When speaking of the tallest buildings in the world, it is imp
ortant to specify exactly what is being
measured.Listers must decide if the building is to be measured from
sidewalk level or below, whether or
not TV towers or masts are included, and whether an antenna, flagpole, or spire should count.
A building is considered to differ from a tower in its primary use, being designed for residential, business, manufacturing, or mixed use,
whereas
a tower is not.
The Council on Tall Buildings and Urban Habitat, formerly the
Joint Committee on Tall Buildings in conjunction with Emporis Buildings,is
the authoritative source for information about the tallest buildings
in the world, and their list of the tallest buildings, drawn from an
extensive database, is based on the height of the building to the
structural or architectural top, which includes spires and pinnacles,
but does not include antennas, masts, or flagpoles.Prior to
9/11, the twin towers of the
World Trade Center in
New York City, New York were ranked fifth -
1,368 ft (417 m) – and sixth –
1,362 ft (415 m) – on the list of the tallest buildings in the world.
When speaking of the tallest buildings in the world, it is imp
ortant to specify exactly what is being
measured.Listers must decide if the building is to be measured from
sidewalk level or below, whether or
not TV towers or masts are included, and whether an antenna, flagpole, or spire should count.
A building is considered to differ from a tower in its primary use, being designed for residential, business, manufacturing, or mixed use,
whereas
a tower is not.
The Council on Tall Buildings and Urban Habitat, formerly the
Joint Committee on Tall Buildings in conjunction with Emporis Buildings,is
the authoritative source for information about the tallest buildings
in the world, and their list of the tallest buildings, drawn from an
extensive database, is based on the height of the building to the
structural or architectural top, which includes spires and pinnacles,
but does not include antennas, masts, or flagpoles.Prior to
9/11, the twin towers of the
World Trade Center in
New York City, New York were ranked fifth -
1,368 ft (417 m) – and sixth –
1,362 ft (415 m) – on the list of the tallest buildings in the world.
The height is measured from the level of the lowest, significant,
open-air, pedestrian entrance. At the time, the Willis Tower held first
place in the second and third categories, the Petronas Towers held
the first category and the original World Trade Towers held the
fourth. Within months, however, a new antenna mast was placed on the
Willis Tower, giving it hold of the fourth category. On April 20,
2004, Taipei 101 in Taipei, Taiwan, was completed. Its completion gave
it the world record for the first three categories. On July 21, 2007
it was announced that Burj Khalifa had surpassed Taipei 101 in height,
reaching 512 m (1,680 ft).
Since being completed in early
2010, Burj Khalifa leads in all categories (the first building to do
so). With a spire height of 828 m (2,717 ft), Burj Khalifa surpassed
Taipei 101 as the tallest building to architectural detail and the
Willis Tower as the tallest building to tip. It also leads in the
category of highest occupied floor.
Before Burj Khalifa was
completed, Willis Tower led in the fourth category with 527 m (1,729
ft), previously held by the World Trade Center until the extension of
the Chicago tower's western broadcast antenna in 2000, over a year
prior to the World Trade Center's destruction in 2001. Its antenna
mast included, One World Trade Center measured 526 m (1,726 ft). The
World Trade Center became the world's tallest buildings to be
destroyed or demolished; indeed, its site entered the record books
twice on September 11, 2001, in that category, replacing the Singer
Building, which once stood a block from the WTC site.
Structures
such as the CN Tower, the Ostankino Tower and the Oriental Pearl Tower
are excluded from these categories because they are not "habitable
buildings", which are defined as frame structures made with floors and
walls throughout.