Bought Apt Building with hostile tenants in Los Angeles

[Jonathan A.]

Hi I just bought a 4 unit apt building near USC and all the tenants are giving me issues. They currently have no lease with old landlord and were paying $800 rent a month for a 1 bedroom. Each unit has over 5 people living in them and one unit there are 10 people living. I gave them notice that rent will increase to $1300 or they have an option to take $4000 for keys. All the tenants say they will take me to court. Any advise for Los Angeles?

Thank you