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mezzanine floor 
Intermediate level created in an area having a high ceiling; it is accessible by interior stairs.
master bedroom, cathedral roof
The largest room for sleeping. This one is enclosed by a high ceiling having two slopes.
railing
Handrail at support level bordering the open side of a room.
study
Room intended for intellectual work; it usually contains a worktable.
stairwell skylight
Window protruding though a roof to ventilate and illuminate the stairwell.
bathroom skylight
Window protruding though a roof to ventilate and illuminate the bathroom.
