The Riverdale section of the Bronx includes the neighborhoods of Fieldston, Hudson Hill, North Riverdale, and Spuyten Duyvil. Median sales price rose 20.8% to $320,000, the third consecutive year over year increase. For the year, the median sales price was up 11.6% from 2017. Like most of the metro area, the number of sales slowed from yearago levels. There were 124 sales in the final quarter of 2018, down 23% from the same period last year and year to date sales were down 5.6% from 2017…