"The National Assessment RMA Policies and Plans - Heritage Provisions 2018." Heritage New Zealand Pouhere Taonga Report can be found at the following link.

http://www.heritage.org.nz/protecting-heritage/-/media/54e6192a0ea0452498f2b4271545f232.ashx

Media coverage:
"Protecting Maori heritage comes second best, new report reveals" Stuff Online
"Heritage pakeha buildings are better protected by rules and regulations than Maori heritage sites, a new report by Heritage New Zealand Pouhere Taonga reveals.
The crown entity advocating for the protection and preservation of heritage examines councils' plans every three years to see how well they are performing in this area. ...
... Heritage New Zealand (HNZ) wants destruction of Maori heritage places to be a non-complying activity in a district plan. ..."
https://www.stuff.co.nz/business/109964759/protecting-maori-heritage-comes-second-best-new-report-reveals

Heritage sites face demolition under draft district plan proposal- Stuff Online

"New Plymouth's building history is disappearing fast and little is being done by authorities to keep it, a heritage historian says.
Victoria University Wellington conservation research historian Hamish Crimp has spent the past year documenting residential and commercial buildings dating back to the first European settlement from 1840s, outside the city's central business district. ..."
https://www.stuff.co.nz/national/102103110/heritage-sites-face-demolition-under-draft-district-plan-proposal