When architects HLW International began a $40 million renovation of the Old Nassau County Courthouse, a neoclassical edifice with a decaying structure and outdated interiors, they turned to structural steel to restore the historic principles of the initial design while adapting to the present-day requirements of the county.

From a distance, One Northside Piers, a new luxury condo tower on the Williamsburg waterfront, might look a lot like other residential towers, but a closer look reveals a complex window wall system designed by FXFowle Architects.

When nonprofit organization Friends of the High Line saved the massive West Side elevated railroad from threatened demolition, it chose Diller Scofidio + Renfro to transform the track into a one-of-a-kind elevated park.

One Bryant Park is not only a symbol of LEED excellence, but also of the highest standards in engineering and technology. The intertwining of skyscraper and nature led to this building, an homage that begins in its dramatic lobby.

One of New York City's first attempts to arrange big-box retail into a vertical format, Rego Park II occupies the equivalent of three to four Manhattan blocks with three floors of retail space, a residential tower, and a five-level car garage.

Allied Works Architecture's reinvention of Edward Durrell Stone's 2 Columbus Circle, creates a new home for the Museum of Arts and Design that more than doubled the new owner's gallery space.

One of the final pieces in the Times Square redevelopment project, Eleven Times Square will add 1.1 million square feet of office space to the 24-hour environment in which business and entertainment converge.

Cooper Square, the bowtie of streets at the throat of the bowery, is transforming into an intersection of important contemporary architecture that now includes The Cooper Square hotel designed by Carlos Zapata Studio.

The Jacob K. Javits Federal Building in Manhattan’s Civic Plaza is home to 20 federal agencies, including the Immigration and Naturalization Service, which receives more than 1,000 visitors each day. To solve the problem of long lines outside the building, the result of the security screening process implemented in 1995, the General Services Administration hired architecture firm Lehman-Smith + McLeish and structural engineering firm Weidlinger to design a new pavilion on the building’s Broadway side. Wanting to maintain the open, glassy aspect of the original 1967 Kahn & Jacobs-designed lobby, the team framed the pavilion in structural steel to create a light-filled, lightweight structure that could be supported by an existing underground garage. Location: 26 Federal Plaza New York, NY Owner: General Services Administration, Public Building Services New York, NY Architect: Lehman-Smith + McLeish PLLC Washington, DC Structural Engineer: Weidlinger Associates New York, NY Mechanical Engineer: WSP Flack + Kurtz New York, NY General Contractor: Volmar Construction, Inc. Brooklyn, NY Curtain Wall Consultant: Advance Structures Inc. New York, NY Structural Steel Erector: Global Iron Works New York, NY Miscellaneous Iron Fabricator and Erector: Global Iron Works The Bronx, NY Architectural Metal Fabricator and Erector: Action Bullet Resistant Inc. West Islip, NY Ornamental Metal Fabricator and Erector: Global Iron Works The Bronx, NY Curtain Wall Fabricator: United States Aluminum Waxahachie, TX Curtain Wall Erector: Action Bullet Resistant Inc. West Islip, NY Metal Deck Erector: Integrated Construction Inc. Hicksville, NY

When Bank of America commissioned Gensler to design a staircase uniting its trading floors at One Bryant Park, the architects knew that the design would represent the bank's brand in addition to streamlining the flow of traffic between trading rooms.

When designing the Riverhouse condo project in Battery Park City, Polshek Partnership Architects had two main goals: maximize views of the Hudson River for occupants, and design the first LEED Platinum-rated building in New York City.

A new glass pavilion shelters stairs and escalators to an under-ground passage and an elevated station, creating a day-lit connection between the transit hub and the surrounding neighborhood.

Though early egg shaped digester (ESD) facilities were constructed of concrete, the Department of Environmental Protection's decision to use steel as the primary material throughout the Newtown Creek Wastewater Treatment Facility.

To foster a collaborative environment at Albert Einstein College of Medicine’s Michael F. Price Center for Genetic and Translational Medicine, Payette designed a dramatic steel spiral staircase that resembles the form of a double helix.

In planning and constructing Tribeca condo project One York for developer Stanley Perelman, TEN Arquitectos used the properties of structural steel to make the most of an extraordinarily difficult site.