Thomas Roszak Architecture


Adjustable Forms, Inc. (concrete contractor)


Chicago, IL


This project is a new 35-story, 366,834 SF tower at 215 W Lake Street in Chicago, IL. The site was home to a parking garage, which was demolished to make way for the new 265-unit residential tower. The building features three floors of parking, two floors of amenities, including a fitness center, pool, spa, outdoor terraces, cafe, social room, and conference rooms.

Client Benefits

BASE performed value engineering services on the post-tensioned slabs and vertical elements. A vertical load take-down analysis was conducted, which resulted in an average 2000 psi reduction in column concrete grade throughout the building, and a net savings of around $35,000. Other recommendations were made for slab post-tensioning and reinforcement. Without impacting the design concept or space usage, a total proposed savings of $535,000 was achieved.

The Science and Design of Structural Engineering

BASE studied the typical parking and residential levels in detail using 3D finite element analysis to optimize the layout of the post-tensioned cables and mild steel reinforcement, while maintaining or improving slab performance. Stud rails were eliminated at a majority of columns.