1. Preservation of land for outdoor recreation by, or the education of, the general public.
2. Protection of relatively natural habitat of fish and wildlife or plants, or a similar ecosystem.
3. Preservation of open space (including farmland and forest land) where such preservation will yield a significant public benefit and is for the scenic enjoyment of the general public or pursuant to a clearly delineated federal, state or local government conservation policy.
4. The preservation of an historically important land area or a certified historic structure.