Brownfield

Brownfield is previously developed land that has been abandoned or left underused, and which may carry pollution or a risk of pollution from previous industrial use. The definition varies and is decided by policy makers and land developers within different countries. The main difference in definitions of whether a piece of land is considered a brownfield or not depends on the presence or absence of pollution. Overall, brownfield land is a site previously developed for industrial or commercial purposes and thus requires further development before reuse.

Wikipedia →