MARIETTA, GA. — Centro Properties Group has sold the 130,013-square-foot Merchant’s Exchange shopping center to Columbia Properties for $17 million. The property was completed in 1986 and renovated in 1997 and spans 11.2 acres at 4400 Roswell Rd. in Marietta. Tenants in the center, which is 98.9 percent leased, include LA Fitness, The Picture Show Movie Theatre and Hancock Fabrics. Whitney Knoll and Richard Reid of Holliday Fenoglio Fowler represented the seller.