Nashville's existing convention center could become a 15-story medical trade center as Dallas-based Market Center Management Co. plans to spend $250 million to redesign the 22-year-old facility. The proposal includes adding 12 stories on top of the convention center to create about 2 million square feet of exhibit space, company executives and city and state officials announced. The repurposed building would house a medical mart showcasing more than 600 healthcare companies' products and technology.
