Costco plan for Sanford’s mall has businesses lining up, officials say.

Cities across the country face the same challenge: how to revitalize their malls in a modern age? Most properties like the Seminole Towne Center sit empty — retail relics taking up prime pieces of real estate. For Sanford, the answer may be plans for a new Costco location, but city officials say that’s just the beginning for the old mall site.