[MargaretR]

I suspect that many public buildings are not a sound as they look.
When I looked after Melbourne House we had a problem with the concrete pillars which are the basis for the whole structure - think 'Ronan Point' and you will understand.
The weight on the floors holds the walls in - there were 'no go' areas where you could not place heavy filing cabinets.
These pillars are metal reinforced concrete and they were shoddily made because the bubbles were not shaken out of the concrete mix -these air bubbles contain moisture which is now rusting the metal reinforcement -it showed internally with the finding of some damp patches on the pillars.

So if Melbourne House ever becomes 'a block of luxury apartments' don't buy one