Home prices, including distressed sales, declined by 0.7 percent in May in Greater Des Moines compared with May 2011 after rising 0.3 percent in April, real estate research firm CoreLogic Inc. said today. Excluding distressed sales, year-over-year prices declined by 0.3 percent in May and increased by 0.9 percent in April. Nationwide, prices increased 2 percent in May on a year-over-year basis.