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11/13/2013

One World Trade Center Officially U.S.’s Tallest Building

 
One World Trade Center beats out Willis Tower for tallest building in the U.S.

Chicago’s Willis Tower can no longer lay claim to being the tallest building in the U.S.

The Council on Tall Buildings and Urban Habitat convened its Height Committee to rule on the official height of One World Trade Center (1WTC) in New York. The committee reached a consensus that the New York building’s height to its architectural top is 1,776 feet.

The two issues regarding the true height of the building were:

  • The nature of the mast structure on top of the tower.
  • The datum line (bottom point) from which the height to architectural top was determined.

Due to design changes that resulted in the removal of the architectural cladding around the mast at the top of the structure, it became unclear whether the structure was in fact a “spire” – a vertical element that completes the architectural expression of the building and is intended as permanent, or whether it was an antenna – a piece of functional-technical equipment that was subject to change.

The spire-antenna distinction makes a difference in the measurement of “height to architectural top,” which includes spires but does not include antennae, signage, flag poles or other functional-technical equipment. Determining the topmost structure to be “functional-technical” potentially could have significantly impacted 1WTC’s ranking against other buildings, as the next obvious point to take a measurement of “architectural top” would have been the building’s roof slab, at 1,334 feet, 8 inches – 441 feet, 4 inches lower than claimed.

“We were very satisfied with the detailed information presented by the team, in particular, that which affirmed that the structure on top of the building is meant as a permanent architectural feature, not a piece of functional-technical equipment,” said Timothy Johnson, Chairman of CTBUH and Design Partner at NBBJ.

The second issue at 1WTC was the location from which the 1,776-foot measurement had been taken. The building has four entrances, one on each side. Three of those entrances are flush with the 9/11 Memorial Plaza, which is level with the base of the original World Trade Center towers. These three entrances lead directly into the elevator lobby, while a fourth entrance is 5 feet, 8 inches lower than the lobby, on Vesey Street, due to the change in grade from south to north. If measured from this point, the height to architectural top would have been 1,781 feet, 8 inches.

A presenter showed plans indicating that the main entrance of the building was the south entrance facing the 9/11 Memorial plaza, and that the north entrance at the lower elevation does not provide direct access to the elevators, but requires negotiating steps or using a disabled-access lift to ascend to the lobby. To be considered “significant,” an entrance must “be predominantly above existing or pre-existing grade and permit access to one or more primary uses in the building via elevators.” Therefore, the lower Vesey Street (north) entrance was not considered “significant” by the committee.


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Upon completion, the building is expected to be the world’s third tallest building.

 


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Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Add highly responsive multi-zone comfort to any building project, in any climate. Our CITY MULTI H2i R2- and Y-Series VRF systems give you flexibility to fit the needs of any building. Enjoy 100% heating capacity at 0°F outdoor ambient, and 85% heating capacity at -13°F outdoor ambient.  For more information, log on to www.mitsubishipro.com

 
12/17/2014

Tests show geothermal could cut costs up to 44%.

12/16/2014

New provisions added before end of session.

12/15/2014

Ultraviolet regimen can reduce incidence of dangerous viruses up to 20%.

12/12/2014

New design keeps heat from entering buildings.

12/11/2014

Provision covers new construction and retrofits.

12/10/2014

New rule will cut consumption by 15-20%.

12/09/2014

Recent rainfall not enough to offset groundwater losses.

12/08/2014

New technology allows record-high energy output.

12/05/2014

New “heat mirror” could revolutionize facility cooling.

12/04/2014

Education improves efficiency and employee happiness.

12/03/2014

Interactive building guide provides directions.

12/02/2014

Study shows walking at work can improve focus, mental health.

12/01/2014

Ruling would further limit smog emissions.

11/26/2014

Survey shows green initiatives pay off in hiring as well as energy.

11/25/2014

More executives choosing alternatives to LEED.

11/24/2014

EPA challenge to increase diversion rates for the holidays.

11/21/2014

Framework allows users a better look at roofing's environmental impact.

11/20/2014

Study finds paper towel dispensers carry far fewer germs.

11/19/2014

Tool will help manage information during power outages.

11/18/2014

Requirements include energy, IEQ, and sustainability updates.

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