The number of houses sold last month in Greater Des Moines dropped to 1,172 from 1,194 in June but was up 7.5 percent from a year ago, according to a report today from the Des Moines Area Association of Realtors. Pending sales declined to 1,081 from 1,144 in June and 1,141 in July 2013. The median sales price held steady month-to-month at $175,000. The Realtors association pointed out that houses were on the market for 75 days last month, down from 79 in June and 83 a year ago.