Merchandise Mart is and Art Deco building finished in 1931. Art Deco's vertical lines emphasize height, and the regular, mechanical patterns glorify industry. The front of the building features busts of the merchant princes of Chicago's history. The massive building has 4.2 million square feet of floor space compared to the 4.8 million square feet in the Sears Tower. Bought by the Joseph Kennedy in the mid 1940s for $13M, and sold by the family in the 1990s for $600M.