Chicago, IL
Willis Tower Tenant Fitout
Scope/Solutions
The tenant that occupied Floors 42 and 43 in Willis Tower wanted to expand onto Floor 41. SGH served as the structural engineer for the Floor 41 renovation, which included evaluating the existing 1970s steel-framed structure, and designing structural modifications to accommodate programmatic changes and incorporate new stairs between Floors 41 and 43.
SGH performed structural analyses to evaluate the proposed renovations and designed structural modifications and new components, including:
- New kitchen and cafe. SGH evaluated the base building structure for proposed kitchen equipment and food storage loads.
- Three new stairs. The project included constructing a new feature stair connecting Floors 41 and 42, a one-story egress stair connecting Floors 41 and 42 at an existing stair, and a two-story stair connecting floors 41 to 43. SGH developed the structural design for the new stairs; their connections to the base building structure; and supplemental framing to support the stair opening, new glass guards around the openings, and operable fire-rated partitions at egress stairs.
- Training room. We designed framing for operable partitions and evaluated the base building for additional loads.
- Miscellaneous floor openings. SGH evaluated locations for proposed openings in the existing floor slabs and developed details for the openings.
Project Summary
Solutions
New Construction
Services
Structures
Markets
Commercial
Client(s)
Perkins&Will
Key team members
Additional Projects
Midwest
Harlem Irving Plaza
The shopping mall at 4104 Harlem Avenue was constructed in the mid-1950s. The owner wanted to reinvent the Harlem Irving Plaza by subdividing the former Carson Pirie Scott department store into multiple tenant spaces and adding elevators and escalators within a new three-story atrium to improve connectivity between floors. SGH designed structural modifications for the renovations.
Midwest
Tenant Fitout, 200 E. Randolph Street
SGH analyzed the existing structure, designed the new stair, and detailed supplemental framing for the opening in the existing floor.