I am now feeling a bit dim – this is a lot simpler than it seems … provided nobody pays for their own windows to be fixed.
If the owners corp pays for the windows to be fixed (as it should) then it will all even out when the other owners need their widows repaired. If they don’t want the windows fixed, that’s up to them … but the windows aren’t theirs to begin with. They’re common property.
So forget all this stuff about paying for the windows yourself. Raise the money from levies to pay for the windows and do it again later when the other windows start to fail. Nobody loses, nobody pays twice – it’s really that simple.