Buildings occupied by businesses or those for public use must be certified as safe to use by the local council.
If that hasn’t been done, how do you know those buttons on the elevator work? How do you know if there are enough fire escapes? How do you know the electrical systems aren’t going to shock someone? Or that the roof won’t cave in?
The answer is quite simple: You don’t… There’s no assurance at all and that leaves your business horribly exposed.