BEIJING, September 28 (TMTPost) – Hui Ka Yan, Chinese real estate tycoon and the chairman of Hong Kong-listed property developer China Evergrande, was under “residential surveillance” due to his suspected involvement in illegal activities, according to an announcement by the company. The company's shares were suspended from trading on Friday. The suspension will continue till future notice. Hui's company has been trouble for years amid the ailing housing market..