Hudson Commons: Innovation at Its Core

The vision of constructing a 17-story skyscraper on top of an existing office building is nearly a reality, thanks in part to WSP USA’s innovative approach to retrofitting the building’s core.

©ILLUSTRATION COURTESY OF KPR/©PHOTO BY WSP USA

The Hudson Commons office tower, as a rendering prior to construction (left) and as seen during construction in mid-September, is blending old with the new, with the construction of a new tower on top of a 1960s-era office building.

©2018 WSP USA

To support the increased load of the new tower, existing concrete columns were retrofitted with cast-in-place shotcrete jacketing, including large diameter bars that ran continuously through the existing floor slabs. 

©ILLUSTRATION COURTESY OF KPF

Existing concrete columns were retrofitted with cast-in-place column jackets that resemble the original buildings 1960s-era architecture.

©ILLUSTRATION COURTESY OF KPF/©2018 WSP USA

Retrofitted steel under the slab meets with a jacketed column to strengthen the existing roof to support exterior green space with potentially large plantings.

©2017 WSP USA

Reinforcing of the existing slabs allowed shoring free demolition for the new concrete core.

©2018 WSP USA

A new cast-in-place concrete core is threaded through the existing structure from foundation to the new roof, providing lateral stability and adequate stiffness to the new building, shown here penetrating the existing roof.