Existing home sales in Las Vegas rose 57 percent in 2009, but builders sold fewer than half as many homes compared to 2008, according to statistics released Tuesday. SalesTraq reported that that demand for existing homes remained strong in December with the 4,502 sales the third highest-selling month in 2009, pushing the annual total to 48,075 – the third highest in the valley’s history. Median prices fell by $5,000 in December to $120,000.