The LEEDv4 Reference Guide stipulates "when additional properties owned by the same entity responsible for the LEED project are contiguous to the project site and have the same or higher lighting zone as the project, the lighting boundary MAY BE expanded to include those properties." (page 215)
Does this mean that it is left to the choice of the team and that the contiguous building can be EXCLUDED?
Our project is an addition to an existing building, and only this addition is pursuing LEEDv4-CS certification. There is no lighting master plan that is developed or anticipated for the site. Can we apply this credit only to the LEED project, and up to certain parts of the property line? How do we determine what parts of the property we can exclude?
The lighting boundary's sole purpose is where to measure spill light. It typically starts at the project boundary, but you can expand the lighting boundary to include all contiguous property with the same owner. This doesn't change the project boundary. It can only help you by moving the lighting boundary as far away as possible.
To avoid confusion on the submittal, only show lighting on the site plan that is within the project boundary. You don't need any sort of master plan for the whole campus. Nothing else exists for this credit submittal outside of the project boundary.