There may well be the possibility of a detached dual occ on that size lot, with the potential for subdivision.
It's too small for a standard torrens sub.
Sorry, I'm not up to speed on title types etc, do you mean by that that essentially a detached dual occ would be the same scenario as a Granny Flat but without the size constraints? As is, we could end up with 2 houses on there and lease each seperately but wouldn't be able to sell each individually?