Completed in 1939, the SC Johnson Administration Building was the largest commercial project designed by Frank Lloyd Wright. The Great Workroom of the building features 43 miles of Pyrex glass tubing, and the ceiling is supported by large golf-tee shaped columns that have been termed one of the most advanced structural supports in modern architecture. The adjacent 15-story Research Tower opened in 1950 and became the birthplace for several of SC Johnson's most trusted brands, including Raid, Glade, OFF!, and Pledge. The Research Tower is an example of cantilever construction with an inner core extending 50 feet into the ground that provide support for the 16 million pound structure.