The idea is that the trusses to span the tracks will be high enough that between their lower extent (which has to clear the future electrical service over the tracks) and their upper extent (on which the deck can rest), there will be enough space to create a servicing and parking level. The space will be there anyway, and the buildings will have to be serviced, and as others have pointed out, zero parking for 2,500 units is not really possible yet, so… use that space between the trusses for parking.
42