Let's just stick to English for general accessibility. 
That's an interesting angle. The A/Bs are probably on the same lot, but I don't think that trying to map this distinction is very fruitful. It falls short of on the ground verifiability for one, as the buildings will just have normal numbers and letters on their walls. 

https://wiki.openstreetmap.org/wiki/Verifiability

Many renderers will also ignore units.
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