New Buildings V1.2
Final Platinum

Overall Score
Site Aspects
Materials Aspects
Energy Use
Water Use
Indoor Enviro. Quality
Credit(s)    Innovations and Additions

Central Plaza Annex is located at 18 Harbour Road, Wan Chai. The Project is the vertical extension for 2 additional storey on top of the existing north-west podium level of Central Plaza Ancillary Block. The Project comprises of 3 levels with approximate lettable Grade A office area of 20,000 sq. ft., and 6,500 sq. ft. of sky podium and vegetated roof.  Adopting a consistent architectural expression with the existing Annex Building, in terms of materials and colour, the extension is a coherent, elegant addition to the podium portion of the main office tower, retaining the existing prestige and character of the Central Plaza. Central Plaza Annex will become a prominent sustainable landmark building in the district with double-Platinum certification under the BEAM Plus and LEED assessment.

Green Features

Materials Aspects

  • Adoption of low-emitting materials and regional construction materials to reduce building embodied carbon
  • Reuse of existing building structure and envelope to minimize C&D waste generation

Energy Use

  • High performance oil-free centrifugal chiller and VAV systems for space cooling
  • Triple glazed curtain wall system to allow plentiful of daylight and reduce solar heat gain, contributing to reduction of space cooling energy demand
  • Intelligent building management systems incorporating with the existing system for office tower to allow prompt and effective control on E&M systems to ensure occupant comfort and overall building energy efficiency

Site Aspects

  • Extensive green landscape provision in highly dense Central Business District

Water Use

  • Rainwater recycling system to reduce fresh water consumption for irrigation
  • High water use efficiency sanitary fitment

Indoor Environmental Quality

  • 30% addition fresh air supply for indoor environmental quality


Located at 18 Harbour Road, Wan Chai, Central Plaza completed in 1992 is the third tallest tower in the city and once the tallest building in Asia in mid 1990s. The unique triangularly-shaped skyscraper not only provided Grade A office space housing approximately 6,000 working population spanning across 78 storeys, but is also a masterpiece itself in representing Hong Kong and the exceptionally renowned Hong Kong Island skyline.

Central Plaza Annex is a 6-storey ancillary block extension located North West of the main building. Converted from a former executive clubhouse, the development is providing Grade A office area to prestige tenants. The original 4-storey building was redeveloped along with an addition of 2 storeys and a sky garden. 

Despite its scale, Central Plaza Annex goes beyond its site boundary to benefit the internal environment of Central Plaza complex and the external environment of the surroundings. The key is to strike a balance between retaining the essence of the existing main building and innovating design elements to present Central Plaza Annex as a contemporary ingenious building.

The constraints on the design in terms of the structure, materiality and etc. have challenged the design team to embrace the existing structure and turn them into opportunities.

In terms of the existing structure, the original structure and envelop were reused to minimize waste generation. Intelligent building management systems were also incorporated with the existing system of the main tower to allow effective control of E&M system.

In terms of the additional design input, in spite of being seemingly disadvantaged by its building height, the triangular floor plate was fully utilized to maximize the unobstructed view towards Victoria Harbour. A triple glazed curtain wall system that enhancing daylight intake while reducing solar heat gain was adopted to maximize energy efficiency. Window openings were also added to supplement the reduction of space cooling energy demand.

Central Plaza Annex has further strived to provide extensive green landscape of approximately 40% greenery in such a highly dense district. Plant species were carefully selected according to different environmental conditions. Central Plaza Annex takes the view that not only aesthetics is important, but also the living conditions of plant species for long term development. A total of over 12,000 flower pots were used in both floors with an assortment of plant species to enhance the spatial quality of the whole block.

The block made use of the space in-between 5th floor and main building to provide a small yet highly private space for tenants for work break. The incorporation of vertical green walls and a vast area designated for planters on roof created a care-free space for tenants to escape from the hustle and bustle and opportunities of holding different events in the lawn and open space such as seminars and other outdoor leisure sessions.

The combined effects of upgrading existing structures and incorporating inventive design principles were resulted from the continuous effort of Central Plaza Annex to provide a healthy and comfortable indoor and outdoor environment design for all.

Project Details

Completion Year 2019
Number of Blocks 1
Number of Storeys 5
Type Commercial

Project Team

Project Developer / Owner Cheer City Properties Limited and Protasan Limited
Project Manager DLN Architects Limited
Architect DLN Architects Limited
Landscape Architect Earthasia Limited
C&S Engineer Ove Arup & Partners Hong Kong Limited
Facade Consultant Meinhardt Facade Technology (H.K.) Ltd
Main Contractor Gammon Engineering & Construction Company Limited
Quantity Surveyor Rider Levett Bucknall Limited
Environmental Consultant Telemax Environmental and Energy Management Limited


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