Corrected entry: Towards the end, during the climatic fight between Spider-Man and Green Goblin, there is a part where Goblin is against a wall (this is just before he spears himself with his own hoverboard) and the floor at his feet is fairly intact, but when Peter jumps down the floor is a lot less intact (this is shown from a sideview displaying both Goblin and Spider-Man).
Jack Vaughan
22nd Oct 2009
Correction: The building is old and has fallen apart over some time and the fight. some of the floor is intact while there are sections that are missing. you could see missing pieces whe the fight first arrives in the building.