The Government's Central Christchurch Development Unit hopes to complete by 2014 the parks and cycleways along the Avon River that run through the city centre.
On Thursday it called for expressions of interest in designing and managing the work, which includes roading and flood protection.
Interest is also being sought for work on the area of green space set aside immediately to the north of the city centre and part of the eastern section of the CBD where a children's playground is to be built.
A short list will be drawn up out of those wanting to carry out the work, with tenders then being invited for the work.
Expressions of interest will also be sought from those wanting to design and build a convention centre and a metro sports centre.