The current railway station and the new underground station will be the nucleus of the new urban development of Stuttgart 21 and will create an interface between the old and the new city.

The Schlossgarten (palace gardens) remains the green heart of Stuttgart 21 and will only gain in importance as the city expands. Some of the currently existing rail yards will become a park. The historical station building will function as a loggia with its tower continuing to be a major landmark. The new station and the new urban district will give Stuttgart (S21) a new centre.

Via inhabitat.

http://youtu.be/zcNky1F4dAc