KBS Realty Advisors LLC, a U.S.-based commercial real-estate firm, is planning to list some of its U.S. commercial real estate assets in Singapore and raise US$612 million, people with knowledge of the plans said. The company is looking to sell the units at 88 U.S. cents each, according to people familiar with the IPO process. It plans to start taking orders from institutional investors next week and list the real estate investment trust on the Singapore stock exchange by July 19.