Counting existing trees on site towards open space

I typically use the square footage that the tree is planted in - like a 5x5 tree grate for instance would be 25sf. The only other option I could think of would be trying to argue that the tree canopy (as defined in SSc7.1) area might count, but that seems to be more in keeping with protecting and restoring habitat (SS5.1) than maximizing open space (SS5.2).

Ellen,
This is a concern for me also, our owner has agreed to a permanent easement on the property adjacent to and contiguous to the building. However a portion of the property is wooded and we intend to leave intact. So I'm confessed on the USGBC's definition of open area "This credit is intended to promote sites with large areas of vegetated open space that promote biodiversity and recreation—which can also add an amenity to your project, help with natural stormwater management, and mitigate the urban heat island effect" our area meets all the criteria except recreation, however this is an industrial park, not a park or school. I had discussed this in April last year w/ Tristan, "Complicated Open Space/Habitat Protection, LEED Boundary" My Civil engineer is concerned that a wooded area is not considered open space? Seems a wooded area would be more favorable for biodiversity and stormwater management than turf. What is your interpretation? Thanks

Hi Ken - I can't think of any reason your wooded area can't count as long as you can justify including it in your LEED boundary and the owner can confirm that the area will stay as open space for the life of the building.