){kind=spacer}
Greenwich West
A 466-foot residential tower in Lower Manhattan, Greenwich West includes 89 luxury condominiums above a new elementary school. The project’s triangular site and adjacency to the 1809 landmarked Dickey House posed major structural challenges.
DeSimone designed a new cast-in-place concrete structure, and devised a temporary steel skeleton to support, stabilize, and protect the historic masonry façade of the Dickey House during the gut demolition of the interior for a new school program. The tower’s floor slabs connect back to this new structure, providing permanent lateral support.
| Client | Trinity Place Holdings |
|---|---|
| Architect: | FXCollaborative |
| Size | 38 Stories | 282,000 SF (26,198 SM) | 89 Units |
| Sustainability | LEED Silver Certified |
| Office: | New York |
| Completion: | 2022 |
Designing the foundations posed a number of unique challenges. The site sits between two subway tunnels, with an existing pre-war, unreinforced masonry building to the north and a fragile, landmarked masonry structure to its south. To limit vibrations that could impact the historic structure and subway tunnels, our foundation design featured 12-inch drilled mini-piles and 24-inch secant piles. Some secant walls serve as permanent supports for columns and shear walls, with reinforced concrete cap beams transferring loads efficiently across the irregular footprint.
To create expansive interiors for the base school level, we designed two major transfer systems featuring large steel plate girders at the 8th and 11th floors to carry residential loads over open, column-free spaces. The residential floors above the school feature 11-foot ceiling heights and column-free spans up to 30 feet, as well as sweeping views of New York Harbor.
The site’s triangular shape coupled with the tower’s core lying partially outside the site perimeter meant the structure would be vulnerable to torsion under high winds. Our structural engineers added supplemental slabs throughout the top floors and a system of in-slab beams for added stiffness and stability.
