According to Frank Nothaft, vice president and chief economist, Freddie Mac: 

"Mortgage rates eased somewhat as the consumer price index in February held steady for the second month in a row. House price indicators, however, showed gains in 2012. The S&P/Case-Shiller® national home price index rose 7.3 percent last year, reflecting the largest four-quarter growth since the third quarter of 2006. This, in part, was a driving force that pushed up the number of existing and new home sales in February to the highest levels since July 2007 and July 2008, respectively."