Mainland-based property developer Coastal Realty Group is investing in infrastructure development that may involve buying assets from its unlisted sister company, chairman Chan Boon-teong says. The sister company - CTS-Coastal Investment - a joint venture with the mainland's largest travelling group China Travel Holdings and Hong Kong-listed subsidiary China Travel International Investment (Hong Kong) - invests mainly in mainland toll roads and toll bridges. Mr Chan said Coastal would expand into infrastructure to achieve a stable stream of recurring income. 'We're still identifying targets,' he said after the company's annual general meeting yesterday. Coastal, which builds and sells apartments in mainland cities, expected to see lower profit margins from property sales as competition heated up amid new housing policies, he said.