Buying triplex with tenants, unsafe units.....

[Dmitriy Filippov]

Hello, I am a new here, I am purchasing a triplex with current tenants that has been there for decades, after inspection we found out that the units are not safe to stay with many major issues, roof leaks, subfloor in bathrooms very soft, electrical panels that has been recalled decades ago and many other..... please let me know from your experience what is a shortage time frame I can remove tenants, or if they stay with standard 90 day notice how could I avoid the liability in case something happens. 

please advise..... thank you