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As a cost-cutting measure, the organisation is closing its stores in north and south Dunedin and Mosgiel, and creating offices within existing businesses in those areas.
From Monday, John MacDonell will take over the South Dunedin post shop premises and turn it into a book store, which will also contain a space for NZ Post to continue its operations.
And in North Dunedin, NZ Post will vacate its premises on April 10 and move in with the University Book Shop from April 11.
A partnership has already begun with the Octagon Night n Day, to help deliver postal services.
New Zealand Post retail head Mark Yagmich said he was delighted to be able to make the announcement.
"While we acknowledge this is a change in how people access these services, we already successfully work in this way in over 800 locations across the country, and have done so throughout New Zealand for many years.
"This model of working with local businesses is more financially sustainable for NZ Post, in an ever-changing mix of postal services usage - the decline of letter mail, versus the significant increase in parcel services.
"It's also good for the businesses we work with, as they enjoy additional income both from transacting postal services on our behalf and by having more customers coming through their doors to send their parcel or postcard."
He said customers would also benefit from longer opening hours.
"Such as in this case, with both new partners being open longer on Saturday and also open on Sunday."
University Book Shop general manager Phillippa Duffy said she was looking forward to offering "a seamless continuation" of post and bill pay services in their area.
"This is a unique community, and we understand our customers' needs.
"We're excited to be offering the convenience of postal services and bill payments alongside our books, gifts and stationery."
Mr Yagmich said good progress was being made in the search for a local partner in Mosgiel, and it was hoped an announcement could be made soon.