The latest design from Rogers, Stirk, Harbour & Partners is C4, a 185 metre tall tower planned for the Australian city of Sydney that definitely has nothing to do with explosives, and instead refers to the plot number it would stand on.
The 185 metre tall, 42-storey proposal features typical design flares from the firm that virtually invented the architectural language of modern structural expressionism. The northern elevation contained external lift shafts running up the building with colourful yellow cross-bracing that overrun the roof level in a manner that is perhaps reminiscent of 88 Wood Street in London.
In a practical sense this means much of the vertical transportation on the tower can be put outside the typical floor freeing up space allowing for floors in excess of 2,384 square metres each meaning that the building and compete with other such towers in Sydney like Grosvenor Place. On the upper levels there are less elevators required, so the floors can expand slightly into the space that would be otherwise be taken by them further down the building.
On the southern side of the building too there is yellow structural crossbracing, that connects the building to the ground serving as a placemarker for the main lobby entrance. It then runs up the middle of the tower adding visual detail, and projects over the top of it working both to connect it with the other side of the building visually, as well as provide the roof with a distinctive peak that could be easily identified in amongst the busy Sydney skyline.
One more subtle effect on the building is the curved corners. These exist not for aesthetics but to provide a more aerodynamic shape that reduces wind loads on the main structure of the tower.
The tower element of C4 is also split horizontally into three main sections with recesses allowing plant levels, as well as greenery. On the east and west sides of all the office floors will be controllable louvres to help regulate solar penetration and shading.
C4 is being developed by Lend Lease, and currently being considered by Sydney's local government.