The Real Danger of Condemned Buildings
This has a few words of advice for anyone who plans on visiting an abandoned building. Steer clear of wooden stairs. There’s no telling how weak they are just by looking at them, and if you do step foot on one, be prepared to fall several feet onto the ground.
The OP’s buddy broke both of his legs while exploring inside of an old building. However, we’re not so quick to believe that you won’t encounter serial killers, ghosts, or whatever else in decaying buildings. We’ve already read a few stories that involve mysterious hushing noises and a cult of cannibals (probably).