New York, New York


Memorial: Michael Arad and Peter Walker and Partners
Entry Pavilion to Museum: Snøhetta
Museum: Davis Brody Bond

Remembering the dead and embracing the living are the twin forces driving the architecture of the National September 11 Memorial & Museum. Although designed by different teams and created for different purposes, the Memorial and the Museum overlap physically and metaphorically. For many people visiting Ground Zero, the two projects will fuse together as a single experience ' a continuum of outdoor and enclosed spaces that elicit a range of emotions and interpretations.

The memorial, designed by Michael Arad and Peter Walker, opens this month on the tenth anniversary of the attacks on the World Trade Center. Based on Arad's entry to the 2003 international competition that drew 5,201 submissions, it forms an 8-acre plaza comprising outdoor rooms shaped by granite, bronze, water, and trees. Arad called his entry 'Reflecting Absence' because it preserves the footprints of the Twin Towers as square holes where water cascades into pools that reflect the Lower Manhattan skyline. 'I imagined a pair of voids cut into the surface of the Hudson River,' says the architect of his original idea. 'Instead of an object, I designed a plaza where people could gather.' He recalls going to Washington Square around 2:00 a.m. a couple of days after the attacks and sharing the park silently with others who had come there. 'I realized the important role that public places play in our civic life,' he says. 'They're the glue that binds us together as a society.'


After the competition jury (which included designer Maya Lin, architect Enrique Norten, landscape architect Michael Van Valkenburgh, and artist Martin Puryear) put Arad's design on a short list of eight finalists, it recommended he team up with a landscape architect. So Arad brought in Walker to collaborate on the project. Responding to criticism that the original scheme was too austere, Arad and Walker integrated more greenery into the plan and used trees to reinforce its geometry. 'We envisioned the trees as points on an abacus,' explains Arad. 'When approached from the east or west, you see the trees in rows. But from the north and south, they appear to be placed randomly, as in a forest.' Walker notes, 'Our challenge was to create a park here yet maintain the strength of the plane.'

Daniel Libeskind's master plan for Ground Zero placed the memorial 30 feet below the streets, so parts of the massive slurry walls surrounding the site could be integrated in the design. Arad, however, brought his memorial plaza to street level, wanting to connect it with the rest of the city. Underneath the plaza, though, he inserted galleries that would look through the cascading water into the voids of the missing Twin Towers and display the names of the 2,982 people who lost their lives in the WTC attacks of 2001 and 1993.

Even after the jury selected 'Reflecting Absence' as the winning design in January 2004, Arad and Walker continued to make changes in response to comments from many different groups. The process wasn't always pretty and often involved heated debate, but Arad says he's proud of the result and feels it retains the integrity of his original design.

The biggest change was eliminating the underground galleries, which he says was painful at first but brought the plaques with the names of the victims up to the plaza level. 'Now we have a more seamless sequence of sidewalk, plaza, names, water, and voids,' says Arad. Other changes came in response to various interest groups, such as the disabled, who said people in wheelchairs would have trouble seeing the voids beyond the bronze panels displaying the names. So Arad chamfered the corners of the panels wrapping the voids and cantilevered them above the walkways so wheelchairs could roll underneath. 'These changes made the design better,' states Arad.

Finding the right trees for the plaza proved to be a complex task, because they needed to grow in a tough urban environment in just 6 feet of soil and create a uniform leaf canopy. The designers ended up selecting white oaks, growing them in New Jersey, then transferring them to the memorial plaza.

Just as the memorial navigated a tortuous process of design and redesign, so did the September 11 Museum. Begun as a cultural facility with two mismatched institutions, the Drawing Center and the International Freedom Center, as tenants, the project morphed in concept and design as those organizations dropped out for different reasons. After winning the competition to design the cultural center in 2005, the Norwegian firm Sn'hetta had to shift gears several times as the program and size of the project changed (and shrank) radically. When Arad was forced to abandon his scheme with galleries tucked around voids, the Lower Manhattan Development Corporation needed to find a new way of bringing visitors underground. So Sn'hetta partner Craig Dykers suggested using his building as an entry pavilion to an underground museum that Davis Brody Bond would design. Although it will occupy some of the space that Arad's galleries would have, the museum will not look into the voids, display the names of the dead, nor have the same connection to the memorial.

While the museum isn't scheduled to open until September 11, 2012, the entry pavilion's exterior is mostly done and provides a sense of scale to the memorial. To help emphasize the horizontal nature of the memorial, Dykers and his team tilted their building up to the east so the plaza seems to slide underneath it. Visitors will enter on the east where the building is widest, go through security, get tickets, and then move downstairs to the museum or upstairs to a small auditorium. A private room on the second floor for family members of 9/11 victims will provide views of the memorial and space for contemplation.

Dykers had originally wanted to clad the building with glass prisms, but that strategy proved too expensive. So his team developed a system of stainless steel panels in which some are perforated and some are opaque. Bead-blasted and scratched finishes help catch the changing daylight while providing blurred reflections of people visiting the site. The architects designed the steel-frame pavilion with angled supports that respond to the different structural demands of the varied infrastructure below it. 'The memorial looks to the past and the skyscrapers to the future,' says Dykers. 'We wanted our building to be about the present, the everyday.'

National September 11 Memorial at the World Trade Center

Design Architect:
Handel Architects — Michael Arad and Gary Handel, partners; Amanda Sachs, David Margolis, Robert Jamieson, Cristóbal Canas, and Garrett Brignoli, project team

Architect of Record:
Davis Brody Bond — Steven Davis, Carl Krebs, David Williams, Joseph Grant, Richard Franklin, project team

Landscape Architect:
PWP Landscape Architecture — Peter Walker, Douglas Findlay, David Walker, Matthew Donham, project team

Entry Pavilion to National September 11 Memorial Museum

Snøhetta — Craig Dykers, partner in charge; Anne Lewison, project manager; Aaron Dorf, project architect

Architect of Record:
Adamson Associates International

National September 11 Memorial Museum

Davis Brody Bond — Steven Davis, Carl Krebs, David Williams, Mark Wagner, Oliver Sippl


National September 11 Memorial at the World Trade Center

Handel Architects.
150 Varick Street, 8th Floor.
New York, NY 10013
tel: 212 595-4112
fax: 212 595-9032

Personnel in architect's firm who should receive special credit:
Handel Architects to complete

Design Architect:
Handel Architects — Michael Arad, partner, Gary Handel, partner; Amanda Sachs, David Margolis, Robert Jamieson, Cristobal Canas, and Garrett Brignoli, project team

Architect of Record:
Davis Brody Bond
Partner in Charge: Steven Davis, FAIA
Managing Partner: Carl Krebs, AIA
Project Director: David Williams, AIA
Project Architect: Joseph Grant, AIA
Project Architect: Richard Franklin, AIA

Landscape Architect:
PWP Landscape Architecture
Peter Walker
Doug Findlay
David Walker
Matthew Donham

(For extended credits on-line for PWP):
Conard Lindgren
Su-Jung Park
David Walker
Michael Dellis
Doris Schenk
Phoebe McCormick Lickwar
Don Shillingburg
Tony Sinkosky
Adam Greenspan

Fountain designer:
DEW Inc.
Dan Euser
Steve Euser

Lighting Designers:
Fisher Marantz Stone
Paul Marantz
Zack Zanolli

Structural Engineers: WSP Cantor Senuik
Project Executive: Silvian Marcus
Project Manager: Yefim Gurevich
Project Engineer: Justin Hahn
MEP Engineers: Jaros Baum Boles
Partner in Charge: Augustinie DiGiacomo
Electrical: Mark Torre
Mechanical: Robert Downward
Plumbing: Jim McGarity
Security Engineers
Waterproofing Engineers
WJE Engineers & Architects P.C.
Douglas Stevie
Jesse Torres
Geotechnical Engineers
Mueser Rutledge Consulting Engineers
Langan Engineering & Environmental Services
Managing Engineer (in Memoriam): John Quinlan
Simpson Gumpertz & Heger Inc.

Blast Hardening Consultant: Weidlinger Consulting Engineers
Commissioning: Horizon Engineers
Sustainability:  Viridian Energy & Environmental LLC
Code Consultants:  Code Consultants Inc.     
Construction Manager:  Lend Lease Inc.

Foundations: EE Cruz & Company Inc.
Steel: Owen Steel Company Inc.
Concrete: Navillus Contracting
Names Parapets: Service Metals Fabricating/ KC Fabrications Inc.
Plaza/Fountain Stone: Port Morris Tile and Marble Corp.
Plumbing: 4J’s Associates LLC
Electrical: Five Star Electric Corp.
Hugh O’Kane Electric Inc.
Waterproofing: KJC Waterproofing Inc.
Landscaping: Kelco Construction Inc.
Names Parapet Mechanical: KSW Mechanical Services Inc.
Fountain Controls: Johnson Controls Inc.
Plaza Metals: Skyline Steel Corp.

National September 11 Memorial Museum Entry Pavilion

Interior designer
Snøhetta Architecture Design Planning P.C.

Buro Happold – Structural, Mechanical, Electrical, Plumbing, Fire Protection, Sustainability
100 Broadway
New York, NY 10005
212 334-2025

Weidlinger Associates Inc. - Blast Engineering
375 Hudson Street
NYC, NY  10014
212 367-3000

Fisher Marantz Stone
22 West 19th Street
New York City 10011
212 691-3020 phone
Arup - Acoustics, Audio Visual
155 Avenue of the Americas
New York
NY 10013
T+1 212 229 2669

Security: Arup
Vertical Transportation: Barker Mohandas, LLC
Graphics and Signage: C&G Partnership, LLC
Fire & Life Safety: Code Consultants, Inc.
Cost Consulting: Davis Langdon
Cladding Consulting: Front Inc.
IT: Shen Milson & Wilke
LEED: Viridian

Construction Manager
Lend Lease

Squared Design Lab
Snøhetta Architecture Design Planning P.C.

CAD system, project management, or other software used:



National September 11 Memorial at the World Trade Center

Structural system
Steel Frame and Concrete
Manufacturer of any structural components unique to this project:
Steel: Owen Steel – Kevin Phillips – 803-251-7565
Concrete: Navillus Construction – Kevin Smith - 718-784-0500

Stone: Port Morris – Anthony Vespa
Fountain Pavers: Roof Block Architectural Pavers
Fountain Sub-Pavers: Carlisle
Metal Fountain Weirs: 4Js Plumbing/Delta Fountains – Mike Russo – 718-961-6634/ Joe Petry – 904-886-9030
Fountain Names Panels: Service Metal Fabricating/KC Fabrications- Joe Moretti -973-625-0694 – Chris Powers – 845-255-0097
Fountain Waterproofing: C.I.M. Industries Inc – Chris Tufano – 800-543-6352
Situra Building Envelopes – Kris Zielonka - 800-474-8872

Stone: Port Morris Tile and Marble Corp.
Plaza Waterproofing: American Hydotech
Plaza Lighting: Selux – Michael Manicone – 845-691-77
Insulation: Dow Corning
Leak Integrity Testing: ILD
Plaza Irrigation: Rain Bird

National September 11 Memorial Museum Entry Pavilion

Structural steel
W&W Steel Erectors, LLC – Structural and Atrium Steel Frame
1730 W. Reno
Oklahoma City, OK 73106

Sorbara Construction Corp. - Structural concrete
270 Broadway
Lynbrook, NY 11563

Exterior cladding
Metal/glass curtain wall:
W&W Glass – GC for Cladding: Metal Panel System, Glass Storefront and Atrium
W & W Glass, LLC
300 Airport Executive Park
Nanuet, NY 10954
845 425 4000

Metal Panel Supplier:
A. Zahner Co. – Stainless steel skin forming & finishing
1400 East 9th St.
Kansas City, MO 64106

Panel Fabrication:
Island Exterior Fabricators – Stainless steel skin cladding assembly and installation
1101 Scott Avenue
Calverton, NY 11922

Glass Supplier:
800 Park Drive
Owatonna, MN 55060
800 533-2080

Storefront Systems:
Erie & Associates Engineering
39555 Orchard Hill Place, Suite 115
Novi, MI 48375

Atrium Glass Framing:
Post Road Iron Works
345 W. Putnam Ave.,
Greenwich, Ct 06830
203 869-6322