Well, if you take the BNSF down to Naperville from Union Station, you are 4 blocks from Sullivan's Steak House (get the bone-in texas ribeye!) and then you are 1 block away from Bull and Bear.
Actually I think they are doing a Puff on the Patio w/ Sullivan Steak House end of July or first of August. Call them and ask!
Here is the link to their website:
Bull and Bear
When will you be in town!? There are a handful of B&M downtown, one of the highly regarded is Jack Schwartz....a few blocks from Union Station in the Chicago Board of Trade building (I might be wrong about the name of the building).