203 N. Wabash is the adaptive reuse of the historic Old Dearborn Bank Building, a 1928 

steel framed high rise that has been transformed into the Virgin Hotel Chicago. Constructed 

on rock caissons and utilizing a unique two way ribbed joist floor system, the project 

presented significant challenges due to the limited availability of original documentation 

and the absence of structural drawings. Forefront Structural Engineers led the structural 

investigation effort, coordinating selective exploration, field documentation, structural 

analysis, and design to establish a comprehensive understanding of the existing building 

and support its conversion to a modern hospitality destination.

The project involved a series of complex structural modifications, including strengthening 

portions of the existing floor framing, accommodating new elevators and stairs, creating 

a fitness and spa amenity level, constructing a rooftop bar, and developing a new lower 

level below the existing structure. Additional work included selective demolition and 

reconstruction of the original two story atrium, installation of a new entrance canopy, and 

integration of a modern sidewalk elevator entrance. Throughout the design process, the 

team continuously evaluated existing conditions and developed solutions that balanced 

the preservation of historic structural elements with the performance requirements 

of a modern hotel. Extensive coordination with the owner, architect, contractor, and 

preservation stakeholders was required to successfully integrate new program elements 

within the constraints of the nearly century old structure. Through a collaborative process 

of investigation, adaptation, and design, Forefront successfully preserved the character 

of the historic building while enabling a comprehensive modernization that supports its 

continued use for generations to come.