A sweeping two-hectare public park, complete with waterfront walkway and new pier, will be some of the final pieces of the $6 billion Barangaroo development that will link the northern reserve to the office towers at the south-west end.

It is the showcase of the project that the Barangaroo Delivery Authority, on behalf of the NSW government, says completes the design of Barangaroo South, as part of the authority's commitment to delivering more than half of the area as open public space.

The final stage will be at Barangaroo Central. The Renzo Piano apartments are in Barangaroo South between the Crown resort and Hickson Road.

It is one of the biggest urban developments undertaken by Lendlease in Sydney and already more than 15,000 people are working, living and visiting the area with three office towers, apartments and waterfront restaurants. Retailer David Jones has said its new, smaller-concept store is breaking initial sales expectations.