alt Hacker NewsThe answer to grandfathering things in is not to give them an indefinite examption from the rules; instead, give them, say, a 10 year period of exemption, giving the owner enough time to fix the defect and to spread the expense of doing so over time. It's not perfect, but eventually everything ends up being fixed.
It depends a lot on context. That's certainly a reasonable approach in some situations. However in this instance it's not clear to me that there's any possible way to comply with modern regulations. My impression is that in general it isn't permitted to keep massive tanks of hazardous industrial chemicals 500 feet from residential housing units in the middle of the city.
I think this is an example where it might have been reasonable for the taxpayers to foot a bill to facilitate their relocation 20 or 30 years ago.