So you can understand that builders were a bit shocked to find a fox was found living on the 72nd floor.
The Foxl, nicknamed Romeo by staff, entered the building through a central stairwell before climbing to the top. It was living off scraps left by builders.
Pest control officers from Southwark council captured the fox after two weeks and took it to an animal sanctuary. It was released later near London Bridge.
Les Leonard, a pest control officer, said:
At first I didn't believe it was up there, I thought it must be a hoax. I've got a fear of heights and getting the hoist lift from the 35th floor to the 72nd was terrifying.
On the second day it ran straight past us then scrambled up a 10 foot ladder onto the rafters. It was surreal, we couldn't believe that a fox could go that high.