A national real estate tracking firm said Greater Des Moines house prices increased 4.6 percent in the year ending in July. Excluding the sale of distressed properties, such as those owned by banks, prices increased 6 percent, CoreLogic Inc. said today. Nationally, prices increased 12.4 percent, including distressed properties. Prices increased the most in states including Arizona, California and Nevada that experienced the brunt of the housing crisis, CoreLogic said.