Generally speaking, non-resident alient financing might be considered by an alternative credit lender. They typically required at least a 30% down payment to be considered for a "stated income" loan. The interest rate charged was substantially higher than a conventinal loan.
Many of these alternative credit lenders are no longer in business and the global credit crunch is making it more challenging for everyone to qualify for a loan.
You may get a more current situation response on the mortgage forum:
//www.city-data.com/forum/mortgages/