The metropolitan government lias developed the Buildable Lands Inventory, a detailed and sophisticated land-monitoring process to inventory vacant land and track the “refill rate”. This is defined as the rate at which new development occurs through "infill” (when more units are constructed on an already developed lot) or “redevelopment” (when a structure is removed and another built in its place). For nonindustrial use, 52% of new capacity was built on developed land (Metro, 2009).