Construction of the Memorial Sloan-Kettering Cancer Research Center, one of the tallest research facilities in the world, was an experiment in itself. The design of architects at Skidmore, Owings, & Merrill and Zimmer Gunsul Frasca meets the rigorous requirements of the laboratories and also cantilevers 13 levels over an existing building that will be demolished in phase two of construction. Owner: Memorial Sloan-Kettering Cancer Center; Division of Facilities Management New York, NY Project Manager: Granary Associates New York, NY Architects: Skidmore, Owings & Merrill LLC New York, NY; Zimmer Gunsul Frasca Partnership Portland, OR Structural Engineer: Skidmore, Owings & Merrill LLC Chicago, IL General Contractor: Turner Construction New York, NY Structural Steel Fabricators: Kline Iron and Steel, Inc. Columbia, SC; Cives Steel Company Gouvernor, NY Structural Steel Erector: Cornell and Company Woodbury, NJ Miscellaneous Steel Fabricators: Cornell and Company Woodbury, NJ; Cives Steel Company Gouvernor, NY Miscellaneous Steel Erectors: Cornell and Company Woodbury, NJ; Post Road Iron Works Greenwich, CT; FMB, Inc. Harrison, NJ; Superior Erectors Centereach, NY Ornamental Metal Fabricators: Coordinated Metals, Inc. Carlstadt, NJ; All State Erectors Centereach, NY Ornamental Metal Erectors: Coordinated Metals, Inc. Carlstadt, NJ; Ornamental Erectors West Hempstead, NY; McFarlane Contracting LLC Hackensack, NJ Curtain Wall Fabricators: Permasteelisa Cladding Technologies Windsor, CT; Allied Bronze LLC Long Island City, NY Curtain Wall Erectors: Tower Installation LLC Windsor, CT; Diamond Installations Long Island City, NY

Polshek Partnership Architects of New York City avoided the typical institutional look of healthcare centers when designing the new Ambulatory Care and Education Facility for the Joan and Sanford I. Weill Medical College. By wrapping the 15-story building in a reflective glass skin that mirrors the surroundings, the building exudes calm and beauty. Owner: Cornell Weill Medical College New York, NY Architect: Polshek Partnership Architects New York, NY Structural Engineer: Severud Associates New, NY Curtain Wall Consultant: R.A. Heintges & Associates New York, NY General Contractor: Bovis Lend Lease New York, NY Structural Steel Fabricator: Cives Steel Company Gouvernor, NY Structural Steel Erector: Cornell & Company, Inc. Woodbury, NJ Curtain Wall Fabricator: Permasteelisa Cladding Technologies Windsor, CT Curtain Wall Erector: Tower Installation LLC Windsor, CT

John Ciardullo Associates expanded an existing 68,000 square-foot, one-story building to 140,000 square feet over two floors. The 84.5 tons of steel recycled from the existing frame make this high school campus an A+ example of sustainable design. Owner: NYC Board of Education/NYC School Construction Authority New York, NY Developer: NYC School Construction Authority New York, NY Architect and Structural Engineer: John Ciardullo Associates, P.C. New York, NY General Contractor: DeMatteis Construction Corporation Elmont, NY Structural Steel Fabricator and Erector: MoMetal Structures, Inc. Varennes, Quebec, CA Miscellaneous Steel Fabricator and Erector: MoMetal Structures, Inc. Varennes, Quebec, CA Architectural Metal Fabricator and Erector: MoMetal Structures, Inc. Varennes, Quebec, CA Ornamental Metal Fabricator and Erector: MoMetal Structures, Inc. Varennes, Quebec, CA

Architects wanted the 52-story, 1.6 million-square-foot New York Times building to communicate the idea of transparency at The New York Times. The sleek and tapered exposed steel structure does just that, while providing large, open office bays and adaptable space. Owners: The New York Times Company New York, NY; Forest City Ratner Companies Brooklyn, NY Developer: Forest City Ratner Companies Brooklyn, NY Architects: Renzo Piano Building Workshop Paris, FR; FXFowle Architects, PC New York, NY Structural Engineers: The Thornton Tomasetti Group, Inc. New York, NY General Contractor: AMEC New York, NY Structural Steel Fabricators: W&W Steel Co. Oklahoma City, OK; SMI-Owen Steel Co. Columbia, SC; Afco Steel Little Rock, AR Structural Steel Erector: DCM Erectors, Inc. New York, NY Structural Steel Erector: DCM Erectors, Inc. New York, NY Miscellaneous Steel Fabricators and Erectors: W&W Steel Co. Oklahoma City, OK; SMI-Owen Steel Co. Columbia, SC; Afco Steel Little Rock, AR Structural Steel Erector: DCM Erectors, Inc. New York, NY Miscellaneous Steel Fabricators and Erectors: Empire City Iron Works LIC, NY; Skyline Steel Corp. Brooklyn, NY; Hillside Ironworks, Inc. Waterford, NY Curtain Wall Fabricator and Erector: Benson Industries New York, NY Metal Deck Erector: Solera/DCM, Inc. New York, NY

Half the fun of Longchamp’s new 5,000-square-foot boutique in Soho is getting there. The delicate, ribbon-like stair that entices passersby to make the one-flight climb is actually made from 55 tons of 1 ¼ inch-thick steel plate. Owner: Lonchamp Paris, FR Architect: Heatherwick Studio London, UK Architect of Record: Atmosphere Design Group Mount Kisco, NY Structural Engineer: Helmut Jobs, Building Structural Engineering Services General Contractor: Shawmut Design and Construction Boston, MA Structural Steel Fabricator and Erector: Hillside Ironworks, Inc. Waterford, NY Architectural Metal Fabricator and Erector: Hillside Ironworks, Inc. Waterford, NY Ornamental Metal Fabricator and Erector: Hillside Ironworks, Inc. Waterford, NY

This 207,000-square-foot addition to New York’s Bellevue Hospital houses specialized services, including cancer care, radiology, pediatrics, and psychological services, while respecting Bellevue’s historic entrance. A block-long, 90-foot-high glazed atrium, supported by a system of steel bow trusses, echoes the hospital’s original monumental entrance. Owner: Health and Hospitals Corporation New York, NY Developer: Dormitory Authority of the State of New York New York, NY Architect: Pei Cobb Freed & Partners Architects LLC New York, NY Renovation Architect: Guenther 5 Architects New York, NY Structural Engineer: Leslie E. Robertson Associates New York, NY General Contractor: Turner Construction New York, NY Structural Steel Fabricators: SteelCo./Metropolitan Steel Industries, Inc. Sinking Spring, PA Structural Steel Erectors: Midlantic Erectors, Inc. Roselle, NJ Architectural Metal Fabricator and Erector: Champion Metal & Glass Deer Park, NY Ornamental Metal Fabricator and Erector: Christy’s Glass Jamaica, NY Curtain Wall Fabricator and Erector: W&W Glass System, Inc. Nanuet, NY Metal Deck Erector: A.C. Associates Lyndhurst, NJ

The extra lanes added on to the Bronx-Whitestone Bridge in its 60-plus years of use led to a weight problem and undue strain on the aging structure’s suspension cables. Weidlinger Associates designed a new deck-stiffening system, and the original poured concrete steel grid deck will be replaced with a lighter steel orthotropic deck in the next phase of construction. Owner: MTA Bridges and Tunnels New York, NY Structural Design Engineer: Weidlinger Associates, Inc. New York, NY General Contractors: Joint venture Perini Corp. Framingham, MA; O&G Industries Torrington, CT Construction Management: GPI/Parsons Bronx, NY Structural Steel Erector: Perini/O&G

This credit union headquarters needed to be constructed efficiently, with a tight budget and an open mind. HLW International’s flexible steel design ensures that future spatial changes, like an extra staircase or shift in loading, could be accommodated without incurring exorbitant renovation costs. Owner: United Nations Federal Credit Union New York, NY Architect and Structural Engineering: HLW International LLP New York, NY General Contractor: Tishman Construction New York, NY Structural Steel Fabricator: Cives Steel Company Gouvernor, NY Structural Steel Erector: AJ McNulty & Co., Inc. Maspeth, NY Miscellaneous Steel Fabricator and Erector: Empire City Iron Works Long Island City, NY Architectural Metal Fabricator and Erector: Allied Bronze LLC Long Island City, NY Ornamental Metal Fabricator and Erector: Allied Bronze LLC Long Island City, NY Curtain Wall Fabricator: Permasteelisa Cladding Technologies Windsor, CT Curtain Wall Erector: Tower Installation LLC Windsor, CT Cable Net Wall Fabricator: Permasteelisa Europe Cable Net Wall Erector: Tower Installation LLC Windsor, CT Metal Deck Erector: A.C. Associates Lyndhurst, NJ

The steel, aluminum and unique saw-tooth pattern glass curtain wall system meet post 9/11 security requirements while creating an inviting, daylight-infused building. Thirty-foot cantilevers and hung stairwells add to the airy feel of this blast-resistant structure. Owner: City of New York, Department of Citywide Administrative Services New York, NY Developers: Dormitory Authority of the State of New York New York, NY Architects: Rafael Viñoly Architects PC New York, NY; DMJM Harris Architects and Engineers New York, NY Structural Engineer: Ysrael A. Seinuk, PC New York, NY General Contractor: Bovis Lend Lease New York, NY Structural Steel Fabricator: SMI Owen Steel Co. Columbia, SC Structural Steel Erector: AJ McNulty & Co., Inc. Maspeth, NY Miscellaneous Metal Fabricator and Erector: Post Road Iron Works Greenwich, CT Ornamental Metal Fabricator and Erectors: A-Val Architectural Metals Corp. Collegepoint, NY; Kosson Architectural Aluminum & Glass, Inc. Passaic, NJ Curtain Wall Erectors: Ornamental Installation Specialists Warwick, NY; Enclos Corp. Egan, MN Metal Deck Erector: Solera Construction, Inc. New York, NY

The steel, aluminum and unique saw-tooth pattern glass curtain wall system meet post 9/11 security requirements while creating an inviting, daylight-infused building. Thirty-foot cantilevers and hung stairwells add to the airy feel of this blast-resistant structure. Owner: City of New York, Department of Citywide Administrative Services New York, NY Developers: Dormitory Authority of the State of New York New York, NY Architects: Rafael Viñoly Architects PC New York, NY; DMJM Harris Architects and Engineers New York, NY Structural Engineer: Ysrael A. Seinuk, PC New York, NY General Contractor: Bovis Lend Lease New York, NY Structural Steel Fabricator: SMI Owen Steel Co. Columbia, SC Structural Steel Erector: AJ McNulty & Co., Inc. Maspeth, NY Miscellaneous Metal Fabricator and Erector: Post Road Iron Works Greenwich, CT Ornamental Metal Fabricator and Erectors: A-Val Architectural Metals Corp. Collegepoint, NY; Kosson Architectural Aluminum & Glass, Inc. Passaic, NJ Curtain Wall Erectors: Ornamental Installation Specialists Warwick, NY; Enclos Corp. Egan, MN Metal Deck Erector: Solera Construction, Inc. New York, NY