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For the second year in a row, the Federal Housing Administration is extending a temporary waiver of its “anti-flipping” rule, meaning homebuyers relying on FHA-insured financing will continue to be able to buy homes that have changed hands in the last 90 days.

The waiver is a boon for investors seeking to rehab and flip properties, because it expands the pool of eligible borrowers to include those relying on FHA-backed loans, popular with first-time homebuyers and others who lack the cash to make large down payments.

In extending the waiver through 2012, FHA said all transactions must continue to be arms-length. In cases in which the sales price of the property is 20 percent or more above the seller’s acquisition cost, the waiver will apply only if the lender can document the justification for the increase in value, FHA said.

FHA instituted the anti-flipping rule in 2003 to protect its mutual mortgage insurance program from losses on homes that were merely flipped, rather than rehabbed. Homes repossessed by Fannie Mae, Freddie Mac, and state- and federally chartered financial institutions were exempt from the rule.

In February 2010, the Obama administration waived the waiting period for resales — including homes purchased and rehabbed by private investors — in the hopes of stabilizing home prices and revitalizing communities hit by foreclosures.

It often takes less than 90 days to acquire, rehabilitate and sell properties, the Department of Housing and Urban Development said at the time. Some sellers of rehabbed properties had been reluctant to enter into contracts with FHA buyers because of the cost of holding a property for 90 days, HUD said.