Known now as the Westpac Building which is being demolished.
This picture from archives is circa 1968-72 shows what was then the Bay of Plenty Savings Bank.
Later the building was fully upgraded to become the Trustbank building and later again the Westpac building (below)
I have seen buildings 5 times bigger than this taken down in seconds in the USA right in the middle of a busy city. It's not like there are many people downtown anymore. I vote for the big bang every time.😀