Charged with creating three major commercial skyscrapers that will each integrate seamlessly into the overall master plan for the WTC site, a select group of the world's most accomplished architectural and engineering firms has been assembled to form a single WTC Design Team. Each firm has a vital function in the design process.

World Trade Center Properties

A division of Silverstein Properties, Inc. created to oversee the company's rebuilding efforts at the WTC site. Led by Larry Silverstein, the team on 7 WTC.   

Foster + Partners

Foster + Partners, headed by Norman Foster, is the designer for Tower 2 of the WTC site, to be located at 200 Greenwich Street. The tallest of the Greenwich Street towers, this soaring structure topped by a pinnacle of diamond-shaped roofs will be the second-tallest building at the site and in New York, after the Freedom Tower.

Rogers Stirk Harbour + Partners

Rogers Stirk Harbour + Partners is the designer for Tower 3, to be located at 175 Greenwich Street at the WTC site. Headed by U.K. architect Richard Rogers, the firm has designed a 1,155-foot-tower with prominent setbacks and an exposed exterior structural diagrid system.

Maki & Associates

Leading Japanese architectural firm Maki & Associates, founded by Fumihiko Maki, is the designer for Tower 4 of the WTC site, to be located at 150 Greenwich Street. The firm's minimalist-inspired tower is the third of the three WTC towers to be developed by Silverstein Properties.

Adamson Associates

Adamson Associates, a major international architectural firm based in Ontario, Canada, is serving as architect of record for all three Greenwich Street towers. Within the last 25 years, the firm expanded its scope to undertake large-scale projects including the World Financial Center and headquarters for the Hearst Corporation, Bank of America, and Goldman Sachs in New York; Canary Wharf in London; and Kuala Lumpur City Center, 'The World's Tallest Towers' in Malaysia.

WSP Cantor Seinuk

Cantor Seinuk is a globally recognized structural engineering firm based in New York. Having worked on dozens of the largest projects in New York City, the firm's structural engineers join the WTC Design Team as consultants for Towers 2 and 3 of the WTC site. Separately, they are also the structural engineers for the Freedom Tower, the tallest of the planned skyscrapers on the WTC site.


Leslie E. Robertson Associates, the structural engineering firm that designed the original trade center's twin towers, has returned to help rebuild the site by providing structural engineering designs for Tower 4.

Jaros, Baum & Bolles

JB&B, a full-service mechanical and electrical consulting engineer firm, is the mechanical, electrical, and plumbing engineer for the three Greenwich Street towers and 1 WTC.

Israel Berger & Associates, LLC 

Israel Berger & Associates, LLC is the building envelope consultant for Towers 1, 2, 3 and 4. The firm also worked on 7 WTC.   

Tishman Construction

Tishman construction is a private firm that manages complex construction projects for a variety of clients. The company manages Tower 4, Tower 3 and 1 World Trade Center.

DCM Erectors

DCM Erectors, a private firm located in New York, was awarded the contract for the steel structure located in the core and perimeter of Tower 4. The firm specializes in structural steel erection and has been involved in major projects around the city including the New York Times building and Time Warner Center.

Roger & Sons Concrete

Roger & Sons Concrete is a family-owned firm based in Lagrangeville, New York. The company is responsible for the concrete below and above grade in Tower 4.

Yonkers Contracting Company

Yonkers Contracting Company, an established construction company based in New York, provides clients with high quality work on construction projects.

Benson Industries

Benson Industries is the leading company in curtain wall supply and installation and serves several clients worldwide.

The Schindler Group

The Schindler Group was founded in Switzerland and is a well known supplier of elevators and escalators systems for several types of infrastructure worldwide. The company will provide Tower 4 with both elevators and escalators.

Studio Daniel Libeskind

Selected in 2003, Daniel Libeskind is the master planner for the WTC site.  In addition to a towering spire of 1776 feet, his plan proposed a complex program which called for the construction of a contemplative memorial with waterfalls, an underground museum, a visitor center, retail space, a huge train station and a spiraling set of four office towers arranged around the site. By re-introducing the Manhattan streets through the site, the Libeskind plan reconnects the World Trade Center to the City's grid. For more than 8 years, Studio Daniel Libeskind has been coordinating with the Port Authority of New York and New Jersey, the Lower Manhattan Development Corporation, Silverstein Properties and each architect to realize the Master Plan.