Greenland Centre in Sydney, Australia, is a 68-storey apartment building comprised of a new 43-storey tower built upon an existing 25-storey building. The retention of the existing 1960s structure creates a dynamic composition on the skyline and has enabled the team to demonstrate an innovative approach to sustainable urban development. The extant steel frame is used as the basis for an enlarged structure, showing that an office building can readily be converted to an apartment building. The project acknowledges the typical Australian verandah, liberating unused balcony spaces from level 26 upwards (where strong wind buffering and pressure issues exist) by creating the 'Sydney verandah', a space defined by a single plate of glass suspended from above and propped out at floor level to create a visually unencumbered glass wall, enabling a sense of safe enclosure without the need for a handrail. In collaboration with the City of Sydney, the project also provides a range of public performance, recording and studio spaces.