A faceted façade, creative cantilever and tightly spaced top define the structural system of Manhattan’s new center of trade for diamonds, gems and jewelry.

A new teaching and research building creates a gateway to the school’s science campus with a flexible structural steel design that will accommodate future changes and a four-story atrium that creates informal gathering spaces for students. Location: 250 Bedford Park Blvd. W, Bronx, NY Owner: The City University of New York (CUNY), New York, NY Developer: Dormitory Authority of the State of New York (DASNY), New York, NY Architect: Perkins+Will, New York, NY Structural Engineer: Leslie E. Robertson Associates, New York, NY Mechanical Engineer: Syska Hennessy Group, New York, NY Construction Manager: Gilbane, New York, NY Structural Steel Fabricator: Metropolitan Steel Industries Inc., Sinking Spring, PA Structural Steel Erector: J.C. Steel Corporation, Bohemia, NY Metal Deck Erector: J.C. Steel Corporation, Bohemia, NY

Renovating and expanding “the world’s most famous arena” while it was still open and operating required close collaboration between everyone involved—and some creative engineering to add a new interior level for fans. Location: 4 Pennsylvania Plaza, New York, NY Owner: The Madison Square Garden Company, New York, NY Architect: Brisbin Brook Beynon, Ottawa, ON Structural Engineer: Severud Associates, New York, NY Mechanical Engineer: M-E Engineers, New York, NY Construction Manager: Turner Construction, New York, NY Curtain Wall Consultant: Israel Berger & Assoc. Inc., New York, NY Structural Steel Fabricator: Helmark Structural Steel Inc., Wilmington, DE Structural Steel Erectors: W&W Steel, LLC, Camden, NJ; Stonebridge Steel Erection Co., Inc., South Plainfield, NJ; Titan Erectors, Inc., Woodcliff Lake, NJ Miscellaneous Iron Fabricators and Erectors: Empire City Iron Works, Long Island City, NY; FMB Inc., Harrison, NJ Curtain Wall Erector: W&W Glass LLC, Nanuet, NY Metal Deck Erectors: W&W Steel, LLC, Camden, NJ; Stonebridge Steel Erection Co., Inc., South Plainfield, NJ; Titan Erectors, Inc., Woodcliff Lake, NJ

A new research tower on the Upper East Side medical campus of Weill Cornell Medical College reflects a rethinking of academic science, fostering new ideas in interdisciplinary research behind an advanced, high-functioning facade. Location: 413 East 69th Street, New York, NY Owner: Weill Cornell Medical College, New York, NY Architect: Ennead Architects, New York, NY Structural Engineer: Severud Associates, New York, NY Mechanical Engineer: Jaros Baum & Bolles, New York, NY Construction Manager: Tishman Construction, an AECOM Company, New York, NY Architectural Metal Fabricator and Erector: Coordinated Metals, Inc., Carlstadt, NJ Ornamental Metal Fabricator and Erector: Coordinated Metals, Inc., Carlstadt, NJ Curtain Wall Fabricator: Permasteelisa North America Corp., New York, NY Curtain Wall Erector: Tower Installation, Windsor, CT

In Brooklyn’s burgeoning cultural district, the Theatre for a New Audience’s new headquarters relies on structural sophistication to present an open, welcoming face to the neighborhood and a flexible space to the performers. Location: 262 Ashland Place, Brooklyn, NY Developer: New York City Economic Development Corporation, New York, NY Architect: H3 Hardy Collaboration Architecture, New York, NY Construction Manager: F.J. Sciame Construction Company, New York, NY Structural Engineer: Robert Silman Associates, New York, NY Structural Steel Erector: Atlantic Detail & Erection, Far Rockaway, NY Ornamental Metal Erector: David Shuldiner Inc., Brooklyn, NY Curtain Wall Fabricator: Gartner Steel and Glass (Josef Gartner, USA, a division of Permasteelisa North America Corp.), New York, NY Curtain Wall Erector: Tower Installation LLC, Windsor, CT

A renovation transforms the Flushing museum’s facade, bringing it to life for those passing on Grand Central Parkway; a new vision of its modern mission awaits inside, where a glass lantern suspended from a skylight and a new circulating stair enliven the decades-old space.

Structural steel allows a school to maximize its efficiency with a centrally located auditorium amid long-span spaces for varied student activities. Location: 1-50 51st Avenue, Long Island City, Queens, NY Owner: New York Department of Education, New York, NY Architect: FXFOWLE, New York, NY Structural Engineer: Ysrael A. Seinuk, PC, New York, NY Mechanical Engineer: Kallen & Lemelson, LLP, New York, NY Construction Manager: Skanska USA, New York, NY Structural Steel Erector: Weir Welding, Carlstadt, NJ Miscellaneous Iron Fabricator and Erector: Transcontinental Steel, Inc., Newark, NJ Ornamental Metal Fabricator and Erector: Transcontinental Steel, Inc., Newark, NJ Curtain Wall Erector: Utopia Construction LLC, Farmingdale, NY Metal Deck Erector: Canam Steel, South Plainfield, NJ; Weir Welding, Carlstadt, NJ