Swing up Park. I’m going to lay them out for you.
New York Plaza – Quinjet Crashes
The quinjet with Hawkeye, Black Widow and Captain America flies in over Park Ave, shooting a number of Chitauri in front of Stark Tower. It is zapped by Loki, and flies off, crashing at 101 Park Ave, on the E 40th St. corner. This was one of a few scenes actually shot in New York City.
The giant Chitauri war beast exits the portal and heads down Park Ave. When Iron Man catches up it’s already turned and headed back up 5th Ave. It continues wandering around the city as Loki takes on more heroes.
Iron man manages to get the Leviathan’s attention causing it to turn into the building at 3 Park Ave. He leads it up Park Ave where all the Avengers destroy the beast!
Captain America suggest that Thor call down his lightning to aide in destruction of the Chituari. Thor complies by taking to the spire on the nearby Chrysler building.
Iron Man gives Hawkeye a lift to the northeast corner of this building, where he can have a vantage point of the entire battle. This is one of the shots in which it’s pretty obvious that the actor was not actually in the location, but instead shot in a studio.
Iron Man chases some Chitauri thru the tunnel of this New York landmark along Park Avenue…and out the other side. He makes a quick U-Turn and races back into the opposite tunnel. The Chitauri crash into 250 Park Ave across the street from this building.
Since the Chitauri can’t bank on their speeders, Stark leads them back thru the Park Ave tunnel in the Helmsley building, and they crash coming out the other side on 45th Street.
As the second Leviathan is about to crash into 90 Park Ave, Hulk charges from inside the building and turns the beast. It crashes into 99 Park Ave, across the street before heading southeast on E 39th St.
Hulk is joined by Thor somewhere over on 5th Avenue as the Leviathan continues flying. They work together and manage to kill, it driving it into the side of Grand Central Terminal on the Vanderbilt Ave side. This is the same creature we see Adrian Toomes & Co. cleaning up at the beginning of Spider-Man: Homecoming.
As Thor approaches a building, Leviathan #3 busts through a building followed by Iron Man. Interestingly this is the in-universe address (in the comics at least) for the Baxter Building, which is the headquarters of the Fantastic Four. The Leviathan continues to fly south on Madison.
Iron Man attempts to stop the third Leviathan with his laser, but that does nothing more than upset it. It is seen crashing into 67 Park Ave, before Stark gets the brilliant idea to fly inside it, like Jonah and the Whale.
(The Avengers, 2012)