LEED NCv3 Project Boundary in 3 Dimensions

Hello, I am reposting this question, hoping to get a response. It was under PIf2, but maybe this is the better area to post it. I am working on a new building being added to an existing corporate campus. The project includes a new building and a new skyway connection to an existing building. Under the skyway, very minimal work will be done. It will be limited to that required to support the structure. The skyway is being included within the LPB, but the LPB won't go to the ground in this area. It is my understanding that LPB's can work in three dimensions. When calculating the "total site area within the project boundary," therefore, I am inclined to exclude the square footage of the skyway. Or only include the square footage being disturbed to support the skyway. Does this seem like a logical approach? Thanks in advance