Sublease and Certificate of Occupancy
I recently looked at a property I'd like to move my business into.  One of the things I liked about the property is it gave my the opportunity to sublease a section to offset some of the costs.  When I looked at the building, I found the current owner, who is no longer occupying the property really, has already subleased about 70% of the building to two different tenants.  When I asked if they at certificates of occupancy, he said yes, but also seemed as if he didn't really know what he was agreeing to (he was the brother of the owner so he may or may not know exactly the situation).

So for my question: For subleased space, is it necessary to get a Certificate of Occupancy?  Would calling the town be the best way to find out if the two existing tenants are legal?
[{"id": "dnxrgox", "text": "Call the city planner. They're who decides what's okay and what isn't. ", "replies": [], "depth": 1}]