Per CA law, he must be given no less than 60 days written notice to vacate because he has lived on the property for a year or longer.
60 days is for OMI and op is not doing that.
"In units covered by rent control, this notice must state the grounds for eviction (just cause,), and that advice is available from the Rent Board. The legal process of eviction begins with a three, 30 or 60-day notice (some forms of subsidized housing such as Section 8 will use seven, 10 or 14-day notices"
OP mentioned LA housing, which tells me that she lives in the City of Los Angeles. That gives this guy a whole other list of requirements for eviction, because the City of Los Angeles is governed by the LA Rent Stabilization Ordinance (LARSO). Under the LARSO, you can't just evict for the heck of it. They only recognize 12 "just cause" reasons that can be used to evict a tenant. One specific provision is that as a resident manager, she can only evict him in order to replace him with a NEW resident manager [LAMC �151.09 A.8.b.].
Op stated," I also live on the premises and the tenants come to me occasionally also. So his managerial status is not even clear." I mostly had him on living for free because he is good at fixing everything.
Which makes it clear by op words, he is not an employee. In fact, op does not know what he is.
No income, no written agreement. He just reside there and does little fixing of things.
If you DON'T, then he DOES have the protection of the RSO, and you must follow the requirements of the RSO in order to legally evict him.
Which he does have the protection of and he can be evicted for one of the 14 reasons, not 12 as you stated.
Getting rid of the guy is going to prove much more difficult for you here.
Not really he needs for him to sign a lease or give him notice to vacate.
The only problem would be is that he may return wanting to get paid for his services. That why op needs to get a lawyer.