Question: What firm helped design the major city of Suntec located in Marina Centre?

Context paragraphs:
Mandarin Oriental, Singapore: Mandarin Oriental, Singapore is a luxury hotel located in Marina Centre next to Marina Square Shopping Mall and near Suntec City, home to one of Asia Pacific's largest convention centres – the Suntec Singapore International Convention and Exhibition Centre, and the city's financial district.

One Raffles Link: One Raffles Link (Chinese: 莱佛士连道一号) is an office building located at Marina Centre, Singapore.  The building is six storeys high with a basement and is managed by Hongkong Land.  Completed in 2000, it was jointly designed by world-renowned architect, Kohn Pedersen Fox and Aedas LPT Architects.  The development costs S$340 million and is a Grade A office building.  VISA, Credit Suisse, Goldman Sachs and Citibank are major tenants of the building.  Built on an elongated slip of land, the building offers the largest columnless floor-plates in the city.  The development includes CityLink Mall, Singapore's first subterranean mall, which links One Raffles Link with the City Hall MRT Station, Raffles City, Marina Square, Suntec City and the Esplanade.

Esplanade MRT Station: Esplanade MRT Station (CC3) is an underground Mass Rapid Transit station on the Circle Line in Downtown Core, Singapore, at the junction of Bras Basah Road, Raffles Boulevard and Nicoll Highway.  The station was opened on 17 April 2010 along with the rest of Stages 1 & 2 of the Circle Line.  It is located next to the War Memorial Park, the Suntec City Mall and the Suntec Singapore International Convention and Exhibition Centre.  The station also has a link to Raffles City, CityLink Mall, Suntec City Mall and Marina Square.

Centennial Tower (Singapore): Centennial Tower is a 158 m , 37 storey high-rise office skyscraper in the central business district of Singapore.  It is located on 3 Temasek Avenue, in the zone of Marina Centre.  The building is nearby other skyscrapers such as Millenia Tower, and Suntec City.

The Pan Pacific Singapore: Pan Pacific Singapore (Chinese: 新加坡泛太平洋酒店) is a hotel located in Marina Centre, Singapore, and operated by the Pan Pacific Hotels and Resorts.  With 38 floors, it is the tallest among the three hotels which are part of the Marina Square development, the other two being the Marina Mandarin Singapore and The Oriental Singapore.  The hotel has 790 rooms and suites, arranged around an atrium extending 35 floors of the building, touted as the tallest in Southeast Asia.

Helix Bridge: The Helix Bridge, officially The Helix, and previously known as the Double Helix Bridge, is a pedestrian bridge linking Marina Centre with Marina South in the Marina Bay area in Singapore.  It was officially opened on 24 April 2010 at 9 pm; however, only half was opened due to ongoing construction at the Marina Bay Sands.  It is located beside the Benjamin Sheares Bridge and is accompanied by a vehicular bridge, known as the Bayfront Bridge.  The entire bridge was opened on 18 July 2010 to complete the entire walkway around Marina Bay.

Singapore 2006: Singapore 2006 was a group of several concurrent events that were held in Singapore in support of the 61st Annual Meetings of the Boards of Governors of the International Monetary Fund and the World Bank Group.  The opening ceremony and plenary sessions for the main meetings took place from 19–20 September 2006 at the Suntec Singapore International Convention and Exhibition Centre (SSICEC) in Marina Centre.  The ministers of G8, G10 and G24 coincided with the event on 16 September.  Registration for event delegates began on 11 September 2006 at City Hall, and the three-day Program of Seminars from 16 September 2006 at the Pan Pacific Singapore.  Other concurrent events that were held at various venues include the Singapore Biennale 2006 (4 September – 12 November), the Raffles Forum 2006 (14–15 September), Indonesia Day (17 September) and the Global Emerging Markets Investors Forum and Networking Reception (18 September).

CityLink Mall: CityLink Mall () is Singapore's first underground mall, located within the One Raffles Link development at Marina Square.  Opened on 1 July 2000, the 60000 sqft underground mall connects City Hall and Esplanade on the Mass Rapid Transit, and to Suntec City Mall, Marina Square, hotels in Marina Centre, Millenia Singapore and to Esplanade - Theatres on the Bay.

Tsao &amp; McKown Architects: Tsao & McKown Architects is an architecture firm.  The firm helped design Suntec City.  In 2009 the firm received a National Design Award.

Suntec City: Suntec City is a major multi-use development located in Marina Centre, a subzone of the Downtown Core in Singapore.  Construction began on 18 January 1992 (with earthworks) followed by full completion and opening on 22 July 1997.

Supporting paragraphs: Tsao &amp; McKown Architects Suntec City
Answer: Tsao & McKown Architects