Hong Kong's Hang Seng Index posted modest gains on Wednesday as investors upheld optimism about Chinese economic growth amid news about German investor confidence. Hang Seng index added 0.3% or 59.17 points and settled at 19,686.92. Property share rallied in Hong Kong as China Overseas Land & Investment Ltd. advanced 1.4% and Sino Land Co. jumped 1.7%. On the downside Agricultural Bank of China Ltd. edged down 1.59%.