I have done some home work and this is it!
NT do require a property release unless you are submitting the images to their photo library. It is the same with a lot of privately owned buildings. As long as you are on public land though they can't really do anything
Some pictures of buildings require a property release to sell them, or to list them on stock agencies
you can sell any photo taken in a public place (or from a public place/right of way). I'm not sure what the rules are when people can be seen in the photo though.
Private land (such as an NT property) is different and the owner can place any restrictions they choose.