Extra Storey of a Building Between Floors
Puzzle 14 of Building a House Hard Pack
Question is: Extra Storey of a Building Between Floors
and the answer is: MEZZANINE
Word Meaning:
MEZZANINE — An intermediate floor or storey in between the main floors of a building; specifically, one that is directly above the ground floor which does not extend over the whole floorspace of the building, and so resembles a large balcony overlooking the ground floor; an entresol.
Definitions from Wiktionary.