Home sales in the Des Moines-West Des Moines market are predicted to decline 10.5% in 2020, according to anational forecast issued by Realtor.com. The expected drop in the Des Moines-West Des Moines market is the largest decrease predicted by the group, which analyzed the 100 largest U.S. real estate markets. The decline in sales is being caused by tight inventories and the rise in mortgage rates, Realtor.com wrote in its report. Overall, the sale of existing houses is expected to drop 1.8% nationwide with inventory constrained mostly at the entry-level price segment, according to Realtor.com, which provides a comprehensive list of properties for sale.