Though we're getting taller all the time, skyscraper development in Austin really boomed during the 1980s. Between 1980 and 1987, 12 buildings with 15 or more floors opened in the downtown area, including the cluster of earth-toned towers -- One American Center, One Eleven Congress, 100 Congress, 301 Congress, and San Jacinto Center -- that defined the "Old Austin" skyline for nearly 20 years until the Frost Bank Tower arrived on the scene in 2004.  . . .