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Good news for single-family home investors, rehabbers and buyers seeking to use low down payment FHA financing: The temporary waiver of FHA's 90-day "anti-flipping" rule was extended last week through 2014.

The waiver, which facilitates purchases of homes from sellers who have held title to their properties for less than 90 days, continues a policy first adopted by the Obama administration in 2010.

Starting in 2003, FHA had imposed the 90-day standard as part of an effort to rein in rampant quick-flips of houses where investors made minimal or no improvements to rundown, foreclosed or abandoned houses, then sold them days or weeks later at high price markups with the help of inflated appraisals to purchasers using FHA loans.

Those flips frequently involved collusion and fraud by teams of mortgage loan officers, realty agents and appraisers -- even straw buyers who defaulted and disappeared without making a single payment -- and racked up significant losses to FHA's insurance fund. Neighborhoods suffered because the properties remained empty and in bad physical condition, depressing values of houses in the immediate vicinity.