Renaissance Center

The Renaissance Center, nicknamed the RenCen, is a group of seven interconnected skyscrapers in Detroit, Michigan, and the tallest building in Michigan since 1977. Located on the Detroit International Riverfront, the entire Renaissance Center complex is owned by General Motors Corporation, as its world headquarters. The central tower, called the Detroit Marriott at the Renaissance Center, is the tallest all-hotel skyscaper in the Western Hemisphere with the largest rooftop restaurant, called Coach Insignia.

John Portman was the principal architect for the original design. The first phase constructed a five-building rosette, with a 73-story hotel surrounded by four 39-story office towers. Portman designed the complex to have "interior spaces." This first phase officially opened in March 1977. Portman's design revolutionized city architecture, constructing the world's tallest skyscaper hotel at the time with the world's largest rooftop restaurant. Two additional 21-story office towers opened in 1981. This type of complex has been termed a 'city within a city' or a 'pseudo city'.

In 2003, General Motors completed a $500 million renovation of the Renaissance Center for its world headquarters which it had purchased in 1996. Source wikipedia

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