Engineers aren't infalliable, and the checks and balances that should happen can be missed.
We have a good example of a rental building in Langford (Danbrook one) that was constructed in 2018/19.
Apparently the structural engineer was not correctly certified, and the structural design of the building was massively deficient and dangerous to the point that the city of langford pulled the occupancy permit just a few months after the building reached full occupancy. Everyone had to leave.
They only just finished fixing the deficiencies and started re-occupying last year.
https://www.capitaldaily.ca/news/sho...ook-one-design