Total transformation of 1980s duplex penthouse results in attractive open-plan interiors and vastly improved layout

​​​​​​​Steel rods dipped in brass are suspended 7.3m to support the walnut treads in this apartment’s new light-filled stairwell. Walnut joinery at the base has a dual function – defining the stairs on one side and providing kitchen cabinetry on the other. Similarly, a display cabinet for the kitchen extends up into the stairwell.