The economic recession only lasted a year, but there wasn't a recovery for homes because prices had climbed much too high and builders had built way too many of them. Prices had to fall, not just back to a “normal” level, but to an even lower level so that the large inventory of excess homes could be moved – a sort of clearance sale. We're not yet done with that sale – see the large number of mortgages still delinquent – but enough has been cleared out so that prices can drift up to a more normal level.