To minimize the presence of the stair in the hallway the designer eliminated the need for the outer stringer. Instead, they cantilevered the tread supports from a single stringer located adjacent to the wall. The treads themselves are sandblasted acrylic mounted to a pair of tapered steel angles. The tread design allows for maximum light to pass through to the space below. Glass infill panels create the guard at both the stair rail and surrounding guards. With the use of 2 layers of laminated glass no top rail was required at the guard locations. To support the glass, steel bar stanchions span between floors levels, adding an element of continuity to the various levels of the stacked stair. High levels of precision were required during the detailing and construction process to maintain absolute alignment between 3 levels as the stairway extends from upper bridge to the basement.
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