One percent of all Iowa mortgages were in foreclosure at the end of May, a drop of nearly 1 percent from the same time last year, real estate analytics firm CoreLogic Inc. said today. The state's lenders completed fewer foreclosures over the one-year period, following a national trend in which the rate of completed foreclosures has fallen as real estate markets have improved. Completed foreclosures have dropped 9.4 percent on the national level.