I remember reading somewhere that when the building was getting really run down, and partially used as cheap office / storage space for the railway, that as the top floors suffered from more and more roof leaks, rotten window-frames and other problems, they didn't fix them, just retreated further down the building and gave up on it, a floor at a time!
Because they saw it as destined for eventual demolition, and so weren't going to spend any money on the fabric of the building.
It is good to see it fully restored after coming so close to demolition. Will have to pop into the bar for a (probably very expensive) drink some time.
Giles..