In an industry where time is often of the essence, sticking to a strict construction schedule is common-sense – and often hard to do. For the Renaissance Towers, a slack schedule was simply not allowed. The aggressive schedule employed a hybrid curtain wall system which allowed for the prefabrication of nearly 94-stories of cladding off-site as well as two separate sub-contractor teams to finish both towers in less than 10 months – a ramped up construction schedule fit for a new dawn in development. Developer: Cappelli Enterprise Inc. Valhalla, NY Architect: Costas Kondylis and Partners LLC New York, NY Structural Engineers: Rosenwasser Grossman P.C. New York, NY; Tadjer-Cohen-Edelson Assocites, Inc. Silver Spring, MD Mechanical Engineers: Ace Engineering, P.C. Westchester, NY General Contractor: George A. Fuller Co. Valhalla, NY Curtain Wall Consultant: Gordan H. Smith Corp. New York, NY Curtain Wall Fabricator: Sota Glazing, Inc. Brampton, Ontario, CA Curtain Wall Erector: W&W Glass Systems, Inc. Nanuet, NY; King Glass, Extexer, PA

A steel frame provides strength, security, and stability – all the elements which the planned Citigroup LIC2 were lacking. Conceived as a two-phase project, the second phase adding a possible 36 stories atop the first phase structure, work on the development stopped due to national security concerns. Once resumed, the architects faced the challenge of building phase one with only the possibility of phase two. The structure, the team knew, had to be strong and flexible enough to support the second phase while allowing the first phase to be built according to plan – a job only steel could perform. Owner: Citigroup New York, NY Developer: Tishman Speyer New York, NY Architect: Kohn Pederson Fox New York, NY Structural Engineer: WSP Cantor Seinuk New York, NY Mechanical Engineer: Cosentini New York, NY General Contractor: Turner Construction New York, NY Structural Steel Fabricators: Owen Steel Columbia, SC Structural Steel Erectors: AJ McNulty & Co. Inc. Maspeth, NY Miscellaneous Steel Fabricators and Erectors: Kraman Iron Works, Inc. New York, NY; FMB Harrison, NJ Architectural Metal Fabricators and Erectors: American Architectural Bensalem, PA; Allied Bronze LLC Long Island City, NY Ornamental Metal Fabricators and Erectors: American Architectural Bensalem, PA; Allied Bronze LLC Long Island City, NY Curtain Wall Fabricator: Permasteelisa Cladding Technologies Windsor, CT Curtain Wall Erector: Tower Installation LLC Windsor, CT Metal Deck Erector: A.C. Associates Lyndhurst, NJ

With its LEED Silver certification, this five-story, 78,000 square foot building is the first green public building in New York. Its steel structural system allowed for its unique design features, including unusually shaped cantilevers and roof framing, highlighting steel’s flexibility and adaptability. Owner: The New York Public Library New York, NY Architect: Dattner Architects New York, NY Structural Engineer: Severud Associates New York, NY General Contractor: F.J. Sciame Construction Co., Inc. Wilmington, DE Structural Steel Fabricators: Helmark Steel, Inc. Wilmington, DE Structural Steel Erectors: Falcon Steel Co., Inc. Wilmington, DE Miscellaneous Steel Fabricator and Erector: Post Road Iron Works, Inc. Greenwich, CT Ornamental Metal Fabricator and Erector: Airflex Industrial, Inc. Farmington, NY Curtain Wall Fabricator and Erector: Neversink Construction Corp. White Lake, NY

This Gehry-designed building employed a special anchoring system to install the aluminum frame curtain wall system, accommodating panels of different shapes and sizes with a sophisticated bracketing and installation system.

Steel answered the challenges posed by this high-rise laboratory because of its ideal weight, flexibility for future adaptation and cost-effectiveness. To minimize floor vibration, unusually deep steel girders and W18 and W24 shapes offer rigidity to accommodate the versatile floor plans. Owner: NYC Office of the Chief Medical Examiner New York, NY Architect: Perkins Eastman Architects New York, NY Structural Engineer: Severud Associates Consulting Engineers New York, NY Curtain Wall Consultant: Gilsanz Murray Steficek New York, NY Construction Manager: Gilbane/TDX J.V. New York, NY General Contractor: T.A. Ahern Contractors Corp. Woodside, NY Structural Steel Fabricator: Kline Iron and Steel Corp. Columbia, SC Structural Steel Erector: A.J. McNulty & Co. Inc. Maspeth, NY Curtain Wall Fabricator: Sota Glazing, Inc. Brampton, Ontario, CA Curtain Wall Erector: W&W Glass Systems, Inc. Nanuet, NY Precast Erector: A.J. McNulty & Co., Inc. Maspeth, NY Metal Deck Erector: Solera Construction, Inc. New York, NY

This remarkable $19 million building embodies the image of a notable cultural institution. Structural steel supports the long-spans of an open and vertically spacious building, timelessly designed but flexible enough to accommodate for future growth. Owner: The Bronx Museum of the Arts Bronx, NY Developers: New York Department of Cultural Affairs New York, NY; Department of Design and Construction Long Island City, NY Architect: Arquitectonica New York, NY Structural Engineer: Thornton Tomasetti Group, Inc. New York, NY Construction Management: New York City Department of Design and Construction Long Island City, NY General Contractors: M.A. Angeliades Long Island City, NY; PMS Construction Management New Rochelle, NY Structural Steel Erectors: E-Z Erecting Corp. Astoria, NY Miscellaneous Steel Erector: E-Z Erecting Corp. Astoria, NY Architectural Metal Fabricator: Omnitec Building Systems, Inc. St. Laurent, Quebec, CA Architectural Metal Erector: Jordan Panel Systems Corp. Northport, NY Ornamental Metal Erector: E-Z Erecting Corp. Astoria, NY Curtain Wall Fabricator: Omnitec Building Systems, Inc. St. Laurent, Quebec, CA Curtain Wall Erector: Jordan Panel Systems Corp. Northport, NY

A two story lobby water feature of glass and stainless steel, the Icefall represents the highest level of design and craftsmanship. The artistic structure is not only visually arresting, but functional, running on collected rainwater to cool and humidify the spacious seven story, sky-lit column free atrium. Owner: Hearst Corp. New York, NY Developer: Tishman Speyer New York, NY Architect: Foster and Partners London, UK Associate Architect: Adamson Associates New York, NY Architectural Design Consultant: James Carpenter Design Associates New York, NY Structural Engineer: WSP Cantor Seinuk New York, NY General Contractor: Turner Construction New York, NY Structural Steel Fabricator: Cives Steel Company Gouvernor, NY Structural Steel Erector: Cornell and Company Westfield, NJ Miscellaneous Steel Fabricator and Erector: Empire City Iron Works Long Island City, NY Ornamental Metal Fabricator and Erector: Allied Bronze LLC Long Island City, NY Curtain Wall Fabricator: Permasteelisa Cladding Technologies LTD Windsor, CT Curtain Wall Erector: Tower Installation LLC Windsor, CT

60 stories of glass curtainwall, this sleek residential high-rise condominium is the first building in New York to utilize a new hybrid installation system, cutting the cost of installation. Prefabricated panels were erected around each floor, rather than by elevation, allowing installers to complete the job two floors at a time. Owner: CRP/IMICO 350 West 42nd Street L.P. New York, NY Developer: Extell Development Company New York, NY Architect: Cetra/Ruddy New York, NY Structural Engineer: WSP Cantor Seinuk New York, NY Curtain Wall Consultant: Sota Glazing, Inc. Brampton, Ontario, CA Curtain Wall Fabricator: Sota Glazing, Inc. Brampton, Ontario, CA Curtain Wall Erector: W&W Glass Systems, Inc. Nanuet, NY

Steel breathed new life into this venerable New York icon, built in 1903. Nearly every structural component has been replaced or refurbished on this 18-year rehabilitation project, which will have incorporated 29,000 tons of structural steel, millions of hours of labor provided by hundreds of ironworkers and other skilled craftspersons, and more than $1.2 billion in construction costs. Owner: New York City Department of Transportation New York, NY Designer: Parsons Transportation Group New York, NY Resident Engineer: Greenman-Pedersen Babylon, NY General Contractor: Koch Skanska Carteret, NJ Structural Steel Fabricators: American Bridge Coraopolis, PA; Michelman-Cancelliere Ironworks, Inc. Lehigh Valley, PA; JA McMahon Niles, OH; Northeast Structural Steel Yonkers, NY Structural Steel Erector: Koch Skanska Carteret, NJ Miscellaneous Steel Fabricators: Hurtt Fabrication Marceline, MO; Regal Industries Painesville, OH; Shenandoah Steel Corp. Lansdale, PA; Wecall, Inc. Orwell, OH; Francis A. Lee Company Hicksville, NY; Strocchia, Patsy & Sons Iron Works, Inc. Brooklyn, NY; Seibel Modern Manufacturing & Welding Corp. Lancaster, NY Miscellaneous Steel Erector: Koch Skanska Carteret, NJ Architectural Metal Fabricator: Allen Architectural Metals Talladega, AL Architectural Metal Erector: Koch Skanska Carteret, NJ Ornamental Metal Fabricator: Selco Manufacturing Corp. West Caldwell, NJ Ornamental Metal Erector: Koch Skanska Carteret, NJ

Security and design upgrades were foremost in the selection of steel for the retrofitting of this Brooklyn Courthouse. A paragon of high-rise building safety, aesthetic considerations included raising the ceiling between beams and reducing floor thickness to create an open, inviting space Owner: United States General Services Administration New York, NY Design Architect: Pelli Clarke Pelli Architects New York, NY Architect of Record: HLW International New York, NY Structural Engineer: Narov Associates New York, NY Curtain Wall Consultant: Gordon H. Smith Corp. New York, NY General Contractor: Bovis Lend Lease New York, NY Inspection: URS Corp. New York, NY Steel Inspection: Cole Consulting Structural Steel Fabricators: ADF Steel Corp. Canada Structural Steel Erector: DCM Erectors, Inc. New York, NY Miscellaneous Steel Fabricator and Erector: Post Road Iron Works Greenwich, CT Architectural Metal Fabricator and Erector: Airflex Industrial, Inc. New York, NY Ornamental Metal Fabricator: SRS, Inc. Metuchen, NJ Ornamental Metal Erectors: Airflex Industrial, Inc. New York, NY; SRS, Inc. Metuchen, NJ Curtain Wall Fabricator: LBL Sky Systems Bois-des-Filion, Quebec, CA Curtain Wall Erector: Solera/DCM New York, NY Metal Deck Erector: Walker/Solera/DCM New York, NY