The Ledge at Willis Tower, formerly Sears Tower, was created to enhance a classic SOM building with an innovative addition that is in the spirit of the original design. The minimal five-sided glass balconies allow for views in all directions and provide an experience that approximates being suspended in the air. The ledges are approximately 4 feet deep, 10 feet high, and 10 feet wide. They are made of 1.5 inch laminated glass panels hung from a steel frame that rides on rails, allowing it to be retracted into the building for cleaning and maintenance. A multi-disciplinary team at SOM conceived the design, created construction documents for the fixed elements, and worked closely with the design/builder of the movable glass ledges. This unique concept is showing promise as a feature in new towers currently being designed by the firm.