This final step requires at least one player to buy the Galvaknuckles, remember, they're inside the elevator shaft in the upside down building. The player must hit the four corners of the satellite tower on the rooftop of the second building until it glows blue.
The order the corners must be hit is random. You can figure it out based on seven or eight small white tiles hidden around the map, but it would probably take longer than trial and error.
Activating the tower will complete the Easter Egg and unlock the High Maintenance achievement / trophy.