bld_madisonCompleted at a cost of $65 million, 360 Madison Avenue, New York City, was unusual because it combined a renovated old building with a completely new one. The old building was located on the same Madison Avenue lot as the current structure. It was a 120,000-square-feet steel structure originally built in 1910 as a stone-clad Abercrombie & Fitch department store. In the 1970s it was relaunched with a reflective glass curtain wall and turned into an office building.

For the current project, the old building was stripped to its steel frame and the original 17-floor frame extended to 23 stories. The adjacent building was demolished and replaced with a new 26-story tower with a concrete superstructure.

Richard Cook & Associates, Architects, working closely with structural engineer Jacob Grossman, a principal with Rosenwasser/Grossman Consulting Engineers PC of New York City, combined the two into a new 355,000-square-foot office building with a distinctive white painted aluminum and glass façade.

The steel and concrete superstructures were constructed 1 foot apart and the floors of the concrete building were built about 1/10th inch higher than the steel floors. This will allow for shrinkage of the concrete and provide a level floor space between the two joined structures, so as the new building settles, it will remain as level as possible. The 1 foot separation between the buildings will allow for an additional leveling of floors. The two buildings are intertwined because the developer wanted a large footprint for the office space.

Another issue was the seismic code requirement for New York City. Normally, this requirement would affect the new building only. But by enlarging the footprint and joining the two structures, additional seismic forces were created requiring the potential need for a seismic isolation joint to separate the two structures. However, the developer did not want a seismic joint between the two buildings because it would have created, in effect, two separate buildings. The solution provided by Rosenwasser/Grossman was to build the new building using concrete to support forces which the existing building could not sustain on its own.


Madison 45 Co., New York, New York

Richard Cook & Associates, New York, New York

Structural Engineer:
Rosenwasser/Grossman Consulting Engineers, New York, New York

MEP Engineer:
Jaros, Baum & Bolles, New York, New York

Curtainwall Contractor:
Permasteelisa Cladding Technologies, Windsor, Connecticut.

Structural Steel Fabricator & Erector:
ADF Steel Corp., Montreal, Canada

Concrete Contractor:
Carlton Concrete Corp., Floral Park, New York

Excavation & Foundation Contractor:
Civetta Cousins JV., Bronx, New York

General Contractor:
Pavarini McGovern Construction Co., New York, New York