General Motors Corp acquired its headquarter building at the Renaissance Center, which consists of office towers 100, 200, 300 and 400 in Detroit, from Riverfront Holdings Inc. for $626 million, or about $277.50 per square foot. The four office buildings total 2.26 million square feet. The buildings are known as Phase I and make up the Renaissance Center, which is along the Detroit River. GM bought the property due to the current real estate market conditions.