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In front of the building, on the WTC compound plaza level, stood
Alexander Calder's 8-meter steel sculpture Three Red Wings as well as
pedestrian bridges over Vesey Street from the WTC compound, with a
round plexiglass tube covering the eastern one. |
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The building collapsed during the terrorist attack on the WTC in
September 2001, having been structurally weakened by the destruction of
the nearby WTC towers. |
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Although not small by any standards -- built on Port Authority land, it
was exempt from zoning regulations and could occupy the whole
trapezoidal plot with no setbacks -- the building's floor space and
height of 160 m were obviously dwarfed by its older twin brothers |
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As the existing foundations through the substation building were mostly
not aligned with the perimeter colonnade of the new tower, they had to
be fitted with concrete caps to allow transfer of loads to the
foundations. |
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For the core, the loads were transferred through a heavily braced
foundation slab. 50 new foundation "caissons" were built, most of which
had to be squeezed through the substation building. |
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The building's appearance and its alternating facing -- horizontal
glass striping on the Barclay and Vesey Street sides and red granite,
holed by smaller windows, on the other two -- set it apart also
visually from the Twin Towers of the late 1960s. |
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Although a part of the WTC in name, the building was on a separate
ground lease and tax lot from the rest of the Center. 7 WTC was built
atop the power substation building that supplied much of Downtown
Manhattan with electricity. |
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The new ![under construction [topped out]](emporis_wtc7_files/green-blue.gif) Seven World Trade Center is already under construction. |
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A federal report concluded that the building collapsed because the
debris from the other WTC towers ignited the diesel fuel lines running
in the base of the building, triggering the collapse. |
