 The Rand-McNally Building that had served as the headquarters of the World's Columbian Exposition was demolished to accommodate the structure.The Federal Reserve Bank of Chicago, at 230 South LaSalle Street, was built in a Greco-Roman style and contained the largest vaults in the world and one of the first building-wide wired communication systems.Both the Federal Reserve Bank and 208 South LaSalle demonstrate the popularity of neoclassical architecture during the late 19th and early 20th centuries and were meant to project a sense of financial security.