@Sam Abe
Hey Sam,
I hope you're doing well.
IMO there's a few things that will help in the future:
1.) Of course, better screening.
2.) Include in either the lease agreement or tenant's rules & regulations that there is absolutely no subletting or "guests" staying for more than 5 days.
3.) In CA, if someone needs to move/get out of the property, you have to, by law, within reason, to re-rent the property or accommodate them,
Example: We had roomates who had a falling out. They needed to move ASAP after 2 months into a year lease. We found a new renter; however, we secured them at $100 below previous tenants rent. We took the difference out of the previous tenants security deposit and everyone was happy.
4.) Quick question: These people just up & leaving your rental, are they generally college students?
5.) If you're renting to younger people have the OG renters sign a lease agreement. When one moves out, they will notify you. It is up to the remaining roommate to secure a new tenant. Once they find you, you will run a credit check on them and you will have the final say. You can ammend the lease and add them on as a roommate. The security deposit in your acct. will not be touched by you; however, that will be handled between the roomates.
6.) Sorry for rambling.
Message me if you would like to see the tenants rules and regulation we use.