Instead of trying to fill up the “black hole” of vacancy, Urban Regeneration: Foresting Vacancy in Philadelphia envisions a different future for the city of Philadelphia — one that not only embraces, but expands vacancy. With the assistance of a proposed Philadelphia Land Bank, the system accumulates and transforms vacant property as well as under-used infrastructure into an adaptive and productive urban forest, not only increasing the biodiversity of the urban environment, but in the long run, also lowering maintenance costs and balancing the real estate market for the city.