Greystone Mansion, 905 Loma Vista Drive, Beverly Hills. This 55-room, 46,000-square-foot Tudor mansion was built in 1928 for Edward L. (Ned) Doheny, son of the first man to strike it rich in Los Angeles oil. The estate once occupied 415 acres. In 1965, Beverly Hills bought the mansion and 19 surrounding acres. The house is not open to the public, but the park affords spectacular views and visitors can stroll through three gardens.