How not to number floors in a building

Usually you expect floors in any building to start at 1 or G (for Ground floor) and go from there. If you really want to be radical, you could go for A, B, C and so forth.


But check this out at Wahda Mall:

Starts (if that is the right word) with LB, and then goes on, UB, G, UG, 1, U1, 2, U2, LR and R.
You have to ask yourself why?