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In this way you can draw the floor in one piece while leaving an interior area open.
5.5 Split-Level Buildings
To represent buildings with split levels, import a drawing for each partial level and
draw in partial floors for the existing floor areas. Remember, though, that walls you
draw in on a lower level extend only to the height of the next higher level, even if they
do not meet a floor there. If your building has walls that extend through a split level,
you must draw them on the lower level and again in the unfloored space on the next
higher, partially floored level.