What happened in the 1970s?
🏙️ Urban Development: The completion of Sears Tower in Chicago, world's tallest building at the time (1973)
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Further Reading
Willis Tower - Wikipedia (wikipedia.org)
About Willis Tower (willistower.com)
Buildings that elevated cities: Chicago's Sears Tower - MODUS | RICS (rics.org)
The Willis Tower Formerly The Sears Tower - Chicago Autohaus (chicagoautohaus.com)
Why Doesn't the Willis Tower Topple Over? - Facebook (facebook.com)
Willis Tower History | Skydeck Chicago History and Story (theskydeck.com)
Top 10 Tallest Buildings In Chicago (bestdiplomats.org)
BUILDING BIG: Databank: Sears Tower - PBS (pbs.org)
Sears Tower: The Name Says It All (searstower.org)