Original Building (1950). Erb Memorial Union. Architect: Lawrence & Lawrence. Design work began in Jan. 1945 on the long-desired student union. Plans were initially developed by H. Abbott Lawrence, son of Ellis. F. Lawrence, who briefly held the partnership Lawrence and Lawrence until Ellis Lawrence's death in 1946. Design work ended by Aug. 1948. Early concepts included a high-rise hotel. Construction began in Oct. 1948 and ended in 1950. Planned for 25 years, Lawrence, Tucker & Wallman revised the plans after Lawrence's death. The building was named for Donald Erb, UO war-time president, who died in office in December, 1943, at age 43. It also commemorated members of the UO community and graduates who served during the war.

Southeast Addition (1962).

East Addition (1973; demolished 2014). Architect: Coburn and Sheldon, Lutes and Amundsen. As described in Style & Vernacular (below): "The quiet elegance of the original building is a good foil to the exuberant addition with its skylighted, promenade ramp and lively detailing...The diagonal path under the building forms a gateway linking the active central campus with the interior residence lawns to the south and east."

Interior Renovation (Fishbowl) (1980)

Ballroom Area Alterations (1986)

Amphitheater & Food Services Renovation (1998). Landscape Architect: Cameron McCarthy Gilbert & Scheibe. Project Planner: Fred Tepfer. Manager: Garry Fritz. Initiated by ASUO to commemorate that organization's 100th anniversary, this project created an amphitheater and stage. Its design involved strong involvement with user groups of students, faculty, and staff. The 'free speech plaza' was long envisioned as part of the EMU's features and this project restored that concept which alterations after the 1950 original design impeded.