Twin Tower
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Twin Tower (Template:Zh) is a 1970s Hong Kong public housing residential block design. In plan, the blocks look like two hollow squares joined at one corner of each square. Each block comprises two "towers" of different heights, although their shapes are the same. The high tower ranges from 24 to 28 stories while the low tower is 21 stories. The size of a typical flat is 36 to 46 m2. It cannot support more than 5 people in a typical flat.<ref>"Memories of Home – 50 Years of Public Housing in Hong Kong" Template:Webarchive</ref>
The units in Twin Tower blocks are self-contained flats, each with a kitchen, toilet, and balcony.<ref name="newdesign">Template:Cite news</ref>
The first Twin Tower blocks appeared at Wah Fu Estate. They were suited to the steeply sloping site, as one of the two "towers" within each block is offset by three storeys from the other, providing ground level entrances at multiple points along the slope. The two central atria in each block measure 50 by 50 feet.<ref name="hkia72">Template:Cite journal</ref> Reportedly, the square shape of the twin tower design provided the structural stability necessary to build more floors than the earlier, narrower slab blocks.<ref name="happy">Template:Cite news</ref>
The Twin Tower blocks at Wah Fu make use of load-bearing partition walls which make construction faster through standardisation, obviate the need for interior columns within flats, and improve structural wind resistance.<ref name="hkia72"/>
After their introduction at Wah Fu Estate, the Twin Tower design appeared at Oi Man Estate and then many other public estates across Hong Kong in the 1970s.
List of blocksEdit
| District | Name of estate | No. blocks | Year of completion |
|---|---|---|---|
| Southern | Wah Fu Estate | 6 | 1970 |
| Kowloon City | Oi Man Estate | 5 | 1974 |
| Wong Tai Sin | Choi Wan Estate | 3 | 1978 |
| Chuk Yuen (South) Estate | 3 | 1983 | |
| Kwun Tong | Sau Mau Ping Estate | 1 | 1984 |
| Shun Lee Estate | 3 | 1978 | |
| Shun Tin Estate | 4 | 1982 | |
| Kwai Tsing | Cheung Ching Estate | 6 | 1977 |
| Lai Yiu Estate | 3 | 1976 | |
| Tsuen Wan | Cheung Shan Estate | 2 | 1978 |
| Tuen Mun | Wu King Estate | 6 | 1982 |
| Yau Oi Estate | 3 | 1981 | |
| Tai Po | Kwong Fuk Estate | 4 | 1983 |
| Shatin | Lung Hang Estate | 3 | 1983 |
| Sun Chui Estate | 3 | 1984 | |
| Wo Che Estate | 6 | 1977 | |
| Total | 61 |