I've also used traditional loans through regional banks and a few SBA loans. 

More doors the better if you are using an FHA type of loan.

I can only imagine that they got a bunch of big time investors and business loans to grow this out.

I have had several cases where I finally got cops or government officials to only do their job after being very loud to the newspapers, but it does work.  

You can get a normal owner occupied home loan to do this. 

For context, I will be assuming his VA loan at 5.1% and he will be doing seller financing for the remaining equity and sale price. 

You could get a loan from a local bank or private lender to fund it

Now my investor network as expanded and the best split I have experienced was 65/35 in my favor but I invested 40% of the cash and created over a million in imputed equity before any investor dollar was raised allowing me to originate a bank loan at 87% LTC.

If they have a good interest rate it might be worth looking to see if you could assume their loan to take advantage of the lower rate.  

Possibly using mortgage/home equity loan on one unit we own to buy an extra one.3.