DUO is located at a strategic site within the Ophir-Rochor belt, identified as a new growth area by the Urban Redevelopment Authority, one that marks a nexus between commercial and historical districts in Singapore. The project therefore took the opportunity to create two towers that synergetically embrace not only each other but also their diverse surroundings. Public realms are carved out of the zoning envelope; the resulting curves create generous outdoor public spaces and dynamic street façades. Dramatic cantilevers and generous roof terraces create a distinct new skyline. The curved façades are veiled by hexagonal sun-shading, while the flat faces are articulated by vertical fins that emphasise the towers’ vertical elegance. Natural landscaping on multiple levels provides a lush tropical environment. The development also incorporates environmental strategies: the building’s orientation is optimised to prevailing sun and wind angles; the curved building massing channels winds through and across the site; efficient air-conditioning, rainwater harvesting and irrigation, as well as energy and water-efficient fittings are incorporated into the building design.