Greater Des Moines house prices increased 0.7 percent for the year ending in February, but declined 1.2 percent from January to February of this year, according to real estate analytics firm CoreLogic Inc. National house prices rose 12.2 percent during the one-year period and gained 0.8 percent from January to February. The national figures represent 24 months of consecutive year-over-year increases in home prices, CoreLogic said.