The Melbourne skyline will be distinctly more Manhattan-esque from 2018 when Collins House, one of the world's slimmest towers, is completed by Jeff Xu's Golden Age Group.

Construction will begin in March with prefabrication specialist Hickory Group appointed to build the 57-level glass and steel skyscraper, that will soar almost 200 metres above the Makers Mark building at 466 Collins Street, a 483-square-metre site that's just 12 metres wide.