#annex__annexe__extension__wing  an addition that extends a main building
  supertype:  #improver__addition  a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinammon improved the flavor"
  subtype:  #ell  an extension at the end and at right angles to the main building
  part of:  #edifice__building  a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"

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