HARRISBURG, NC-This town of 3,000, about 10 miles northeast of Charlotte, is about to have a Main Street to call its own. Concord, NC-based J&B Development plans 440 condominium or townhome units, 450,000 sf of retail and 300,000 sf of office for Harrisburg Town Center at Roberta Road and NC 49, the town's main artery.