LEED V3 2009 - PIf3 occupancy question

Working on a 5-story residence hall for university client. The top 4 floors are typical bedroom units, with typical support spaces such as study rooms, lounges, etc. On the lowest level, the Owner has not decided if they will build out as additional bedrooms and our current direction is to build out as shell space (to be determined). It could become something other than bedrooms, such as retail space for student use such as game room, yoga studio, coffee shop, etc. It could also become a combination of the two. We have no way of knowing at this point what will be built, so we have to move forward with the shell space as part of the construction and LEED. Do we just deduct the shelled area from the overall "new construction gross square footage" number that gets plugged into PIf2? And then, of course, assume zero occupants? Thanks.