Mapletree Investments has secured Merrill Lynch as the anchor tenant for its new office development, Mapletree Lighthouse, in HarbourFront.The entire building will house Merrill Lynch's third global IT and operations hub, after Dublin and Jacksonville, USA.Mapletree is also considering listing a mixed REIT towards the end of next year. Mapletree's latest addition to its HarbourFront complex is a 6-storey,...