Dick Hubbard's grand plan for Auckland's Aotea Square is being described as uplifting - as long as he does not expect ratepayers to bear all the costs.

The city's mayor has been working with local big thinkers on a proposal for not only fixing, but transforming the square.

Ideas being bandied around include a road under the square, relocating the library there and a grand verandah.

Central Auckland retailers group Heart of the City says the council needs to create an in-depth proposal which attracts national funding.

It says Auckland cannot afford the vision alone.