Work with a real estate agent. We have search fields we can work on. If you send me you email and the area of Chicago you are looking at, I will send you what is available, so that you know what is available.
Short-term leases are hard to find and are generally more expensive than a traditional one-year lease. For the most part, buildings that allow shorter leases add a premium onto the quoted monthly rent. Your best bet is probably a sublet or a roommate situation. Look on Craig's List for sublets.