Real estate agents closed on 533 house sales in February, a 10.5 percent increase from January but a drop from February 2013, when 557 houses were sold, according to the Des Moines Area Association of Realtors. Pending sales increased to 809 last month from 783 in January and 769 a year ago. The number of active listings fell to 3,669, down 2 percent from January and a decline of nearly 4 percent from a year ago. The median sale price was $147,500, up from $143,000 last month. Houses sold in February were on the market an average 101 days. The association draws most of its data from Dallas, Polk and Warren counties.