They're quite happy outside of the tropics as long as it's mild. Napier, east coast NZ, about 2 hours from here at 40 degrees S:
This is one of the most common ornamental trees around NZ. You'll see them everywhere except higher elevations. Despite the popular wisdom, they're not killed by light frost. They are hardy down to minus 2 or 3 at least, and I see them planted out in the open all over this part of the island.