Leonard Koroski

Len Koroski is a principal and senior project architect at Goettsch Partners. Joining in 1979, he has spent the majority of his career at the firm. 

Len has a particular expertise and passion for historically sensitive projects, including renovation, preservation and adaptive reuse assignments. This work has primarily focused on buildings in downtown Chicago, including signature properties such as the iconic Wrigley Building, the Jewelers Building at 35 East Wacker Drive, the Civic Opera Building, and Union Station, as well as several buildings along LaSalle Street and Michigan Avenue. He has also been involved in the recent adaptive reuse of two office buildings that were partially and fully converted into new hotels: The Langham Chicago and LondonHouse Chicago respectively.

Len has extensive experience in historical research, materials analysis, and life safety and infrastructure improvements. He has worked with the Chicago Landmarks Commission, the Illinois Historic Preservation Agency, and the National Park Service in obtaining historically sensitive and pragmatic reviews of projects. In addition, Len is a LEED Accredited Professional with an interest in environmental stewardship and efficiency in older buildings.

Outside the firm, Len has held key volunteer roles in the American Institute of Architects, serving as the president of AIA Illinois, a member of the AIA national board of directors, and co-chair of the AIA national Committee on the Environment.

Len received his Bachelor of Architecture degree from the Illinois Institute of Technology. He was elevated to the distinguished AIA College of Fellows in 2012.