Besides the Town Center skyscrapers, Southfield's modern towers include the 26-story American Center (1975) by the SmithGroup and One Towne Square (1992) by Rossetti with 21-stories. Other notable centers of commerce in the area are Dearborn, Troy, and Auburn Hills. Dearborn contains the world headquarters of the Ford Motor Company. Dearborn's 14-story luxury Adoba Hotel (1976) with its contemporary arced design by Charles Luckman is among the region's conference centers, with 772 rooms. Rossetti designed Dearborn's modern Ritz-Carlton Hotel (1988) along with the complementary Fairlane Plaza North and South (1990) as well as the Parklane Towers (1973). Troy has a large number of office buildings, many of which are situated along the corridor of Big Beaver Road. The tallest of these is the Top of Troy (1975) building, a 27-story triangular tower. Troy also contains what is generally considered to be the most upscale shopping center in the region, the Somerset Collection.