"Categorized as an Office Space"

We are proposing a new mixed use multi-story to be submitted under NC, v2009. The first floor will be cold dark shell space for future retail/restaurant tenants. "Temporary" electric unit heaters will be hard-wired into the shell spaces. Because these are tenant spaces, we don't think we can get away with calling this a Heat Only/System 10 space under requirements of Appendix dn G3.1.1 exception e. Because we don't know what the future occupancy will be, we're looking at Table G3.1 sec 1.c and seeing that "the space shall be categorized as an office space". 1) To categorize the shell as an office space, are we supposed to assign arbitrary/typical values for people and equipment in those spaces? Lighting would be prescriptive, per space-by-space method. 2) For purposes of Table G3.1 sec 10.c, would the Temporary unit heaters be considered a heating system? Or, would these be ignored and the "future" condition (electric / System 6) be used instead? Thanks for any perspective you can offer.