Yeah I think the floor weight is the actual concern and reason it doesn’t happen rather than zoning, but if it’s possible to renovate it within something close to the same cost as starting again, they should renovate it. We need to start taking into account things like the pollution for stuff like this but it not being considered doesn’t mean someone isn’t getting the bill. I don’t think people who would prefer to demolish and start again consider amount of shit that will be put into the air if you knock down a good portion of the office buildings, even if it doesn’t effect much on a grander scale it will effect the actual cities.
Would be interesting if a structural engineer did a video on all the problems and solutions etc of converting office buildings. Maybe even getting away with the bottom few floors on all office big buildings would be a good start.