entresol

noun

1. A mezzanine; an intermediate floor in a building, typically resembling a balcony; most often, the floor immediately above the ground floor and below a higher floor.

   “The late lord in autumn filled Castlewood with company, who drank claret till midnight: the present man buries himself in a hut on a Scotch mountain, and passes November in two or three closets in an entresol at Paris, where his amusements are a dinner at a cafe and a box at a little theatre.”

   “This idea, however, was luckily all before him again from the moment he crossed the threshold of the little entresol of the Quartier Marbœuf into which she had gathered, as she said, picking them up in a thousand flights and funny little passionate pounces, the makings of a final nest.”