I'm not a lawyer but I've worked as a Paralegal for 12 years and did alot of personal injury. Call a lawyer.

If it's the faller and they intend on suing, they need to get a lawyer. They in turn, will file suit against the city, as the sidewalk is public domain. If it's the business, I'm sure thy have a lawyer. I really don't think they'd have a case against the business. But again, that's my opinion and I'm not a lawyer.

Anyone else care to pipe in (ahem, Oh Johanna)