There was a cool OddLots episode recently where they talked to a guy who does Office to Residential work and some of the complexity. One thing he talked about, which I didn't know anyone did, was to actually cut through the ceiling/floorplate of buildings to basically "donut" them. This is necessary because many office floorplans are huge with modern HVAC and when converted into residential you end up with either und…
Add a few light pipes out to the outside walls and you can even get a bit of outside light inside!