The Jewel of "The Mile" The gleaming white Wrigley Building is one of America’s most famous office towers. Located on Michigan Avenue on the north bank of the Chicago River, at the southern most point of Chicago's Magnificent Mile, the Wrigley Building consists of two sections connected by an open walkway at street level and two enclosed walkways. The architectural shape of the Wrigley Building is patterned after the Seville Cathedral’s Giralda Tower in Spain. However, the ornamental design of the building is based on an American adaptation of French Renaissance style. Mr. Charles Beersman, chief designer for the building’s architects, Graham, Anderson, Probst and White, used his talent and imagination to combine the two concepts. On July 4th weekend, the building was festooned with a gigantic American flag.