When Motorola Mobility lined up a Silicon Valley candidate a few months ago for a VP-level role, the phone maker was hopeful he'd accept. After all, the company offered the chance to develop products at a subsidiary of Google Inc. His reason: the prospect of relocating to Libertyville, Ill., about 35 miles from downtown Chicago, said Scott Sullivan, Motorola's head of human resources. Bloomberg News Motorola Mobility plans to leave its headquarters in Libertyville, Ill., shown. Getty Images Motorola Mobility plans to move into the Merchandise Mart building in downtown Chicago.