Well hopefully your paper isn't due tomorrow...
I only have the facts you probably already know: Completed in 1974, it's 1,454 feet tall, world's tallest until 1998, etc.
I do know that Sears is technically 9 'cluster towers' which all are 75 feet square. All but 2 of the 9 stop at setbacks as the building goes higher
Okay I'm done. Maybe you could post a quick question about Sears into the Chicago construction thread or the Spire thread to really get some of those Chi-forumers attention for some good sources/info.