting malls as seen in the completion of the new Science and Engineering Quad (SEQ) and the Serra Mall, which extend the original axis from the Main Quad westward, and connect that original feature with more technically -- and technologically -- advanced structures.
The Board of Trustees has reserved some 6,200 acres for educational uses. This is the heartland of the Farm, composed for the most part of the central portion running from El Camino Real to the back boundary in the foothills. About 1,980 acres are under lease for light industrial, commercial and other income-producing uses.
Within the 6,200-acre academic reserve are several major areas. The 2,300-acre central campus includes the Main Quad and other classroom buildings, laboratories, libraries, residence halls, the golf course, athletic facilities, the Stanford Linear Accelerator Center and faculty/staff housing subdivisions.
Outside of the main campus center, much of Stanford land is rural, with ecosystems ranging from working farms and pasture land to the 1,190-acre Jasper Ridge Biological Preserve set aside for biological studies and used extensively for research in population biology, ecology, plant physiology, and anthropology. Some of the research projects in this preserve date back to the days of President-Biologist David Starr Jordan. Some 2,700 acres are open or lightly used lands, such as the agricultural lands along Highway 280 and the rolling hills along Page Mill and Sand Hill Roads.