731 Lexington Avenue
Recognized for its 9-story elliptical courtyard connecting 58th and 59th Streets in Midtown Manhattan, the mixed-use 731 Lexington Avenue skyscraper serves as the world headquarters of Bloomberg LP and boasts 105 luxury condominiums with sweeping views of Central Park. At the 10-story podium base of the tower a seven-story atrium, dubbed The Link, creates a large, open gathering space for the public while also bringing daylight deep into the building in addition to 250,000 SF of retail.
| Client | Vornado Realty Trust |
|---|---|
| Architects: | SLCE Architects and Pelli Clarke & Partners |
| Size | 57 Stories | 806 Feet (246 M) | 1,345,489 SF (125,000 SM) | 105 Units |
| Sustainability | LEED Gold, Fitwel 3-Star Rating, ENERGY STAR Label, BOMA 360 Certification |
| Office: | Overland Park |
| Completion: | 2005 |
With a structure that shifts seamlessly between commercial and residential elements, the 57-story glass skyscraper relies heavily on steel to support the lower 30 floors of its hybrid structural system. Our structural engineers assisted with steel package management and connection design, focusing on the joints holding the steel frame together, performing sophisticated calculations and producing detailed drawings to ensure that all main frame structural elements— structural beams, bracing, and columns—perform in accordance with the design intent, demonstrating the precision required for large-scale vertical innovation in towers like 731 Lexington.
The upper 25 residential floors transition to a reinforced concrete structure, with massive transfer girders or "transfer floors" redistributing loads from the concrete structure into the steel office columns below, allowing the stacking of two completely different types of environments—high-activity corporate offices and quiet, luxury residential units—into a single footprint.
