Commercial Bay (skyscraper)

For the waterfront feature, see Commercial Bay.

PwC Tower at Commercial Bay
Map
General information
StatusCompleted
TypeMixed-use Office Tower and Retail
Architectural styleModern
LocationAuckland, New Zealand
Coordinates36°50′39″S 174°45′57″E / 36.8441203°S 174.7659219°E / -36.8441203; 174.7659219
Groundbreaking2016
Estimated completionMarch 2020 [1]
CostNZD $1 billion+
Height180.1 m (590.9 ft)
Technical details
Floor count41 (36 Leasable, 2 Mechanical, 1 Meeting Suites, SkyLobby)
Floor area39,000 m2 (419,790 sq ft) Office 18,000 m2 (193,750 sq ft) Retail
Design and construction
Architect(s)Woods Bagot in association with Warren & Mahoney
DeveloperPrecinct Properties
Structural engineerHolmes Consulting LP[2]
Website
www.commercialbay.co.nz
References
[3][4][5]

PwC Tower at Commercial Bay is a mixed-use office tower and retail development in Auckland, New Zealand, completed and officially opened on 27 July 2020.

The development consists of a 41-floor office tower with leasable floors, three mechanical floors, one floor reserved for meeting suites/pods, and a SkyLobby,[6] and a retail precinct with 18,000 m2 (190,000 sq ft) of retail space, replacing the Westfield Group Downtown Shopping Centre, which was previously located on the site.[7]

Rising 180.1 metres (591 ft), the PwC tower is the currently tallest building in New Zealand and the second tallest structure in Auckland behind the Sky Tower.[8]

Project timeline and construction delays

Construction on site began in mid-2016 with the demolition of the Downtown Shopping Centre.[9] The retail development was originally scheduled to open in October 2018, followed by the office tower in June 2019.[10]

Fletcher Construction, responsible for the overall construction of the development,[11] posted massive financial losses in 2017 due to rising costs in construction.[12] And as Fletcher Construction began to downsize its operational capabilities, the project was subsequently delayed due to numerous extension and additional cost claims to Precinct Properties,[13] with the retail centre to be completed in March 2020 and the office tower to be completed in April 2020.

The building was officially topped out in June 2019.[14]

The retail centre was originally scheduled to be officially opened on 28 March 2020, but just days before a nationwide coronavirus pandemic lockdown was announced[15][16] and a new opening date was set for June 2020. On 11 June 2020, the development was officially opened by Prime Minister Jacinda Ardern.[17]

Design

PWC Tower

The design brief for the Commercial Bay project team was to deliver an urban experience that reflects Auckland’s position in the world as a place of cultural richness, desirability, and relevance.[18]

Architectural design

Warren & Mahoney are the lead architectural designers, partnering with Woods Bagot and NH Architecture.[19]

Philosophy

The development was to represent the "maturation of Auckland as the 'Capital of the Pacific'",[19] a destination for retail, food, entertainment, and commerce, a new symbol of the city's emergent confidence. The development concept was considered as a comprehensive, site wide precinct development (a "Retail Precinct", and "Tower Precinct").[18]

Structural design

Holmes Consulting, an industry-leading structural engineering consultancy firm provided the structural design and consultancy services to the entire development[20] (for both the retail complex and the office tower).

Complexities

One of the major design complexities of the development was to accommodate the new City Rail Link tunnels running underneath the basement of the office tower to the Britomart Train Station.[21]

The main challenge when designing the basement came from the requirement that it needed to be stepped to accommodate the CRL tunnels. There are three levels on one side of the site and one level on the other, followed by the curved tunnels running through the middle of the site.

The alignment of the tunnels had been set before the design of the office tower, and it was decided that the best way to proceed was to build the foundations of the office tower into a cavern-like structure within the development. It meant the tunnels could be completely structurally isolated from the rest of the building.

In addition, the ground conditions also varied across the site with rock encountered at four metres (13 ft) depth at one corner and up to ten metres (33 ft) at the other end, which required a range of retaining solutions to be developed around the perimeter. There were water ingress issues to be considered as the bottom of the basement is well below sea level.

Due to the location of the tunnels, some of the tower columns are unable to reach the ground.

A "transfer gymnastics" was developed for loads to transfer across the top of the tunnels so that they don't upset the alignment. The columns were also unable to be supported by the tunnels as this would have risked vibration transmission therefore by integrating the tunnel alignments with the position of the tower and the basement ramp contributed to a very sophisticated design for the base portion of the tower.[22]  

Floor configurations

All levels are configured as a side core floor plate design, where the central lift core shaft is removed from the center of the floor plates (as typical with all office buildings) to the external face of the building. This allows significant space gain of the entire floor, allowing tenants full flexibility on how to use 1,350 m2 (14,500 sq ft) of their entire floor space.[19][23]

Environmental

The office tower is New Zealand's most sustainable high-rise office building and currently holds a 5 Star Green Building and Green Star Design Rating[24] High-performance glazing was specified to include a ceramic frit below the low-E coating – a sophisticated process only available from two glass manufacturers globally at the time of construction.[25]

Major tenants

The anchor tenant of the office tower is PricewaterhouseCoopers, with about 900 staff taking up to six floors. Other major tenants include Jarden, MinterEllisonRuddWatts, Chapman Tripp, DLA Piper.[6]

See also

References

  1. ^ "$1b Commercial Bay delayed even further: No shops, offices till next year". NZ Herald. 28 May 2019.
  2. ^ "Commercial Bay".
  3. ^ "PWC Tower". The Skyscraper Center. Council on Tall Buildings and Urban Habitat. Retrieved 3 March 2020.
  4. ^ "PWC Tower at Commercial Bay". skyscraperpage.com. SkyscraperPage. Retrieved 3 March 2020.
  5. ^ "PWC Tower at Commercial Bay". Emporis. Archived from the original on 3 March 2020. Retrieved 3 March 2020.
  6. ^ a b "Commercial Bay - Tenants". Archived from the original on 13 May 2021.
  7. ^ "Downtown Shopping Centre demolished to make way for Commercial Bay". www.commercialbay.co.nz.
  8. ^ "Auckland - The Skyscraper Center". www.skyscrapercenter.com. Retrieved 20 March 2021.
  9. ^ "Downtown Shopping Centre Demolished". 25 May 2016. Archived from the original on 9 November 2016.
  10. ^ "NZ Herald". Archived from the original on 23 November 2020.
  11. ^ "Fletcher Construction - Commercial Bay". Archived from the original on 26 January 2017.
  12. ^ "Fletcher Building lost nearly a billion dollar in last two years". Archived from the original on 28 January 2021.
  13. ^ "Commercial Bay delayed further". Archived from the original on 23 November 2020.
  14. ^ "Commercial Bay tower topped off". Archived from the original on 1 December 2020.
  15. ^ "NZ moves to alert level 4". Archived from the original on 23 March 2020.
  16. ^ "Commercial Bay announces new opening date after Covid-19 delay". 29 May 2020. Archived from the original on 7 June 2020.
  17. ^ "Auckland's $1b Commercial Bay shopping precinct opened by PM". Stuff. 11 June 2020. Retrieved 14 June 2020.
  18. ^ a b "Design case study - Commercial Bay". Archived from the original on 6 February 2018.
  19. ^ a b c "Warren and Mahoney portfolio". Archived from the original on 12 August 2018.
  20. ^ "Holmes Consulting - Commercial Bay". Archived from the original on 3 December 2020.
  21. ^ "CRL tunnels underneath Commercial Bay". Archived from the original on 23 January 2018.
  22. ^ "ACENZ - what's under the Commercial Bay tower". Archived from the original on 26 September 2020.
  23. ^ "Precinct - Commercial Bay Leasing". Archived from the original on 25 January 2019.
  24. ^ "NZGBC - Commercial Bay". Archived from the original on 19 February 2020.
  25. ^ "Architecture Now NZ - Commercial Bay". Archived from the original on 26 September 2020.

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