"Banks have ramped up short sale approvals," said Duane Legate of House Buyer Network, which connects short sellers with buyers. "They're hiring a lot of the people who once worked in the mortgage-lending industry and moved them over to short sales."

These transactions, where lenders allow homeowners to sell their houses for less than they owe, accounted for 17% of all residential real estate sales in February, up from nearly 13% in November, according to a monthly real estate market survey by Campbell/Inside Mortgage Finance.

And Bank of America, the country's largest mortgage servicer, has more than doubled the number of short sales it processed in recent months.

Elizabeth Weintraub, a Sacramento, Calif.-area real estate agent who handles many short sales, was amazed at how quickly a recent deal went through. "Bank of America approved it in 24 days," she said. "That flipped me out."

This is a huge change from even just six months ago when the short-sale market was stalled and most people would describe the process has real estate hell. Because lenders stand to lose so much on these transactions, they have been reluctant to make short sales happen, often waiting months before getting back to potential buyers.