Let's think like architects here, in 3D!!!
I have a project with a three story base that covers the site (almost) and two towers growing out of the base like candlesticks on a birthday cake. The two towers have differing FTF heights, and one is taller than the other. However, two of the floors sync at +48.0', although they have different designations - level 4 and level 3M respectively.
When I placed rooms on level 3M and created a room schedule, they are listed as being on level 4! Is this a case of Revit using the first level it finds, or is there a way to distinguish levels that have different names but identical elevations?