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CHICAGO — Motorola Mobility, a smartphone maker owned by Google Inc., is relocating its headquarters to Vornado Realty Trust's Merchandise Mart in Chicago. The company, currently based in Libertyville, Ill., has signed an office lease for 572,000 square feet. The 3.5 million-square-foot Merchandise Mart is the world's biggest commercial building, according to a statement by Vornado. Motorola is expected to move to the building in early 2013.