Chicago, IL

900 West Washington Boulevard


With its compact size and industrial aesthetics, 900 West blends with its West Loop neighborhood. The building includes twenty-two luxury condominiums, two penthouse units with city views, large private balconies, and enclosed parking at grade. SGH is the structural engineer of record and consulted on the building enclosure and hydronically heated concrete topping slabs.

Highlights of our structural design include:

  • Collaborating with the project team to evaluate alternate structural systems
  • Selecting a cast-in-place concrete structure to provide thin floor profiles with future flexibility and accommodate a future topping slab for radiant heating
  • Creating a REVIT model used for spatial and production coordination
  • Preparing core-and-shell permit drawings and helping obtain city approval
  • Designing transfer girders at Level 9 to support a two-story, set-back penthouse structure and at Level 2 to span drive lanes and parking below
  • Detailing grade beams and caisson foundations to clear the property line, while permitting columns to be located adjacent to it
  • Specifying materials and procedures for exposed concrete topping slabs to accommodate hydronic heating and achieve the desired polished finish
  • Designing a suspended hybrid steel/concrete structure over a large opening

We also consulted on the building enclosure, including:

  • Blind-side waterproofing, including developing details to integrate it with the positive-side waterproofing and vapor barrier
  • Window wall system, including participating in a laboratory mockup, observing field testing, and helping resolve field conditions to mitigate leakage
  • Aluminium composite material (ACM) panel cladding system, including developing details to integrate it with the window wall system
  • Air/vapor/thermal barriers to maintain continuity and transition to wall openings
  • Balcony and roofing systems, featuring vegetative trays, pavers, and ballast

Project Summary



Completion Date
New Construction
Building Enclosures | Structures
Northworks Architects and Planners, LLC
Specialized Capabilities
Building Design | Roofing & Waterproofing

Key team members

Peter Babaian
Peter Babaian
Building Technology Division Head, Chicago