The first move in the process will see the construction of the rugby union's administration office and training centre. A "game standard" training field and an associated half field would also be needed.
The Park Island Master Plan 2016 was adopted in April by the council's strategy and infrastructure committee, however some minor changes have been made - including a more "accurate" representation of the facility, and sport fields layout.
A paper before council - written by council director community services Antoinette Campbell - stated that since April, the HBRU had further developed its plans for the high-performance facility.
On the amended master plan, the half-training field would be on the corner of Orotu Drive and Westminster Ave, with the high-performance facility between this field and the full-sized playing field.
"This reconfiguration has resulted in nine less carparks to accommodate the HBRU facility footprint, which brings the net carparking change to a overall increase of 518 additional carparks across the entire Park Island sportsground," Ms Campbell stated.
HBRU chief executive Mike Bishop could not be reached yesterday.
The re-design of the hub - on a greenfields site - would mean a rezone of residential areas on the southeastern boundary to sports park zone through a district plan change.
This would also change much of the sports park zone in the northeast to residential.
There was no extra funding being sought to implement the master plan at this stage.
The Park Island Expansion has a budget of $4,246,000 in the next two financial years of the Long Term Plan 2015-25, and $7.5 million is earmarked for the financial years from 2022 to 2025.
The total rough order of cost of implementing the council-owned facilities in the Park Island Master Plan has been estimated to be $25,650,000 over 30 years.
