The building has no interior columns, which allows for flexible floor plans.
The two-story base, its roof originally decorated with checkerboard patterns, was extensively remodeled in 1988.
Legendary architect Minoru Yamasaki was part of the building's design team while an associate with architect NBBJ, and was considered a key influence in the use of exterior marble and small grid windows.
One of the first major office buildings added to the Seattle skyline in thirty years.
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