May I suggest?  Sell the unit, cut your losses, buy off the plan in Darwin.
Darwin property prices HAVE NEVER REDUCED! Every 5 or 6 years they may plateau for a year but then up they go again.
Darwin is immune from the problems seen in southern cities such as rising and then falling prices. Most of our investors now are people from south like you guys who have seen bright lights up north.
Resourses like gas, minerals etc is driving our economy and we have just secured Japanese natural gas giant IMPEX who are ready to spend $12billion on a gas supply plant.
I have just bought a high rise unit off the plan and I WILL be rolling in it in 2 years ($$$ i mean)
Have a look, change your life!