Generally speaking there are 2 main types of loans for investors: “Conventional” and “Portfolio”Conventional - I'll define these as loans that come from Fannie Mae and Freddie Mac (if you recognize those names).

Nathaniel - the co-signer probably will need 5% down for a conventional loan in the future, but can qualify for another FHA loan at 3.5% down.

I also want to make sure I can get my own personal residence under a home owner occupied conventional loan. 

I'm looking for the holy grail of financing, and I'm wondering if this would work.If I were to purchase/ construct 4 homes on a single/ continuous lot, would I be able to finance them with a single conventional or VA loan? 

@Marshall Secord Most conventional banks require a 6 month seasoning period to be able to perform a refi, so you have to have your cash tied up for that time, with that comes a 30-yr fixed at around 3-4%.

Because I live there, I got a standard conventional conforming loan. 

Not all BRRRRS are bought with cash, so it is certainly part of the method.As Sean pointed out, you do have financing costs twice and if your method is to find heavy rehabs, some of which may not be financeable through conventional/FHA/VA loans, then you would need a hard or private money lender to fund those. 

I just bought a SFH in La Mesa and partnered up on a 5% down conventional loan purchase in which we are renting out the extra rooms to tenants (I am currently paying $400 for my mortgage payment).

I am trying to get financing for some multi family units but I'm having a problem with conventional financing due to my tax returns.

That said, the Conventional limits for any given area are what the lenders use as the VA limit.