Some buyers are getting the keys to their new home without putting a penny down.

It's 100% financing—the same strategy that pushed tons of homeowners into foreclosure over the past 5 years.

Banks say these loans are safer: They're almost exclusively being offered to wealthy clients with 'sizable assets', and they often require two forms of collateral—the house and a portion of the client's investment portfolio.

So, if a family buys a $2 million home, for example, they would get a $2 million loan, but they would have to pledge $500,000 in assets to cover the down payment.

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