Sunken rooms and back splits on the floor plan

Here’s a new question. How do sunken rooms get handled in the floor plans? Is it part of the adjoining floor or a floor of its own? My gut says that it is part of the adjoining floor. Any thoughts?

Drafters can comment on this, but I believe drafting standards stipulate there has to be “X” number of stairs between levels to constitute a separate floor (sorry I don’t remember the number of stairs), so a sunken room would be on the same floor as the adjoining floor if you go by that.

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Thanks. That was my thought but want to be sure