The loss of population in cities and towns and the movement of businesses and people to the fringes of our core communities are producing thousands of abandoned properties and vacant land across Pennsylvania.  As our core communities hollow out, residents and policy makers are presented with both challenges and opportunities.  Challenges include increased public safety costs, increases in the number of nuisance properties and declining tax revenues from what are now "non-performing" properties.  Meanwhile, abandoned buildings and vacant properties can provide attractive residential, commercial and environmentally friendly reinvestment opportunities.