In reply to Chris Ellyatt:
Unfortunately, Highclimber is also spot on, in this case!
Fundamentally, it is someone else's land and property and you have no right to use it or do anything to it, apparently disused or otherwise.
This would be the sort of thing that gives climbers a bad name.
If you want to do a bit of sneaky bouldering or traversing, that's one thing, but bolting it is a step too far, for your own safety (you don't want a bolt pulling out or pulling the roof down on you), as much as any considerations of damage to property.