so, you'll be paying off the interest on the HELOC with your own cash, and then hopefully the property will support the other loan. 

You cannot assume the loan under FHA with the intention to "rent" the home.

Equity will take time to build.By the time one has paid off the loan, the house would worth, say, 2 million dollars after 30 years.

It was a standard local realtor and lender deal for a first time home using an FHA loan.

I have tons of experience inspecial assets from inside of banks and I run a company that does, among other things, purchase non-performing loans and work them out (for all you that are trying to purchase them, we're not sitting on any right now...just saving you the question).

I can get a VA loan but again my debt to income with being on this house with my girlfriend and new car is making it hard for banks.

The buyer only pays interest so it's all straight profit while your underlying loan is amortized and reducing over time (another pillar of profit). 

Just make sure there is no restrictions to the extended stay model in your loan documents.

The best mortgage rate for your investment property that is available to the general public is going to be in the form of a conventional loan.

Hey @Alex Springer      What sort of loans are you seeking?