Bungee jumping over Barangaroo and a tower offering unrivalled Sydney Harbour views are among the radical visions proffered by state government heritage experts to save a city landmark.

Heritage Minister Rob Stokes has asked Barangaroo authorities to consider the proposals to re-use the harbour control tower, a disputed, 87-metre tall former maritime structure slated for demolition to make way for a much-hyped park.

Source: Heritage Council of NSW Options Assessment Report (Tonkin Zulaikha Greer Architects).

The push to save the tower has triggered a stoush between the NSW Heritage Council and former prime minister Paul Keating who decried the concepts as an "absurdity".

Fairfax Media has obtained a consultant's report commissioned by the NSW Office of Environment and Heritage which suggests ways to retain the structure.