My client is expanding an existing building onto an adjacent tract. Our LEED boundary is the interface between the new and existing buildings, extended across what was an existing parking lot. The project conforms to LEED requirement for LZ3 along the entire boundary with other owners, but, of course, across the parking lot we don't create a dark zone to satisfy LEED. The multiple building application guide doesn't offer too much help, although it does seem to say that we could demonstrate compliance around the entire site (old and new building and adjacent grounds). Someone suggested that I can set a LEED boundary through the parking lot that differs from the LEED boundary for other credits. This seems strange, and I would still have to 'turn off' the existing lights to find a boundary at which the new lights meet the trespass limit.