Herdefel
The apartment numbers are structured as follows; [BUILDING LETTER] [LEVEL] [DOOR NUMBER]. For example E112, KG12, M304. Full address to read KG12/81-86 Courallie Avenue, Homebush West, NSW 2140.

Source: https://support.google.com/maps/thread/7318017/how-do-i-identify-1100-apartments-in-my-complex-on-google-maps?msgid=7382487