The Rookery Building is a historic office building located at 209 South LaSalle Street in the Chicago Loop. Completed by architects Daniel Burnham and John Wellborn Root of Burnham and Root in 1888, it is considered one of their masterpiece buildings, and was once the location of their offices. The building is in height, twelve stories tall, and is considered the oldest standing high-rise in Chicago. It has a unique construction style featuring exterior load-bearing walls and an interior steel frame, providing a transition between accepted and new building techniques. The lobby was remodeled in 1905 by Frank Lloyd Wright. From 1989 to 1992, the lobby was restored to Wright's design.