Consultants are being invited to tender now for the job — which will form part of the Transforming Tate Modern project.
The project is seeing the creation of a new extension on the south side of the gallery, two new public squares, pavement cafés and a new urban park.
More than 1,350 new trees will also be planted in the gallery area and new seating provided.
A Tate Modern representative said: “The new building will facilitate the greater integration of the Tate with its local community and urban landscape, and act as a catalyst for the further regeneration of Southwark.”
The park will aim to connect the new landscaped areas around the gallery to other open spaces along the London’s South Bank — an area that is gradually being rejunivated.
The landscape consultant appointed for the job will work with the architecture firm Herzog & de Meuron, which has drawn up the current plans after being appointed to draw up the original Tate Modern design nearly 10 years ago. The original design saw the conversion of the Bankside Powerstation into a gallery and was built to accommodate just 1.8m visitors a year.
This was an underestimation as the gallery now gets more than double that amount. The new building will therefore provide more space for visitors to better explore the museum and room for larger-scale works and installations.
Planning permission was granted by Southwark Council in March.
Work will start in December and is due to finish at the end of 2011, in time for the 2012 Olympic Games in London.
* Interested parties should contact John Millen on firstname.lastname@example.org before 30 August.
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