<Ul> <Li> Apartment (American English) or Flat (British English)--An individual unit in a multi-unit building . The boundaries of the apartment are generally defined by a perimeter of locked or lockable doors . Often seen in multi-story apartment buildings . </Li> <Li> Multi-family house--Often seen in multi-story detached buildings, where each floor is a separate apartment or unit . </Li> <Li> Terraced house (a . k. a . townhouse or rowhouse)--A number of single or multi-unit buildings in a continuous row with shared walls and no intervening space . </Li> <Li> Condominium (American English)--A building or complex, similar to apartments, owned by individuals . Common grounds and common areas within the complex are owned and shared jointly . In North America, there are townhouse or rowhouse style condominiums as well . The British equivalent is a block of flats . </Li> <Li> Cooperative (a . k. a . co-op)--A type of multiple ownership in which the residents of a multi-unit housing complex own shares in the cooperative corporation that owns the property, giving each resident the right to occupy a specific apartment or unit . </Li> </Ul> <Li> Apartment (American English) or Flat (British English)--An individual unit in a multi-unit building . The boundaries of the apartment are generally defined by a perimeter of locked or lockable doors . Often seen in multi-story apartment buildings . </Li> <Li> Multi-family house--Often seen in multi-story detached buildings, where each floor is a separate apartment or unit . </Li> <Li> Terraced house (a . k. a . townhouse or rowhouse)--A number of single or multi-unit buildings in a continuous row with shared walls and no intervening space . </Li>

One of the main type of investment in real estate is