One of the Strip District’s largest buildings has been sold to one of Pittsburgh’s fastest-growing businesses. A 120,000-square-foot former mattress factory at 2839 Liberty Ave. is under agreement to Storage Development Inc., a company owned by Steve Cohen, who also owns East Liberty-based Guardian Storage Solutions. Cohen signed a sales agreement for the property last week and will now undergo a due diligence period before closing on the purchase of the 100-year-old structure, which is comprised of three adjoining buildings.

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