Some students , staff and visitors were present in the Unlimited buildings during the 6.3 magnitude earthquake on 22 February 2011 . A number of people , particularly students , were not present that day or had left the school the hour before the quake , due to many staff attending a paid union meeting in the Christchurch Town Hall . The Hallensteins Building ( dubbed the " Northern Tower " ) had already suffered minor damage in the 2010 Canterbury earthquake but was safe to use through to February 2011 . After the 2011 Christchurch earthquake , the building was said to be structurally safe , but was demolished in 2012 allegedly at the will of the owners
2010 Canterbury earthquake
2010 Canterbury earthquake
Ao Tawhiti