13/08/19 UPDATE
After a year of construction there is now a new warehouse right next to GZ. Take care during working hours not to get spotted!
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The Landing is a business park being developed in Mangere. I work nearby and often walk past here and have watched several new buildings being constructed. A lot of landscaping has already taken place and there is a manmade pond nearby which has a path alongside.
When the cache was placed it was still relatively empty in this particular area although you may come across workmen or gardeners. As the area develops I'm sure this will change and it will become a lot busier. At various times the roads have been closed while work is taking place.
Co-ordinates were taken over many days and averaged out, so hopefully accurate. When placed the cache contained only a logbook. BYOP.