The phrase "floor hallway" refers to a long narrow interior passage on a level or story of a building, usually on the ground or any specific floor. Full definition
The laundry closet is situated in our second floor hallway behind a set of double doors immediately adjacent to a second, narrower set of doors that open to our linen closet. (blueistyleblog.com)
We not only hit the top floor midway through the term, but we went all along the third floor hallway and headed down the back stairs! (motherscircle.net)
From the common 2nd floor hallway, you'll enter the unit and go downstairs a half - flight to the kitchen, dining and living room. (wyndhamvacationrentals.com)