Blue Cross-Blue Shield Tower

This project is a renovation and replaced Blue Cross-Blue Shield Headquarters

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Height: Occupied
208.3 m / 683 ft
Height: To Tip
226.7 m / 744 ft
Height: Architectural
226.7 m / 744 ft
Blue Cross-Blue Shield Tower Outline
Floors Above Ground
Floors Below Ground
# of Elevators
Tower GFA
217,756 m² / 2,343,906 ft²


Official Name Blue Cross-Blue Shield Tower
Structure Type Building
Status Completed
Country United States
City Chicago
Street Address & Map 300 East Randolph Street
Postal Code 60601
Building Function office
Structural Material composite
  • Core: Reinforced Concrete
  • Columns: Steel
  • Floor Spanning: Steel
Construction Start 2007
Completion 2010
Rankings Click arrows to view the next taller/shorter buildings
Regional Ranking #141 Tallest in North America
City Ranking #21 Tallest in Chicago

Companies Involved

Owner/Developer Health Care Service Corporation
Design Goettsch Partners
Structural Engineer
Design Chris P. Stefanos & Associates; Magnusson Klemencic Associates
MEP Engineer
Design Cosentini Associates
Main Contractor Walsh Construction
Other Consultant
Façade Permasteelisa Group
• Geotechnical STS Consultants, Ltd.
• Property Management CBRE
Material Supplier
• Fire Proofing Grace Construction Products
• Steel ArcelorMittal

About Blue Cross-Blue Shield Tower

300 East Randolph is a unique combination of a build-to-suit headquarters and a multi-tenant office tower in downtown Chicago. The design concept defined an initial building to serve a company’s immediate needs and planned for vertical expansion in the future. Thus the building was constructed in two phases, with the second phase of construction occurring on top of the fully operational phase one, without interrupting existing tenant operations. The project’s 33-story, first phase was completed in 1997 and in 2006 the decision was made to proceed with the initial plan and add 24 stories on top of the existing building. Nearly a decade separated the two phases of construction.

The initial foundations and structure were designed and constructed to support the fully expanded building. Additional riser space also was provided to accommodate independent mechanical, electrical and plumbing systems for the expansion floors. In order to allow the cooling towers on the roof of phase one to continue to serve the building during construction, a three-story gap from the 30th to the 33rd levels was left during construction. Once the new cooling towers were in place, 24 floors above the originals, the old cooling towers were removed, and cladding was applied. This space now serves as a mid-building conference center, providing necessary additional meeting and training space.

Vertical shafts to accommodate the high-zone elevators that service phase two of the project were accommodated in phase one as large atrium spaces that ran the height of the building alongside the low-zone elevator banks along the north wall. Local open stair cases are also located along the northern wall to promote inter-floor interactions without dependency on the elevators.

The entire exterior of the building is clad in glass, stainless steel and stone—all materials that both aged well and were easily matched as the building expanded. As a result of this design planning, there is no visible distinction between the old and new portions of the building, providing a seamless, integrated expression that now achieves its full height and appropriately fits into the Chicago skyline.

CTBUH Initiatives

Venue Confirmed for Awards Conference VIP Reception
29 Mar 2018 – CTBUH News

EMI Lead Chicago Tall-Building Study Trip
25-29 May 2015 – Tour Report

Blue Cross-Blue Shield Tower Chosen as Featured Building
Aug 2012 – Featured Tall Building

More Initiatives

CTBUH Initiatives Related to Blue Cross-Blue Shield Tower

Venue Confirmed for Awards Conference VIP Reception
29 Mar 2018, Chicago – CTBUH News
The reception, kindly sponsored by Lotte Property & Development, will take place in the 30th floor of Blue Cross Blue Shield Tower in Chicago.
EMI Lead Chicago Tall-Building Study Trip
25-29 May 2015, Chicago – Tour Report
A group of 20 Belgian real estate professionals traveled to Chicago from May 25-29 to visit several tall buildings, and related developments as part of a CTBUH Belgium study trip.
Blue Cross-Blue Shield Tower Chosen as Featured Building
Aug 2012, Chicago – Featured Tall Building
The design concept defined an initial building to serve a company’s immediate needs and planned for vertical expansion in the future.
Blue Cross Blue Shield Building Tour
21 Oct 2009, Chicago – Tour Report
Attendees of the 2009 CTBUH Chicago Conference began their conference experience with a technical tour of the recent renovations to Blue Cross Blue Shield Tower.
CTBUH Summer Tour - Blue Cross Blue Shield Tower
17 Jul 2009, Chicago – Tour Report
The final tour of the CTBUH Summer Study Tour series was held at the Blue Cross Blue Shield Headquarters in downtown Chicago.
CTBUH Chicago Helicopter Tour
5 Jul 2009, Chicago – Tour Report
CTBUH members toured many of the extensive Chicago skyscrapers as part of the Chicago Skyscrapers Summer Tour Program.


Blades of Steel: Understanding the Limits of Metal Façade Design
16 Sep 2014 – Patrick Loughran, Goettsch Partners

Vertical Expansion Leads to Innovative Solutions
Oct 2011 – Paul De Santis & Travis Soberg, Goettsch Partners

To submit more information or donate images for this project, please use our submission portal.