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- A pencil tower (also known as a skinny skyscraper, pencil-thin tower, super-slender tower, or super-slim tower) is a high-rise building or skyscraper with a very high slenderness ratio that is very tall and thin. There is no universal definition of how slender these buildings are to be categorised, but some definitions of 10:1 or 12:1 ratios and higher have been used. Hong Kong started developing pencil towers in the 1970s. Residential buildings of twenty or more storeys with one unit per floor were built over small lots. It has become one of the most common types of buildings in the city, making Hong Kong the world's highest concentration of pencil towers. Hong Kong's most notable towers are the 72-storey Highcliff tower, which has a slenderness ratio of 20:1, and its neighbour, The Summit, a 65-storey residential building. In the 2010s, pencil towers became a new phenomenon of building design in New York City. The newer pencil towers on Manhattan's "Billionaires' Row" (a thin strip of Midtown near Central Park) are mostly supertalls. The first of this new crop of super-slim towers was the 306 m One57 tower. Two pencil towers on a section of 57th Street made the street the most expensive address in the global real estate market, with 41 transactions above US$25 million from 2015 to 2019. Outside of Hong Kong and New York City, Melbourne has become the centre of pencil towers. (en)
- 插針樓，又稱牙籤樓，是香港地產界用語，形容一些地盤面積小，而比旁邊社區特別高的單幢式樓宇。 (zh)
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