TIME TO BUILD: 14 years from the formal proposal to finish
NUMBER OF ARCHITECTURAL DEIGNS: 105
COST TO BUILD: More than $1 billion
RENTABLE FLOOR SPACE: About one acre per floor
DEPTH OF THE TWIN TOWERS: 70 feet
EXTRA LAND CREATED BY BUILDING THE WTC: About 23 acres added to Lower Manhattan
TWIN TOWERS ELEVATOR SPEED: 1,600 feet per minute
WINDSPEED THE TOWERS COULD SUSTAIN: 80 m.p.h.
NUMBER OF SPRINKLERS IN THE TOWERS: 3,700
HEIGHT OF THETIGHTROPE WALK BETWEEN THE TOWERS: 1,350 feet on August 7, 1974
FORCE OF THE TREMOR WHEN THE TOWERS FELL: Akin to 2.1 and 2.3 earthquakes
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