Southfield is a city in Oakland County of the U.S. state of Michigan. It is a northern suburb of Detroit, MI. As of the 2010 census, the city had a population of 71,739. A part of Metro Detroit's upscale office market, the city's marque is a cluster of five golden skyscrapers ? known as the "Golden Triangle" ? that form the contemporary 2,200,000 square feet Southfield Town Center office complex with a Westin Hotel and a conference center. In addition, a 33-story luxury residential high-rise is separate from the complex. To the west, near the confluence of I-696/Reuther Freeway and M-10/Lodge Freeway, is the American Center.