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.
The 425-foot (130 m) south tower was completed in April 1921 and the north tower in May 1924.