Lessons of 9/11 Shape an Office Tower.

Describes the design and tenancy of a 35-story office building at the southwest corner of 42nd Street and Madison Avenue in New York City. Adjustments made by a private developer, Brookfield Financial Properties, to protect occupants from the impact of terrorist attacks by car bombs; Discussion of the progressive collapse that occurred at the World Trade Center buildings; How the developer could set a de factor standard for future office towers; Comment of Mary Ann Tighe, Richard B. Clark, Lawrence F. Graham, and others associated with the project.