In American English, what is this self-contained housing unit (a type of residential real estate) that occupies only part of a building, of which the living place of the lives of six young people from Bedsitcom?
Apartment An apartment (American English), flat (British English) or unit (Australian English), is a self-contained housing unit (a type of residential real estate) that occupies only part of a building, generally on a single level. Such a building may be called an "apartment building", "apartment complex", "flat complex", "block of flats", "tower block", "high-rise" or, occasionally "mansion block" (in British English), especially if it consists of many apartments for rent. In Scotland, it is called a block of flats or, if it is a traditional sandstone building, a "tenement", which has a pejorative connotation elsewhere. Apartments may be owned by an "owner/occupier", by leasehold tenure or rented by "tenants" (two types of housing tenure).
Common area A common area is, in real estate or real property law, the "area which is available for use by more than one person..." The common areas are those that are available for common use by all tenants, (or) groups of tenants and their invitees. In Texas and other parts of the United States, it is "An area inside a housing development that is owned by all residents or by an overall management structure which charges each tenant for maintenance and upkeep."