I had a studio in a office building for more than a year. I rented the office, had my kiln, pottery wheel and all the stuff I needed there. I only had 22 sq meters
Your kiln will not get remarkably hot at the bottom. My kiln was standing on a wooden pallet it did not even get warm.
My kiln vent was "connected" (it is not a airtight connection) to office ventilation duct and it caused zero problems.
Only problem you are going to have is dust on the floor -> footsteps in other areas of the office.