The Rookery: Evolving Standards of Architecture in Chicago March 23, 2017 By Matt Baker of "Sustainable Chicago" It’s tempting to assume that a landmarked building like the Rookery has been preserved in architectural amber. But the world-renowned structure isn’t exactly the one that Daniel Burnham and John Root designed in the 1880s. After the turn of the century, Frank Lloyd Wright famously applied a gilded eggshell cladding to the lobby. In the 1930s, William Drummond, formerly a Wright protégé, added Art Deco elements, including bronze elevators etched with birds matching the building’s moniker. The twelfth story was largely rebuilt in the 1990s when Burnham & Root’s original office was restored.