Spider-man has once again joined up with the team of heroes to defeat the villain. They head out on the rooftops again from the Daily Bugle in pursuit of Doctor Octopus. Doctor Octopus flees across the rooftops behind a sign of Spider-Man himself. It’s time to stop this mechanical maniac.
When the characters load in, you are at the top of a staircase. Go back down the stairs and switch to Mr. Fantastic. There is a grate there that he can use. Slip through the grate and Mr. Fantastic will emerge in a small glass room on another part of the building. Bust everything for Lego coins and then go back through the grate. This is optional.
Across from the top of the stairs is the save terminal.
If you haven’t already saved your game, be sure to do so now. Switch to Spider-man and have him target the pull target across the roof on a blue communications tower. This will pull the tower down to make a bridge so the characters can cross. Octobots will try to deter your path.
See the complete article on GameSkinny.com about finishing the Baxter Building.