The Stevie Eller Dance Theater, opened in 2003 (across the Mall from McKale Center) as a dedicated performance venue for the UA's dance program, one of the most highly regarded university dance departments in the United States. Designed by Gould Evans, a Phoenix-based architectural firm, the theater was awarded the 2003 Citation Award from the American Institute of Architects, Arizona Chapter. The Computer Science department's webcam provides a live feed of the campus as seen from the top of the Gould-Simpson building (the tallest classroom building on campus at 10 stories). The Berger Memorial Fountain at the west entrance of Old Main honors the UA students who died in World War I, and dates back to 1919. The University of Arizona generates renewable energy with solar panels (photo voltaic) that have been installed on campus buildings. In 2011, the Sustainable Endowments Institute gave the university a College Sustainability Report Card grade of "B." In 2015, the university opened the ENR2, housing the University of Arizona School of Geography, Development and Environment set to be one of its "greenest" buildings on campus with features like a cutting edge air conditioning system and 55,000-gallon water-harvesting tank. Designed to resemble a slot canyon in the Sonoran Desert, the 150,000 sq. ft. building focuses on adaptation and reducing our carbon footprint. The oldest campus buildings are west of Old Main. Most of the buildings east of Old Main date from the 1940s to the 1980s (a period of tremendous growth on campus and in Tucson in general), with a few recent buildings constructed in the years since 1990. The Student Union Memorial Center The Student Union Memorial Center, on the north side of the Mall east of Old Main, was completely reconstructed between 2000 and 2003. It replaced a structure originally opened in 1951 with additions during the 1960s and early 1970s. The student union has of space on four levels, and includes 14 restaurants, a grocery market, a two-level bookstore with an office supplies section, 23 meeting rooms, eight lounge areas (including one dedicated to the USS Arizona), a computer lab, a U.S. Post Office, and a copy center. The building was designed to mirror the USS Arizona (BB-39). A variety of sculptures pepper the premises, decorating the air with the chimes of dog tags or the colors of refracted light in honor of those who have served. A bell housed on the