Core B
73
floors, 251 meters tall.
Started pouring concrete February 11, 2000
Core C
66 floors, 229 meters tall.
Started pouring concrete March 21, 2000.
Both cores slipformed simultaneously at a
rate of 1 floor every 2 days. Both cores "topped
out" November 2000.
Erection of surrounding steel structure
and pouring of concrete slabs carried out 10 floors below slipform.
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