LOS ANGELES (MarketWatch) -- Chinese housing prices in the nation's largest cities maintained their upward trend in May, according to data out Tuesday from the National Bureau of Statistics. In its survey covering the 70 large and medium-sized urban centers, 65 showed gains for newly built homes during May, while 3 showed declines and 2 were flat. Compared to May 2012, all but one city showed a rise. Among prices for existing homes, 64 cities showed average gains, 3 showed declines and 3 were unchanged. Existing-home prices rose in 67 of the 70 cities compared to the year-earlier period. The gains offered mixed news for property shares, as they also make further policy moves to cool the real-estate market more likely. Among individual housing names, shares of China Vanke Co. rose 1% in Shenzhen, and Gemdale Corp. /zigman2/quotes/208026094/delayed CN:600383 -2.88% gained 1.7% in Shanghai, but stock in Agile Property Holdings Ltd. /zigman2/quotes/210448079/delayed HK:3383 -1.87% /zigman2/quotes/200754284/delayed AGPYY -34.62% dropped 1.7% in Hong Kong.