With a 44 percent vacancy rate and little foot traffic, Trolley Square is not the thriving Salt Lake City mall it used to be. Millionaire businessman Khosrow Semnani is hoping to change that. Semnani, Utah Heritage Foundation's Kirk Huffaker and Tribune reporter Christopher Smart join Jennifer Napier-Pearce to discuss Semnani’s plans for the historic block and if the vision will work in a changing retail environment hit hard by online sales.