"An apartment (American English), or flat (British English, Indian English), is a self-contained housing unit (a type of residential real estate) that occupies only part of ...
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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)." - (en.wikipedia.org 06.01.2021)