Home owners with mortgages as large as $729,750 in any area, not just high-cost areas, could see their interest rate temporarily cut to as low as 2 percent under the Obama administration's $75 billion foreclosure prevention plan.

The administration unveiled details of its plan, called the Housing Affordability and Stability Plan, this week, and analysts say there are a few positive surprises.

The $729,750 mortgage limit that would apply to homes in all markets, not just in high-cost areas, is an unexpected and helpful move, says John Courson, CEO of the Mortgage bankers Association.

"It will allow us to help more borrowers," he says.

Other details flesh out the main aspects of the plan:

• Eligibility for refinancing incentives is limited to home owners who are underwater by no more than 5 percent.

• Financial incentives apply only to home owners whose mortgage is a conforming loan backed either by Fannie Mae or Freddie Mac.

• Lenders participate voluntarily and can receive financial incentives for lowering borrowers' mortgage burden to no more than 31 percent of their household income. Borrowers can get a financial incentive to participate as well.

• Borrowers who are current can participate, but they must show approaching hardship that could derail their ability to meet payments in the future.