Option 1: Zoning and controls

Hi, The project is basically a huge sales area with some office spaces.The sales area is served by multiple compact rooftop units and the office areas are served by DOA´s for ventilation purposes and by VRF's or split systems to maintain thermal comfort. 1) Is the sales area a specialty use space? If so, having CO2 sensors in the return ducts and abbility to modulate OA enough? 2) Are locker / dressing rooms specialty use spaces? If so, am I to consider them densely occupied spaces? 3) In the office spaces (served by the 100% OA units and the VRF or split interior units) is it enough that the occupancy sensor shuts the coils off when spaces are unoccupied rather than maintaining a set-back temperature control? (note that all rooms have occupancy sensors paired with thermal sensor). In thes case the 100% OA units would not vary air volume. Thank you in advance!