Does anyone have first (or even second or third hand) experience with industrial sanctuary zoning or similar efforts to preserve industrial land from encroachment? Portland (OR) and Chicago are among well known urban examples. I would be particularly interested in regional approaches/discussions or examples from any scale places covered by growth management programs. In particular I'm looking for any comparative assessments of program elements or examples of code defining industrial use with any degree of specificity (e.g. traded versus non-traded sector industries).