The Westin Bonaventure Hotel and Suites is a 367-foot (112 m), 33-story hotel in Los Angeles, California, constructed between 1974 and 1976. It was designed by architect John C. Portman Jr.. The top floor has a revolving restaurant and bar. It was originally owned by investors that included a subsidiary of Japanese conglomerate Mitsubishi Corporation and John Portman & Associates. The building is managed by Aimbridge Hospitality (IHR), and is valued at $200 million.

John Calvin Portman Jr. was an American neofuturistic architect and real estate developer widely known for popularizing hotels and office buildings with multi-storied interior atria. Portman also had a particularly large impact on the cityscape of his hometown of Atlanta, with the Peachtree Center complex serving as downtown's business and tourism anchor from the 1970s onward. The Peachtree Center area includes Portman-designed Hyatt, Westin, and Marriott hotels. Portman's plans typically deal with primitives in the forms of symmetrical squares and circles.