An interesting but not well-known fact about the 32 story BCBS building (completed in 1997) is that it was originally designed to accomodate future vertical growth of 24 more stories. This is apparent from the large atrium and open space in the middle of the building, elevators to serve the new upper floors will go here.

Now Health Care Service Corp. (HCSC), parent of BCBS of Illinois plans to approach the city about getting approval to go ahead with the addition which may be complete by 2010. By that time 340 on the Park, Treasure Island, Lakeshore East Aqua and The Tides building across the park will all be finished.

More information at Chicago Business

BCBS Tower building information on Emporis