 The unbuilt second-place entry in the competition, a more simplified stepped-back design by Eliel Saarinen, also proved highly influential.The popularity of the older style then began to wane in favor of a greater emphasis on towers.One common way of building these within Chicago's laws was to build a square main block with a central service core, and then simply place a tower on the top; the more massive the main block, the taller the tower could be.