Wow, I'm probably a little late on this one. Westmoore Group is a great company helping people get houses with not so good credit. However, it requires a maximum of 35% debt to income ratio and if you haven't been filing taxes here, chances are, you won't income qualify. Aside from that, they require a social security number. They are mostly used for owner occupied financing, not for investment purchases (as stated on their website - case by case basis).
Private Money Bank is a great source for financing loans for Foreign Nationals. Using the Federal TIN instead of a social security number helps make the process easier. The down payment of 35% can be carried by the seller as a seller held second mortgage. You will have to show proof of assets that you can carry the note (usually at 15%) for about 6 months. They charge up to 8 points in fees. I too, am signed up with them. They will lend up to 65% of the as is value or 80% of the sales price, whichever is less. They do not use ARV (After repair value) because ARV is very subjective and risky. A bank will be very cautious on lending money to repair a home if they believe that the buyer may default on the loan or run out of funds to repair the house.
I do have a lender in NY (not Westmoore) that will lend up to 70%. Even better is the fact that if you can negotiate the price down to 70% of the as-is value, the lender MAY not require a down payment at all. You would only have to pay the fees and closing costs at closing (fees cannot exceed 8% of the loan amount). Rates start at 9%.