As far as I understand you can only use an owner-move-in eviction on one unit in the building. So you can only OMI one tenant (read one unit in the building). Also, if you ever need to do it again, then you'd have to move back in to the exact same unit. You could not move into other units in the building after you've moved out and later come back... say... 10 years later. Or 10 minutes later, for that matter.
You cannot sell the place before 3 years are up, or the tenants you evicted would have a reasonable chance of winning a law suit that they bring against you. If the circumstances of the sale were out of your control, you'd have a good chance of winning the suit, but you'd still be paying for a lawyer to go to court for you (so you'd lose money anyway). Tenants are usually familiar with the neihbors, and those neighbors will be watching you for 3 years. It's not that hard to get caught if you leave before 3 years.
About family members... That's right... there is a such thing as an RMI (relative move in eviction). But, that relative has to be your parents or your kids. For some reason brothers/sisters and extended family do not count for an acceptable RMI.
I talked to a lawyer bout this, and it is possible to take down 2 units. 1 via OMI and the other via RMI. But it's risky. You're trying to avoid getting sued, and tenants essentially have free legal help from organizations like Causa Justa, and Oakland Tenants Union. They have law school students and lawyers who just passed the bar at these organizations that are willing to represent tenants through a full case FOR FREE.
The tenant's lawyers will strategically take a case through the longest possible course to resolution. Part of the strategy is to stop paying the landlord rent during the legal issues, get a relocation payment for the tenant, negotiate for more time for the tenant so they can find a place to move to, and increase the fees the landlord has to pay a lawyer to go through the legal process.
Keep in mind this is FREE legal representation for the tenant. Landlords have no source of FREE legal help. So yes, it's possible to get 2 units. But would you really want to risk it?
Here's how you lose money:
- months of unpaid rent
- additional time for the tenant to find a place to move (and more unpaid rent)
- paying a lawyer to read documents and go to court (while the tenant does not pay)
- Relocation payments/buyouts/cash for keys
I don't think it's worth the risk.
It's easier to do things straight up. Buy the place, move in with the honest intent to live there. Raise the rent to market rate after 2 years. Live there a total of 3 years, and then do what you want (rinse & repeat).
It's also possible to skip all the BS and use straight up cash for keys. Offering tenants 7K to 10K is what I hear it takes to get them to move in East Oakland.