As an owner occupant in Oakland I can give notice to the existing tenant (this would be difficult or impossible if you were just an investor) in the 3 bd unit and rent that to myself for market which is $4k (I pay $3.6k for a 3 bd 2 ba condo down the street with 2 parking spots in Oakland currently with my brother and this place is much larger and overall better location wise. $4k is conservative to be honest, place could probably go for $4.3k-4.5k.).

We also want to get copies of any leases of tenants, proof they have been paying, any Certificate of Occupancies, and also proof there is a security deposit. 

And no, a lender won't allow you to purchase a home under occupancy requirements if you intent to move into it at some point.

It focused in on markets that demonstrated high gross annual rental yields as well as areas marked by low owner-occupancy rates, which can signal a strong demand for rental properties.1. 

Hello BP members,I found 3 multifamily auction's around my house but i had only one week to bid, so I tried to find out everything possible which lead me to an older action  for all three and the starting bid was $1,000,000.so i set my goal to bid 15,000-18,000 per unit with more than 95% occupation and average rent price of $400, anyhow i didn't made the bid and they didn't sold them yet.my question is what next can make an offer to the broker?

If you are buying property that a govt. entity owns and is restricting purchase to owner/occupants then no you cannot because you are not buying it to hold for investment.  

Once it becomes available through FNMA, owner occupants will have the first crack at it

Hard money lenders tend to not like those deals as risk is higher versus 50 or 60% occupied with some cash flow to the stabilize closer to full occupancy over time. 

What are the buyer's plans for the property (e.g. owner occupant or investment property)? 

It's a great way to get owner occupant financing that is pretty straight forward.