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The Lubetkin Prize is awarded to an outstanding work of architecture outside the EU by an RIBA member. It is judged by the European and international jury.

DES MOINES PUBLIC LIBRARY, USA Architect: David Chipperfield Architects Architect of record: Herbert Lewis Kruse Blunck Architecture www. davidchipperfield. co. uk Client: Des Moines Public Library The building opened in April 2006. More than a repository for books, the library acts as a meeting place and community centre, providing a café and range of conference and educational spaces. The two-storey building is wrapped in an energyefficient glass and metal skin. A layer of copper mesh laminated between three glass surfaces reduces glare and solar gain, cutting energy costs. The mesh is the only sun-shading device necessary, ensuring that the view into the new Western Gateway Park is maintained.

Contract value $22.5 million (£11.3 million)

HEARST TOWER, NEW YORK, USA Architect: Foster + Partners www. fosterandpartners. com Client: Hearst Corporation The striking, 46-storey Hearst Tower establishes a creative architectural dialogue between the original Art Deco building and the elegant facetted form above. Its highly efficient structure uses 20 per cent less steel than its conventional counterpart and, with the use of 85 per cent recycled steel that consumes 26 percent less energy than its conventional neighbours, it is the first new office building in New York City to be given a gold rating under the LEED programme.

Contract value: Confidential

SOUTHERN CROSS STATION, MELBOURNE, AUSTRALIA Architect: Grimshaw (working within the Grimshaw Jackson Joint Venture) www. grimshaw-architects. com www. daryljackson. com. au Client: Leighton Contractors and Civic Nexus Grimshaw was appointed to work with local practice Jackson Architecture on the expansion of Southern Cross Station. The key design aims were practical performance, ease of circulation and an improved working environment.

The design focus is the dune-like roof covering an entire city block: it forms a visual bridge between the city centre and docklands, while uniting the interchange's elements.

The roof was developed in response to the hot climate as well as the need to extract diesel emissions.

Contract value: Confidential

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