Unlike buildings one and two, most of the stairs inside building three have been removed probably because it extends up five stories and there is more possibility of injury.

As a result I can't tell exactly how many stories up the trees that you see sprouting from the building begin. And yes, they really are growing inside the building; it's not an optical illusion created by some very tall trees in the background. Somewhere up there two trees have taken root and started to claim the area back for mother nature.