Regular building occupant definition

I may have yet another question that falls under the larger issue of vague occupant definitions, but I'm going to ask anyway. I have a client with very detailed reporting of employee transportation habits. The question we are attempting to clarify is the difference between FTEs and regular building occupants as it applies to the alternative transportation survey and reporting for this credit. If we use the definition of regular building occupants found in IEQc2.1 of having a permanent office or workstation and spending at least 10 hours per week in the facility, it seems the regular building occupants number is different than the FTE calculations. Some of the categories that we are unsure of include interns, staff employed by the developer that are outside the control of the tenant (i.e. security staff and building engineers), and contract employees that also cannot participate in the incentive programs offered by the tenant. Each of these categories is accounted for in the FTEs, but may negatively impact the transportation survey due to their unique employment parameters. Are they "regular" or not?