An apartment (American English), or flat (British English, Indian English, South African English), is a self-contained housing unit (a type of residential real estate) that occupies only part of a building, generally on a single story. There are many names for these overall buildings, see below. The housing tenure of apartments also varies considerably, from large-scale public housing, to owner occupancy within what is legally a condominium (strata title or commonhold), to tenants renting from a private landlord (see leasehold estate). Terminology The term apartment is favored in North America (although in some cities flat is used for a unit which is part of a house containing two or three units, typically one to a floor). In the UK, the term apartment is more usual in professional real estate and architectural circles where otherwise the term flat is used commonly, but not exclusively, for an apartment on a single level (hence a 'flat' apartment). In some countries, the word 'unit' is a more general term referring to both apartments and rental business suites. The word 'unit' is generally used only in the context of a specific building. Some buildings can be characterized as 'mixed-use buildings', meaning part of the building is for commercial, business, or office use, usually on the first floor or first couple of floors, and one or more apartments are found in the rest of the building, usually on the upper floors. = By housing tenure =(Condominium, public housing, owner-occupancy, etc. )Tenement law refers to the feudal basis of permanent property such as land or rents. It may be found combined as in 'Messuage or Tenement' to encompass all the land, buildings and other assets of a property.