Related terms:
john hancock center
highest occupied floor
tallest building in chicago
willis group holdings
freestanding structure
shanghai world financial center
tallest buildings in the world
willis tower
structural system
pinnacle height
tall buildings
supertall
chicago board of trade
design and construction
petronas twin towers
roebuck
cn tower
petronas
burj dubai
surpassed
tallest building
skyscraper
Wikipedia sources:
Willis Tower
Fazlur Khan
Sears
Chicago Board of Trade Building
Chicago
List of tallest buildings and structures in the world
Skyscraper
1970s
List of tallest buildings in Chicago
Context for words:
sears
tower
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