>M (for mezzanine) is often in between G and 2, and often but not always
has some notion of being less than a proper full floor
Speaking of which  many editors, users, editing software, tenderer and such
seems to assume levels must be integer which is not necessary to be
correct. For instance, I am currently sitting at level 3M of a particular
building, which is physically outside the building and is higher than level
3 while lower than level 4 of such building. If expressed in numerical
format, one might naturally say this is level=3.5, however such value
doesn't seems to be commonly understood by different tools
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