USA The New World Trade Center in New York.

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USA The New World Trade Center in New York.

Soaring above the city at 1,776 feet, One World Trade Center will be America's tallest building - and an indelible New York landmark. Designed by David M. Childs of Skidmore, Owings & Merrill, the 2.6-million-square-foot building will include office space, an observation deck, world-class restaurants, and broadcast and antennae facilities.

Begun by Silverstein Properties in April 2006 and taken over by the Port Authority of New York and New Jersey, construction has accelerated in the last year.   

An expansive public lobby will be topped by a series of mechanical floors, comprising the base level of 1WTC.  Above this base will be sixty-nine office floors, including two television broadcast floors, mechanical floors, and two restaurants. Atop this, there will be an observation deck and a glass-metal parapet. The crown of the project is a communications platform and a 408-foot, cable-stayed antenna, designed in collaboration with artist Kenneth Snelson.  

Sustainable design is central to One WTC's development, integrating renewable energy, interior daylighting, reuse of rainwater, and recycled construction debris and materials. The below-grade concourses will include approximately 55,000 square feet of retail space and connect to an extensive transportation network.  

One WTC will incorporate advanced life-safety systems that exceed New York City building code requirements. From structural redundancy to dense fireproofing to biochemical filters, it will create a new standard for high-rise buildings. Extra-wide pressurized stairs, multiple backups on emergency lighting, and concrete protection for all sprinklers will ensure optimal firefighter access. Exits are designed to ensure easy evacuation, and all safety systems will be encased in the core wall, with the enhanced elevators.  

Safe, sustainable, artistically dynamic - One WTC will stand as a shining beacon for New York's transformed Downtown.    

The second tallest of the WTC towers, 2 World trade Center (200 Greenwich Street) will create a bold addition to the New York skyline. Designed by Foster and Partners, its sparkling glazed crystalline with a diamond-shaped summit will salute the memorial below, 

  At 1,349 feet, 2 WTC tower will contain five levels of retail; four trading floors; 60 office floors -- a of total 3.1 million rentable square feet; and a 67-foot-high office lobby. Its eight entrances will allow access at street level, below-grade at the WTC Transportation Hub, and at the retail area. A typical office area will vary in size from 41,000 to 45,000 rentable square feet of space. Trading floors will be 65,000 square feet.  

2 WTC's central cruciform core - steel encased in reinforced concrete - will provide the structural backbone to the tower. Its safety systems will exceed New York City building code and Port Authority of New York and New Jersey requirements, and  it will seek to to achieve the LEED Gold standard for energy efficiency.  

 2 World Trade Center will be a powerful statement of hope as we look to the future. Its height celebrates the spirit of the city and the diamond shape top will be a crowning landmark in Manhattan.s new skyline  .

3 World Trade Center - Greenwich Street View.

3 World Trade Center is a bold design by Pritzker Prize winning architect Richard Rogers. Rising eighty stories, 3WTC will include 2.8 million square feet of office space spread across 53 floors and five trading floors.  Office levels will range from 29,000 to 44,000 square feet, and trading floors will include 68,000 square feet of space  3WTC will have five levels of retail at and below grade.

The tower will consist of a reinforced concrete core with steel structure outside the core, and be clad in an external structural steel frame. Its safety systems will exceed New York City building code and Port Authority of New York and New Jersey requirements, and  it will seek to achieve the LEED Gold standard for energy efficiency.      

4 World Trade Center at 150 Greenwich Street will face directly onto the World Trade Center (WTC) Memorial Park from the west. Rising 977 feet from street level, it will be the fourth-tallest skyscraper on the WTC site. Designed by Maki and Associates, the 72-story tower is intended to assume a quiet but dignified presence at the site while also serving to enliven the immediate urban environment as part of the redevelopment efforts of downtown New York.

The podium of 4 WTC consists of two retail levels below grade, ground floor, and three levels above grade. The remaining floors are set aside for commercial offices, totaling 2.3 million rentable square feet. One third of the office space is slated to become the new headquarters of the Port Authority of New York and New Jersey.

The tower portion of the building will accommodate office spaces in two distinctly shaped floor plates. The lower- and mid-rise sections, floors 7 through 46, will feature a typical floor plate size of 44,000 rentable square feet in the shape of a parallelogram echoing the configuration of the site. These floors will be served by two elevator banks, each equipped with eight cars and one elevator bank with six cars. The high-rise section of the tower, from floors 48 to 63, will feature a trapezoidal floor plate measuring 34,000 rentable square feet. The trapezoid will be shaped and fluted to open toward the tip of Manhattan and triangulated from the lower floors to face 1 World Trade Center. These floors will be served by two elevator banks, each with six cars. Both office floor plans contain a central core with a 45-foot span on the west side facing the memorial, as well as on the north and south. The east side has a 35-foot lease span. The project will also provide access to Wall Street and the central PATH terminal.

Building Systems

The building will feature many structural enhancements, including a reinforced concrete core and columns with steel girders and beams. Safety systems will be designed to exceed New York City building code and Port Authority of New York and New Jersey requirements. Designed in accordance with the highest energy efficiency standards, 150 Greenwich Street will seek to achieve the Gold standard under the Leadership in Energy and Environmental Design (LEED) by the U.S. Green Building Council.

Located on the southernmost portion of the World Trade Center (WTC) site, 5 World Trade Center will be developed by the Port Authority of New York and New Jersey.  In September 2006, as part of the Master Redevelopment Agreement for the World Trade Center site, the Port Authority assumed responsibility for construction of this tower.

Designed by the architectural firm of Kohn Pederson Fox, it will stand on the site currently occupied by the remains of the Deutsche Bank building, which was irreparably damaged by the terrorist attacks of September 11, 2001. The 40-story building's decontamination process began in early 2006, when crews from Bovis Lend Lease erected scaffolding and elevator hoists and installed new netting around the exterior. Interior abatement followed, and included environmental cleaning and removal of all interior surfaces and non-structural elements in the building.

The actual floor-by-floor deconstruction commenced in March 2007, but was suspended after a fire on August 18, 2007 that damaged floors 13 through 18. At the time, the building had been deconstructed to the 26th floor; the search for potential human remains in the building concluded in early June 2007.

The tower was deemed structurally sound immediately after the fire, and soon the project managers instituted several safety improvements. They included repairing the fire standpipe, using fire-resistant materials and equipment, rebuilding safety structures, centralizing the negative-air-pressure and electric controls, and improving emergency access and egress points.

The city’s stop-work order was lifted at 130 Liberty Street in April 2008, and decontamination resumed in May 2008 with constant fire department and environmental oversight and monitoring. Crews wrapped up abatement in September 2009, with deconstruction resumed in November 2009. 

7 World Trade Center (WTC) marks the gateway to the new WTC and heralds the spirit of redevelopment and renewal in downtown Manhattan. Opened in May 2006, the rebuilt 52-story, 1.7-million-square-foot office tower is now fully leased, with a tenant directory that includes  Moody's Corporation, WestLB, New York Academy of Sciences, Wilmer Hale, Ameriprise Financial, BMI, Silverstein Properties, and Mansueto Ventures, publisher of Fast Company and Inc. magazines. The building is developed, owned, and managed by Silverstein Properties.

Located at 250 Greenwich Street and bound by Greenwich, Vesey, Washington, and Barclay Streets, the 741-foot-tall structure contains 42 column-free, tenant floors, each averaging 40,000 square feet and starting on the 10th floor. The lower floors of 7 WTC are dedicated to building mechanical facilities and a Con Edison substation that supplies electrical service to downtown Manhattan.

Sustainable Design

Sustainable design is among the most important initiatives at 7 WTC. The U.S. Green Building Council, which has developed the nation's only common standard of measurement for a "green" building, certified the tower at gold status for core and shell development under its Leadership in Energy and Environmental Design (LEED)-rating system, making it the first green commercial office building in New York City.

Artistic Collaboration

Artist and MacArthur Fellow James Carpenter worked with David Childs and the SOM team to design the exterior podium wall and its lighting. Inside, the building lobby features a site-specific installation by acclaimed conceptual artist Jenny Holzer. The work is an animated-text installation of prose and poetry that scrolls across a glowing 65-foot-wide, 14-foot-high glass wall behind the reception desk.

Public Space

The triangular park at 7 WTC, situated between the now-extended Greenwich Street and West Broadway, creates public open space and provides light and views in a previously congested area. The park, designed by landscape architect Ken Smith, consists of a central open plaza with a fountain and flanking groves of trees and shrubs. At the center of the park, solid marble benches surround a 30-foot-wide fountain with jets of water. Featured in the fountain area is a sculpture by renowned artist Jeff Koons, Balloon Flower (Red).

Construction System

Among its many building enhancements, 7 WTC has a reinforced concrete core and a steel superstructure. Safety systems exceed New York City building code and Port Authority of New York and New Jersey requirements and are expected to form the basis for future high-rise building codes. Tishman Construction Corporation served as construction manager for 7 WTC.

Source: wtc