The wonderfully designed semi-circular staircase at the Rookery Building, a historic landmark located in the Loop community area of Chicago in Cook County, Illinois, United States. Completed by John Wellborn Root and Daniel Burnham of Burnham and Root in 1888, it is considered one of their masterpiece buildings. It once housed the office of the famous architects. It measures 181 feet (55 m), is twelve stories tall and is considered the oldest standing high-rise in Chicago. It has a unique style with exterior load-bearing walls and an interior steel frame. The lobby was remodeled in 1905 by Frank Lloyd Wright. Starting in 1989, the lobby was again restored to the original Wright design..The Rookery was built in 1887-1888 in the architectural boom that followed the Great Chicago Fire, architects in what would become known as the Chicago School of commercial architecture competed with each other to create the world's first true skyscrapers. By mixing modern building techniques, such as metal framing, fireproofing, elevators and plate glass, together with traditional ones, such as brick facades and elaborate ornamentation, Burnham and Root sought to create a bold architectural statement. At the same time, they intended their buildings to be commercially successful. This building is one of the few results of their partnership that is still standing.. As the master artisan, Root drew upon a variety of influences in designing the interior and exterior spaces, including Moorish, Byzantine, Venetian and Romanesque motifs. He also provided the architectural innovations that brought together many contemporary cutting edge building techniques. Of particular note was a "floating" foundation--a reinforced concrete slab that provided the building's weight with a solid platform atop Chicago's notoriously swampy soil. The term for the type of foundation that Root designed is grillage foundation, a foundation where iron rails and the structural beams are combined in a crisscross patt
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