Canary Wharf Group is fine-tuning its design for the top levels of the new Isle of Dogs Crossrail station at North Dock in London.
A focal point of the proposal, immediately north of Canary Wharf and said to be worth £500 million, is the park on the roof of shops and cafés.
Native plants and water features will encourage biodiversity, said a representative for the project. It will be open-air except for a timber lattice roof.
"The roof will be largely translucent or transparent to maximise natural light and minimise energy consumption."
Landscape architect Gillespies is working with world-famous architecture firm Foster + Partners on the scheme, with around 10,000sq m of shops.
The park and shops are not part of the Crossrail Bill currently before Parliament. A decision on a separate application before Tower Hamlets is due early next year.
Howard Dawber, strategic adviser at Canary Wharf Group, said: "Sustainability needs to be an integral part of the design and construction from the start. We are continuing to fine-tune the design to minimise impact on the environment."
- Crossrail is due to start on site in 2010 and the project will cost £16 billion. Trains should roll in 2017 from Maidenhead and Heathrow to the Isle of Dogs, Shenfield and Abbey Wood.