Nothing but 55,000 tonnes of debris will be left after the two inner-city blocks are knocked down to make way for the new Dunedin Hospital.
About 50,000 tonnes of that is destined for the Burnside landfill.
An estimated 4000 tonnes of scrap metal would be recycled and some of the buildings’ native timber would be salvaged.
Health Minister David Clark said there would be changes around the city and dust and traffic disruption would come with time.