Would be better to replace some of that office space with living space, that’s a more sensible use of the area
Who would want to live in the middle of a CBD?
The only possible reason I can think of is to avoid the hellish commute into/out of a CBD every day… but if there were less offices in the CBD then there wouldn’t be a hellish commute, and you’d be far happier living near the CBD instead of in the CBD.
Having “living space” doesn’t just mean somewhere to sleep, it also means somewhere to kick a ball around or read a book in peace under the shade of a tree. Space like that is in extremely short supply in any CBD - even where it exists someone else is already using it so you can’t.
Offices also don’t have enough water infrastructure for a bunch of people to have a shower at the same time, or enough gas/electricity for everyone to make a cup of coffee or cook at once. They’d need major infrastructure upgrades to support residential living and it usually makes more sense to find some other use until they are old enough to justify being demolished and rebuilt.