[bruce511]

That's one interpretation. The other is that the building predated to code, and it was impossible, or too expensive, to retrofit the building.

Alas I do not live in Christchurch so I can't comment to this specific case. However, in general new buildings are subject to new codes, where old buildings may not be.

[mantas]

In that case there are no lessons to learn. Aside from GTFO from such grandfathered buildings if you can.