@struggler said:
I know that in our townhouse complex … the OC is responsible for the airspace above the courtyards therefore is responsible for the part of any tree in the airspace (I think about 3 metres above the ground).
Ah yes, I think that is an ACT/NSW difference. In the ACT I own and am responsible for everything above my unit, possibly a wedge extending out beyond the solar system. Elsewhere on the forum I think I saw a mention that only some meters above a townhouse in NSW belong to you/is your responsibility.