Here’s who bought the Millennium Tower’s penthouse

By Tim LoganGLOBE STAFF JUNE 16, 2016 The buyer of the most expensive condominium in Boston is a South Shore boy turned billionaire who renounced his US citizenship nearly two decades ago for tax purposes, meaning he can’t live full time in his $30-million-plus penthouse. The 13,000-square-foot unit atop the 60-story Millennium Tower in Downtown…