An apartment is a self-contained housing unit that occupies only part of a building, typically on a single story. Such buildings may be referred to as 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.
A town house is a dwelling unit, generally having two or more floors and attached to other similar units via party walls. Town houses are often used in planned unit developments and condominium developments, which provide for clustered or attached housing and common open space.
