One North Wacker
One North Wacker, UBS Tower is a 50-story skyscraper at One North Wacker Drive in downtown Chicago, Illinois. The tower was built from 1999 to 2002 to accommodate Swiss investment bank UBS AG's Chicago headquarters. Originally UBS Tower, as it was solely known then, housed four different branches of the bank including its investment banking, wealth management advisory, asset management, and private banking businesses.
One North Wacker was designed by Lohan Associates and developed by John Buck Company. It is owned by the California-based Irvine Company, which also owns 71 South Wacker and 300 North LaSalle.
Building
The UBS Tower was the first large multi-tenant tower to be constructed in Chicago for six years since 1993.Architecture
The tower's main lobby's glass wall was a first in the United States. The wall was made out of 5' x 5' glass panes attached to a system of medallions and cable. This cable system was tested at pressures above 150 psf, or a wind speed of nearly 250 mph. The glass itself is also noteworthy: an optical interference anti-reflective glass with an unusually low surface reflectivity of 1% is used. This imbues the lobby with an almost transparent appearance.Exterior landscaping was designed by the Berkeley, California-based firm, Peter Walker and Partners Landscape Architecture Inc.
Enclos, a facade engineering and curtain wall design company, designed and installed the first ever cable net glass wall in the United States at the lobby area of One North Wacker in downtown Chicago. The cable net strategy developed effectively minimized the sightlines of the steel support structure supporting the glass, allowing architect Goettsch Partners to achieve maximum transparency with a series of 15 meter glass facades that wrap the perimeter of the lobby space in over 1,500 square meters of glass.