The other major issue is that commercial space has much different plumbing requirements than residential. Commercial plumbing is mostly centralized with low flo

The other major issue is that commercial space has much different plumbing requirements than residential. Commercial plumbing is mostly centralized with low flow pipes for sprinkler systems. That's not sufficient for residential space and it would take significant construction to add in that plumbing. Some commercial space will have similar issues with air conditioning and power. I'm often amazed when Big Brains trot out the "turn offices into residential!" without for a second wondering where people will shit.