A loft is one type of structure that can provide a residence. It is generally a building that was originally built for industrial use, such as a downtown factory. And, it has been converted into multiple living spaces -- condominiums or apartments. It is usually characterized by the lack of interior wall and often some "character" from the original architecture, such as exposed brickwork, intricate friezes or high ceilings with large windows.
- Wikipedia's article on loft
Note: This is sometimes different from the other kind of loft, which means an upper floor that is partly open to the lower floor, like a barn loft or choir loft. However, as you can see from the picture above, a second floor space is sometimes added into the loft space.