By mglover@sacbee.com (Mark Glover) Amid an improving housing market nationwide, the Sacramento area led the nation in year-over-year percentage median sales price growth at the close of 2013 and the beginning of 2014, according to Emeryville-based ZIPRealty Inc. ZIPRealty said the area’s median home sales price in December was $248,500, up nearly 31 percent from $190,000 in December 2012. …read more