abut directly onto each other built with shared party walls between dwellings whose uniform fronts and uniform height created an ensemble that was more stylish than a "rowhouse". However, this is also the UK term for a "rowhouse" regardless of whether the houses are identical or not. Back-to-back: terraced houses which also adjoin a second terrace to the rear. They were a common form of housing for workers during the Industrial Revolution in England. Tower block or Apartment tower: a high-rise apartment building. Townhouse: also called Rowhouse (US). In the UK, a townhouse is a traditional term for an upper-class house in London (in contrast with country house), and is now coming into use as a term for new terraced houses, which are often three or more stories tall and may include a garage on the ground floor. Stacked townhouse: units are stacked on each other; units may be multilevel; all units have direct access from the outside. Three family home or Three family house: U.S. real estate and advertising term for several configurations of apartment classed dwelling buildings including: Triple decker: a three-family apartment house, usually of frame construction, in which all three apartment units are stacked on top of one another. (For additional characteristics, also see Multifamily home features below.) Triplex (American English), Three-flat (British English) - a building similar to a duplex except there are three stories. Two-flat and possibly three-flat buildings are rather common in certain older neighborhoods in certain cities. Townhouse - a house attached to any number of other townhouses each of which may have multiple floors, commonly side by side each with their own separate entrances. Each such house has its own owner. Two decker: a two family house consisting of stacked apartments that frequently have similar or identical floor plans. Some two deckers, usually ones starting as single-family homes, have one or both floors sub-divided and are therefore three or four-family dwellings. Some have external stairways giving a totally separate entrance, and some, usually those which have been a single-family house now sub-divided, are similar to the Maisonette plan but sharing a common external 'main entrance' door and lock, and a main internal hall with stairways letting to the separate apartments. (For additional characteristics, also see Multifamily home features below.) Tyneside flat: a pair of single-storey flats in a two-storey terrace, distinctively with two separate front doors to the street rather than