Sentence:  After Captain Docherty sent Arleigh Griffith for Hoag he was able to complete his detailed inspection of the third <WSD>floor</WSD> and to receive a report from his man covering the floors above before Griffith returned , buoyed up by a brief stop for another glass of champagne . 
Meaning of the word marked with <WSD> tags:  a structure consisting of a room or set of rooms at a single position along a vertical scale