I have a friend who decided to rent his primary residence after relocating for work.

Hi everyone - I'm looking at some 4BR SFH properties in the following zip codes: 900119003390031I'll be renting rooms out as either:Short-term rentals on AirBnBMonth-to-month rentals on AirBnBLeases - 6mos or 12mos via other channelsI'd like to live in one of the rooms and rent the others (the property will be my primary residence).  

No, you cannot get FHA loan for investment property it has to be your primary residence and it doesn't have to be your first loan.

Will a bank give me a 3.5% or 5% dp loan for a multi-family primary residence if I own these other properties? 

I'm obligated to have the duplex as my primary resident for 12 months, although from my understanding the only way to verify that would be the mail continuing to be mailed to that address. 

From what I can read in the tax code it seems possible with the homestead exemption here:This annual exemption is available for “residential property that is occupied by its owner or owners as his or their principal dwelling place, or that is a leasehold interest on which a single family residence is situated, which is occupied as a residence by a person who has an ownership interest therein, legal or equitable or as a lessee, and on which the person is liable for the payment of property taxes

Or a principal residence?

I really have no idea other than  to guess it's a little less than my own residence out here in California...

But you mentioned that the co-op is an investment property and not your primary residence so do you have some sort of permission to rent it indefinitely?

I believe for our situation (once it is not a primary residence) what they offer would be a small business type of loan.