It would be helpful to know what kind of construction it will be, however, I am familiar with most types of construction techniques and materials.
I have designed for cmu, solid concrete, icf, wood frame, post and beam, log, metal framing, steel and combinations of them all.
Seperate occupancies are not an issue, we would just need to utilize UL specs for separation (if there is no difference in occupancy type) If there is a difference in occupancy types, there are a few other considerations.