Hong Kong

Over several decades of designing together, Tod Williams and Billie Tsien have steadfastly emphasized the serene and assured manipulation of spaces, planes, and materials, and exhibited an impeccable sense of craft. In addition, they have cannily united large- and small-scale architectural elements into integrated compositions, as seen in their new Barnes Foundation in Philadelphia and 'now possibly threatened with demolition' their Folk Art Museum in New York City. But in their design for the Asia Society Hong Kong Center, completed in 2012, they took on even more challenges. Their scheme shows the firm's prowess at blending architecture into the landscape while balancing new construction with renovated historic structures.

Immersed in the lush hills of the Admiralty area of Hong Kong Island, the Asia Society's new 65,000-square-foot center occupies more than 3 acres of rainforest that had been the Explosives Magazine Compound for the British Army. There, between 1860 and 1907, the colonial rulers had created two ammunition-storage facilities and a munitions lab at the top of the steep site, with earth berms positioned between them in case of explosions. A fourth building, named GG Block, was constructed in the 1940s on the lower part of the hill for the Royal Military Police. By the 1980s the ammunitions complex had been abandoned, and in 1999 the Hong Kong branch of the Asia Society succeeded in leasing the property from the city'which by then had been transferred from British to Chinese rule.

The society, founded in New York in 1956 to foster cultural and business interaction between America and Asia, obtained major funding from the Hong Kong Jockey Club Charities Trust to create a satellite home in this burgeoning metropolis. Its program called for salvaging the munitions buildings on the upper site, in accordance with the recommendation by a landmarks advisory board, although the structures were in a sorry state of disrepair. In addition to making use of 17,000 square feet of these existing spaces for cultural facilities and offices, the society needed a new building for visitors' orientation, dining, and meetings.

In its winning scheme for the invited competition, Tod Williams Billie Tsien Architects (TWBTA) placed a new 10,170-square-foot main pavilion next to the GG Block, now renovated for offices. The architects then linked this lower portion of the slope to the three existing structures at the top by creating a two-level concrete bridge, reminiscent of Hong Kong's own elevated walkways. Instead of busy streets, this pedestrian path on Y-shaped supports angles over, around, and through the lush growth to avoid harming fruit bats in the palm trees.

Ultimately the walkway deposits you at the renovated cluster from another era: the former lab from the 1860s, now used for conferences; next, Magazine A, built in 1868 and transformed into a gallery; and finally Magazine B, built in 1907, which the architects converted to a 100-seat theater.

Hong Kong preservation architect Ivan C.C. Ho guided the firm in the finer points of rebuilding the red-tile roofs and reproducing teak doors, window frames, rafters, beams, and joists, as well as restoring masonry- and granite-walled structures. TWBTA's interventions are discreet and minimal'such as the elegant glass-and-steel entrance to the gallery'and accommodate new uses without irreversible changes to the old structures. It helped that the firm put mechanical equipment underground in the western part of the upper site.

In visiting the center you arrive at the lower site, first passing the GG Block, and then move on to the new main pavilion, a two-level, poured-in-place-concrete structure. There, a grandly proportioned plaza sheathed in a strikingly striated Chinese marble announces the entrance. Beyond the cream-colored and gray stone surfaces of the lobby, you find the majestic Jockey Club Hall. This rectangular multipurpose room seems to float out into the vines and trees, owing to laminated-glass curtain walls, 17 feet high and 110 feet long, on the east and west elevations. Downstairs is the shop and AMMO, a brashly gleaming restaurant designed by Joyce Wang of Wang Design in Hong Kong in a steampunk aesthetic'the only note at the center that is counter to Williams and Tsien's Zenlike spaces.

The Zen aspect is most apparent when you ascend the outside stairs from the lobby to the roof of the main pavilion. Here an elegantly composed terrace with planting, courtyards, fountains, and seating immerses you in both the city and the jungle. The roof terrace, also lavishly surfaced in green Chinese marble, connects you to the upper level of the walkway along the east side for your jaunt to the upper site.

The project's cascading-down-the-slope configuration means that its most visible element is actually the pedestrian bridge and the roof terrace of the pavilion. Indeed, the only overall view of the Asia Society center is an aerial one, which a cluster of nearby skyscrapers can provide. As Tsien puts it, 'This is a horizontal building in a vertical city.'

A year after the $51.5 million complex opened, Alice Mong, executive director of the Asia Society Hong Kong, notes that the center 'has been a big hit with the community''although the staff already needs more room. This oasis in the middle of a bustling city offers a feeling of tranquility desperately desired and surprising to find. And in doing so, it transports you through time and space, between old and new architecture.

A conversation with: Billie Tsien and Tod Williams

Billie Tsien and Tod Williams
Photo © Christopher Sturman

Billie Tsien and Tod Williams formed a professional partnership in 1986, nine years after Tsien started working at Williams's office and three years after they married. The two collaborate closely on the design of their projects'they say it is hard to properly parse the process of designing together. Williams says of Tsien: 'She's the smart one and controls the world.' Tsien demurs, replying that they make decisions together by bantering back and forth, to which Williams adds, 'Sometimes we disagree. We do butt heads, yet the period is short and resolved without bruising.' Tsien elucidates, 'But we don't compromise'the decision comes at the end of a long and interesting conversation.' Tsien praises Williams for focusing more on construction and visualizing easily in the third dimension, while she volunteers, 'I think in terms of composition and aesthetics.' Williams notes, 'Billie steps back philosophically.'

Architect: Tod Williams Billie Tsien Architects

Size: 65,000 square feet (gross)

Cost: $51.5 million

Completion date: February 2012


Asia Society Hong Kong

The Hong Kong Jockey Club Former Explosives Magazine
9 Justice Drive, Admiralty, Hong Kong

Completion Date (Month and Year):
February 2012

Gross square footage:
GSF: 65,000SF

New building construction – Pavilion building: 10,173 SF
Building Renovations – GG Block, Lab Building, Magazine A and B: 16,927 SF
Site construction including roof terrace and footbridge – 21,026 SF
General site construction including site paving on upper site, car drop off, zen garden etc – 16,874 SF

Total construction cost:

Tod Williams Billie Tsien Architects
222 Central Park South
New York, NY 10019
Phone: 212.582.2385

Design Architect:
Tod Williams Billie Tsien Architects

Tod Williams, Principal
Billie Tsien, Principal
William Vincent, Project Architect
Robin Blodgett, team member
Johnny Cho, team member
David Later, team member
Aurelie Paradiso, team member
Miriam Petersen, team member
John Skillern, team member
Elisa Testa, team member
Jennifer Turner, team member
Mathieu Verougstraete, Intern

Owners Rep:
Patrick Chung & Associates Ltd.
Associate Architect – Core and Shell:
AGC Design Ltd. (Hong Kong)

Associate Architect – Interiors:
Associated Architects Ltd. (Hong Kong)

Structural Engineers:
Severud Associates (New York)
Ove Arup & Partners Hong Kong Limited (Hong Kong)

Mechanical Engineers:
Altieri Sebor Wieber LLC (Norwalk, CT)
J. Roger Preston Co. Ltd. (Hong Kong)

Civil Engineer / Geotechnical Engineer:
Ove Arup & Partners Hong Kong Limited (Hong Kong)

Restoration/Preservation Consultant:
Architectural Resources Group (San Francisco, CA)
Ivan C.C. Ho (Hong Kong)

ADI Limited (Hong Kong)

Fisher Dachs Associates (New York)

Over Arup & Partners Hong Kong Ltd. (Hong Kong)

Curtain Wall:
Axis Group Limited (San Diego, LA)

Water Feature Consultant:
Dan Euser Waterarchitecture, Inc. (Ontario, CA)

Stone Consultant:
Walker and Zanger (Mount Vernon, NY)

Acoustic Dimensions (New Rochelle, NY)

Construction Specifications, Inc. (Englishtown, NJ)

Davis Langdon & Seah International (Hong Kong)

General contractor – Core & Shell:
Hip Hing Construction Co. Ltd. (Hong Kong)

General contractor –Interiors:
Interiors – Yearfull Contracting Limited (Hong Kong)

© Michael Moran / OTTO
Phone: 718.237.8830
Email: Michael@moranstudio.com

Drawing (s):
Courtesy Tod Williams Billie Tsien Architects

CAD system, project management, or other software used:



Structural system
Cast in place concrete

Exterior cladding:
Mist Green Marble (Green stone from Shanxi, China used for Pavilion cladding)

Furging Black (Grey Stone used as interior and exterior pavers)
Shaxi Black (Black Stone used for exterior elements such as planters, to clad passage through berm B, benches, etc).
Iran Moca (Beige stone used to clad lobby and part of Jockey Hall)

Silver Tiles on the underside of upper level footbridge:
Made by YCC (China)
Silver Metallic glazed ceramic tile
Model: CYC001

Interior finishes
Acoustical ceilings: Ecophon

Acoustical Curtain/Blackout Drapery:
Used in Jockey Hall
Knoll Fabric
Name: Eve
Color: Granite
Style Number: D1058/6

Cabinetwork and custom millwork: Corian

Jockey Hall and Theater:
Tandus Flooring
Name: Atmosphere
Style #: 03666
Color: Russet Silk (#49504)

Tandus Flooring with Suzanne Tick
Name: Gridline
Style #: 06108

Fixed seating:
Auditorium chairs: Camatic Seating

For Auditorium seating:
Kobe Fabric
Article: Bronzo
Color: 00022

Interior ambient lighting:

Task lighting: