If its impossible then they shouldn't build it. Simple as that.

You can't just put a barbecue pit in an apartment living room, burn down the building, and then throw up your arms and proclaim it was impossible to do safely so you're absolved of responsibility.

And let me be clear. I really don't mean to say regulation is enough. My point is that no matter the regulation the responsibility is theirs. If that bankrupts the company, so be it.