Hopefully this piece of legislation is designed to be a ‘catch all’ and the interpretation of ‘adjacent’ means the actual common property walkway/firedoor that is used to access the fire stairs which of course means the owners corporation rather than the flat closest to the fire stairs.
In addition to the commercial lots, I can only think of some old warehouse style apartments which also have the New-York style window fire escapes that this individual lot owner responsibility might be applicable to.
But I would be interested to see how your contact interprets this….