** Shares of Chinese property developer Seazen Group 1030.HK rise 10% to HK$2.3, their highest levels since March 19
** Stock on track for a sixth straight session of gains and set for the biggest one-day pct rise since April 9, if current trend holds
** Seazen stock is top percentage gainer in the index tracking property and construction stocks .HSCIPC, which rose 1.2%
** Co says its contracted sales in May amounted to 1.97 billion yuan ($274.21 million), compared with 1.75 bln yuan contracted sales in April
** Hang Seng Mainland Properties Index .HSMPI surges 2.3%, Hang Seng Index .HSI gains 0.3%
** YTD, stock up 24.7%
($1 = 7.1844 Chinese yuan)
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))