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56 Leonard Street, New York, NY

Project data

Location: Manhattan, New York, United States

New York City skyline, 56 Leonard is expected to set new benchmarks for luxury condominiums. Designed by the Swiss firm Herzog & de Meuron, the residential tower has a Jenga-like appearance with multiple cantilevered layers throughout its height.
Forming balconies was particularly difficult because many go around corners. PERI accommodated the resulting unique challenges with custom solutions using standard components such as GT 24 Girders for the slabs and platforms supported by MULTIPROP aluminum shores, SRU Walers and SRS Spindles for transferring the loads at angles and for perimeter protection. Tight schedules and limited space for material storage added to the challenge. 


  • Unique shoring and bracing solution for countless cantilevered balconies going around corners
  • Innovative custom perimeter protection solution
  • Innovative custom slab formwork solution
  • Just in time delivery because of New York traffic situation


Sorbara Construction, Corp., Lynbrook, NY

Customer's benefit

  • PERI was able to meet the challenging requirements of providing a formwork, shoring and perimeter protection solution for the unique structure with its more than 300 cantilevered balconies
  • PERI ensured just in time delivery to the job site as the contractor was only able to receive in certain time windows due to New York traffic
  • PERI engineers collaborated with the customer to develop creative and innovative solutions for the construction of this unique tower
Tom McGeown
Project Superintendent

“The 56 Leonard Street project had over 300 cantilevered balconies that required a perimeter protection system with custom solutions and PERI was able to meet the challenge.”

PERI solution

  • Custom formwork, shoring and perimeter protection requirements
  • Excellent engineering and logistics support