I am working on a LEED certification for a new building that is attached via a small circulation bridge to an existing LEED-Certified building on a college campus. The new project crosses the boundary of the existing building and I'm unclear how to deal with this line crossing business?

I understand that each project needs to have a unique site boundary, but nowhere does it say what to do in the instance of building within an existing boundary. Does this require modifications to the LEED-certified bldg's documentation?

I believe these should be considered separate based on my reading of MPR2, which addresses the fact that sites can contain LEED-ineligible and -eligible bldgs, but does not mention certified bldgs. I'm assuming that's because they need unique boundaries. It also says "Buildings that have no physical connection or are physically connected only by circulation, parking, or mechanical/storage rooms are considered separate buildings and individual projects for LEED purposes", from which I assume that these can be considered separate and so must then have separate boundaries.

Additionally, I've reviewed the LEED Campus Guidance, which is difficult to understand as a newcomer, but it says "Both the LEED campus boundary and LEED project boundaries must comply with the Minimum Program Requirements and MPR Supplemental Guidance for the applicable rating system."

I still am unclear on how to resolve intersecting project boundaries though because it sounds like each requires an independent boundary. I think this may be covered by the shared sites for campus, but I am reluctant to pursue LEED Campus unless there are truly no other options.