Greater Des Moines house prices increased 2.7 percent in April from March and increased the same amount from a year ago, real estate analytics firm CoreLogic Inc. said. Nationally, prices increased 10.5 percent over the year and 2.1 percent March to April. Colorado, Louisiana, Nebraska, Oklahoma, North Dakota, South Dakota, Texas and Wyoming all surpassed their previous home price peaks. In all, 23 states and the District of Columbia are at or within 10 percent of their peak home price appreciation.