A new 102,000-sf outpatient cancer treatment facility in San Diego, Calif., will include space for a one-proton particle beam accelerator cyclotron to treat malignant tumors. Designed and built by a team from Advanced Particle Therapy LLC, Scripps Health, and the Haskell Company, Scripps Proton Therapy Center will feature two fixed-beam rooms and three rotational beam gantries. Each of the five treatment rooms will house electromagnetic beam directional equipment, which weighs 150 tons per piece. Technology is provided by Varian Medical Systems; Signet Development serves as lead developer. Additional space is devoted to offices, clinical diagnostic rooms, and treatment preparation areas.