Pittsburgh has often been named the nation's most livable city, but how many people actually consider living downtown? Downtown Pittsburgh is in the midst of another major transformation and for the first time ever housing is a key part of the plans. WQED's Tonia Caruso explores this growing real estate trend, introduces people who live Downtown and shows the places they call home. From the practical to the posh, you might be surprised at what's available and what it means to the future of Pittsburgh.