I'm currently working to rehab and add value to a duplex in SF, and then hoping to use that equity created to fund more REI.

I rolled all those funds into another flip I working on now which also came from a realtor and estimating a 30k profit. 

I know that the "traditional" way of doing real estate is to charge a commission and go about business, but many people who are limited on funds when selling their home need a few options.

In either case, does it make sense that someone would fund them 100% or even 90% for that matter. 

Credit Karma will let you get an approximation of what your credit score is.If you're looking to buy a property and can pay 10-20% of the loan as a down payment, then the lender will usually fund the rest.

I talked to a family friend and he is willing to fund my investment.

@Craig Curelop, what @Chris Jackson pulled off is pretty cool.Another option is to borrow the funds, secured by some other piece of real estate.

2) Would I be able to use a 203 for funding, then split the properties after the fact, assuming I'd stay in one of the townhouses for at least a year?

The home could later be used for the equity to purchase more property or sold and the funds used to purchase more homes.

The 50-70k 4 units you may find may not be in the most desireable area to live in.