Exception G3.1.1.c and zones with minimum air changes

Hello: I have a question related to exception G3.1.1.c which states that a separate single System 3 should be used for zones with pressurization relationships or minimum circulation rates. I have a 3 story mixed use healthcare facility with offices spaces, exam rooms, treatment rooms, research spaces, and a surgical and pre/post suite. My proposed system is chilled water and hot water VAV AHUs. My baseline system is System 5. 1. For the baseline I was intending to model a System 5 per floor and set the minimums to either 0.4 CFM/ft2 or whatever minimum air change rate is required by ASHRAE 170. I do not believe exception G3.1.1.c would be appropriate for this building because multiple zones (about 50%) have minimum circulation rates or pressurization requirements. Does this seem to be an appropriate interpretation of this exception? 2. On the first floor of my building I have a surgical and pre/post suite served by 2 different AHUs. The AHU serving the surgical suite has return terminal boxes on all of the zones whereas the AHU serving the pre/post suite does not have return terminal boxes. I was intending to model the surgical area as a separate System 5 (same zoning as proposed) and the rest of the floor as another System 5. Once again I'm not sure if this would be justifiable so any input is appreciated.