I am working on a building for LEED Certification - it is one of several buildings on campus (the others are not going for LEED status at this time). The site's parking areas are more than 50% exposed (less than 50% underground, covered, etc.) The walkways around the building are concrete and other walks on campus are asphalt. There is a parking structure adjacent to the building that is concrete and the rmeaining on-site parking is asphalt - but the parking serves multiple buildings - so, how does one determine this point/credit for an EBOM path while concentrating on only this building on the entire campus? What is the limit/extent of distance that we can go to that would allow us to count the walkways around and adjacent to the building as concrete?