Deer Park Heights is located just outside Queenstown (follow directions to the airport, carry on by, cross the bridge and follow the road round, then take the turning on the right).
It was used for a variety of locations, mainly in Rohan, and it has some easily identifiable locations.
Warning – you do have to pay (NZ$15 when I went) and it’s to a machine that only takes notes/coins – so make sure you have cash.
As an added bonus there’s an old Korean prison built for the filming of “The Prison” by Disney some time back. You can’t get in it, but it’s fun to look at.