WHAT IF… New York´s SEAGRAM Building was a HYBRID building


This is an unreal scenario in New York, in 1955, imaging that the designers of the famous 39-story Seagram Building, Mies Van Der Rohe and Phillip Johson, knew the technical advance of mixing steel, concrete and wood in structures (Hybrid structures tech) and could get a low impact on environment, based on CO2 fingerprint materials and passive solar building design knowledge.

Key benefit

Mixing concrete and steel in a rigid and heavy base of the building, with light and flexible wood slabs around its core and upper levels, can get a lighter building and very resistant to wind (aprox. 41% less dead loads).

Material list

Kerto-S-LVL Beams

Ecological values

A building with a concrete and steel mix in a heavy base, with light and flexible wood slabs around its core and upper levels, reduces the embodied CO2 in materials by aprox. 68% of the normal steel + concrete buildings. The redesigning of the structure also allows to change the single-glass window system for a double-paned system and to modify some building details in order to save aprox. 30% of energy consumption.



  • Economical span (mm)
  • Thickness (mm)
  • Airbourne sound reduction factor (dB)
  • Impact sound transmission (dB)
  • Resistance to fire class
  • Thermal properties



Filename Size

Facade on Park Avenue JPG1423 KB
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  • This Hybrid City competition entry looks at an 80 year old, high rise, existing structure in steel, concrete and glass and shows where Kerto-LVL can replace the existing material. The entry looks at the approach of the original designer and enhances it by making it lighter and reducing the embodied carbon in the final building. Although the structural design is not detailed, the idea has embraced the brief of the competition in full. An inspiring idea to revisit revered designer's solutions with a new view point having sustainability in mind.


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