Why would anyone build a building with only 30 years expectancy.It only had a 30 year life expectancy, no one did anything "wrong". Except that it has been left in place much longer than it should have been.
Even the bible has a higher life expectancy, albeit for the children of God.
3 score and 10 is the alloted span.
If designers and Architects are aware of this proviso, why don't they plan accordingly.

