I don't know if this would be useful in your case, and it's desktop only, but in the UK because the convention is to have the house/apartment/anything number at the start of the line when I need to choose my address from a dropdown box I select the field, then type my numbers and it selects the right one. This works for dropdown boxes in general where you know the first letters/characters you are looking for (but I can imagine scenarios where it would be no hope, like if all the addresses are written with the differentiating number/detail at the end not the start). Page down / end keys are also useful for long lists (again, not so helpful on mobile).