Hilton Rosemont, 5550 North River Road
Embassy Suites O'Hare Rosemont, 5500 North River Road
Doubletree O'Hare Rosemont, 5460 North River Road

Heck, the Hilton at O'Hare too, then ride the shuttle to the Doubletree, cross the parking lot to the Embassy, then next door to the Hilton Rosemont.

Or, from O'Hare ride the blue line to Rosemont, walk two blocks to the Hilton Rosemont, etc. Don't cross the street until you reach the convention center, though, too dangerous without the crosswalk there.