The Rookery

The Rookery is a building that contains two of the greatest achievements in Chicago architecture — and most people who work in it don't know about either. The exterior, designed by Daniel Burnham and John Wellborn Root in 1888, is a Romanesque masterwork in red granite and brick that was the tallest building in Chicago when completed. But the real treasure is the light court — a soaring two-story atrium with a glass skylight that Frank Lloyd Wright redesigned in 1905, adding white marble, gold-leaf ornamentation, and geometric light fixtures that transformed Root's Victorian original into something luminous and modern.

The building's name comes from the temporary city hall that stood on this site after the Great Fire of 1871, which attracted so many pigeons that locals called it 'the rookery.' When Burnham and Root built their office block here, the name stuck. The structural innovation hidden behind the ornate exterior was Root's use of a floating foundation — concrete and steel rails spread across the soft Chicago clay — which solved the engineering problem that made tall buildings on Chicago's marshy lakefront soil seem impossible.

Wright's lobby renovation is the jewel. The staircase with its ornamental ironwork, the marble wainscoting, the interplay of natural light through the skylight and the geometric patterns Wright imposed on Root's original design — it's one of the few places where you can see two of Chicago's architectural titans in dialogue across two decades. The building is open during business hours, and the lobby is free to visit. Most tourists don't know it exists, which makes it one of the best architecture experiences in the city.