It can be, but usually isn't. People don't make concrete buildings to last 100 years.
Normally, chlorides, and carbonation set the expiration date on a building.
In China, 20 year old, if not 10 year old highrises are knocked down. Before I saw that myself, I thought that it's madness.
A big issue people don't talk about is that a lot of the concrete China makes is subpar and not up to spec by US or EU standards - they don't use the right (aka more expensive) grade of sand, so the concrete doesn't bind as strongly as it should. The sand used to make concrete has to have rough edges, something about the surface area, which ironically means that desert sands aren't very useful - they've been rounded by wind erosion and rubbing against other sand grains.
Think of 2-4 mansion apartments per floor. Nothing else would've made economic sense.
In comparison, the densest tower I seen in China had whooping 24 apartments per floor.
Isn’t it part of their 12% year on year growth strategy? Whatever it takes to make these numbers happen? Which is also why China builds cities designed for millions of people that remain ghost towns once they’re done: they’re not really built to be lived in but to boost the economy activity via construction costs.
But economic gain is there too. The surreal real estate bubble makes knocking down even 10 year old buildings profitable.