The median sales price in Brooklyn has been in decline for five consecutive quarters, according to Douglas Elliman’s Fourth Quarter Market Overview. The median figure dipped below $500,000 in the fourth quarter of 2008 for the first time since the first quarter of 2006. Average prices were down 5.2 percent from a year earlier and 2.8 percent from the prior three months. Perhaps more noteworthy, the number of transactions plummeted from 3,222 in the fourth quarter of 2007 to 1,846 last quarter; the rate of decline has been increasing for the past year. The only good news: The median sales price of brownstones in Northwest Brooklyn rose 12 percent; co-op prices were also up slightly. Update: This flu must really be going to our heads—as one commenter points out, these reports have been out for several weeks. The Manhattan 10-Year report is the new one. Oh well.