Residential real estate sales in Sarasota and Manatee counties dipped in January, even as median prices continued to rise, according to data released this week by the Realtor Association of Sarasota and Manatee. With 520 sales in January, Sarasota County experienced a slight 1.2 percent rise from last year in total sales for single family homes, while condo sales numbers decreased 5.2 percent, with 217 closed sales. In Manatee County, the number of single family home sales decreased 5.4 percent from last year, with 385 total sales, but condo sales rose 2.6 percent, with 156 closed sales. Single family median prices rose 21.3 percent in Sarasota County to $230,500, and climbed 10 percent to $274,900 in Manatee County. Condo prices were also up 17.8 percent in Sarasota County, at $218,000, compared to $169,950 for Manatee County, an increase of 6.3 percent over last year.