From a theme point of view it fits the CI better. NC has many aspects associated with what goes on outside the building, on the roof, hardscapes, stormwater, etc. CI is aimed at people who don't have much influence over things like if the roof is painted white and the hardscape is pourous. If CS was used when the building was built and assumed the tenant would build out his own HVAC distributions, then CI would be the perfect follow up. How much of the existing HVAC will be used?