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Tower Block from WikiPedia:

A Tower block, Apartment tower, or Apartment block, Block of flats, is a multi-unit high-rise Apartment building. In some areas they may be referred to as "MDU" standing for "Multi Dwelling Unit".[citation needed] Apartment blocks have technical and economic advantages in areas with high population density. They have become a distinguished form 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 they occupy and also decrease the cost of municipal infrastructure.

Insulae (singular insula) were large apartment buildings where the Plebs (lower class) and Equates (middle class) of Romans dwelled. The floor at ground level was used for tabernas, shops and businesses with living space on the higher floors. These buildings were usually up to six or seven stories. Some went as high as nine stories before height restrictions came into effect.

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