Tower block

A tower block, high-rise, residential towers, apartment tower, office tower, apartment block, or block of flats, is a tall building or structure used as a residential and/or office building. In some areas they may be referred to as "MDU" standing for "Multi Dwelling Unit". ... There is no clear difference between a tower block and a skyscraper, although a building with fifty or more stories is generally considered a skyscraper. ... Apartment buildings have technical and economic advantages in areas of high population density, and have become a distinctive feature of housing accommodation in virtually all densely populated urban areas around the world. In contrast with low-rise and single-family houses, apartment blocks accommodate more inhabitants per unit of area of land and decrease the cost of municipal infrastructure. [Tower block. Wikipedia]