Each thermal block discussed above may be subdivided into HVAC zones and the HVAC zones may be further subdivided into space uses. This section presents the building descriptors that relate to the space uses. Space uses and the defaults associated with them are listed in Appendix B. Every thermal block shall have at least one space, as defined in this section, when the space-by-space method is used. The spaces and space uses in the baseline building shall generally be the same as the rated building, except that when daylighting is modeled in the baseline building, the space in the baseline building may be divided into a daylighted portion and a non-daylighted portion.