A small dwelling, usually consisting of a single room, within a multi-family structure.  In many cases kitchen or bath facilities are not complete.  For example, an efficiency apartment may have a microwave and sink, but no stove or refrigerator.
Related information about efficiency unit:
- Efficiency Unit or Apartment: Definition from Answers.com
 A small dwelling unit, often consisting of a single room, within a multifamily   structure. In most cases, kitchen and bath facilities are not complete.
 
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 Definition of efficiency unit: A small dwelling, usually consisting of a single room,   within a multi-family structure. In many cases kitchen or bath facilities are not ...
 
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