The Willis (formerly Sears) Tower in Chicago, with its signature black aluminum and bronze-tinted glare-reducing glass, was the tallest building in the world for nearly 25 years. Designed and completed in 1974, Willis Tower set the standard for supertall skyscrapers around the globe, both in its innovative design and graceful styling. With 416,000 square meters of space, the building is comparatively large for its height, with its foundation and the first 50 floors taking up an entire city block before the building begins to narrow.