Major Addition Planned Atop One Madison Avenue

SL Green Realty plans a dramatic transformation for their existing 13-story office building at One Madison Avenue. 

Designed by architects Kohn Pedersen Fox, the plan calls for 18 new floors of Class-A office space, tenant amenities, and more than an acre of outdoor terraces built atop the existing building.

The present 13-story structure will first be reduced to nine floors to serve as a podium for the 18 new floors to be constructed above. 

Designed as a marquee glass tower, the new structure will have nearly 1.5 million square feet of rentable space, offering 60-foot column-free spans and 14-foot ceilings on each level. 

Private terraces overlooking Madison Square Park will be featured on the podium roof, at the 10th and 11th floors, and at the pinnacle of the new tower.

Also included as part of the redevelopment and expansion, are a revitalized lobby and entry areas, expanded retail space, a new auditorium, and additional events space.

The 1.1 million-square-foot granite building is fully leased by Credit Suisse, which will move out when its lease expires in December or next year. 

Construction is expected to begin in early-2021, following the expiration of tenant lease.