When does a tenant establish rights in Los Angeles?

[Lucas Allmon]

I’m possibly buying a house where the one owner might stay on as a tenant one of the units. I want to offer first right of refusal on a lease, but I also want to make sure that they would not be able to establish residency.

He mentioned something like needing 30 (maybe 45) days after close of escrow to “find a new place”, but it comes across as a way to establish tenants rights in my view.

I thought I might suggest offering a lease, with the first month free, that way if he breaks it, I can file formal eviction that isn’t a “no fault” level eviction.

What are your suggestions/input?