Question about liability related to existing tenant

[Dan Kennerson]

I'm looking at a 4 unit commercial building with long term tenants with good history.

Only concern, two of the 4 tenants live in the Units and also run a business out of them. They have been in the units for 6 and 11 years.

Property is in northern California.

What kind of liability or legal issues might I be facing by allowing them to stay and live in the units if I buy the property? The local real estate lawyers won't even return my call, which makes me think it's a hornets nest, but it's a good ROI so I'm still very curious.

Thanks!