Tony Stark’s hidden lake house laboratory is located on the east side of the large lake in the upper state New York area that was recently added to the map. If you missed it, it is the giant landmass added to the northeast side of the map. It also features Stark Laboratories.

To locate it, head to the cabin on the EAST side of the lake. That’s where Tony Stark’s hidden lake house laboratory is situated.

Head up the driveway and at the end of said driveway, you’ll see a large bush next to the house. Interesting bush…

Slice or just walk through the bush, and you’ll see a garage door. Smash through that and you’ll see the hidden lake house laboratory with some cool Stark tech and other stuff.

25,000 XP, chi-ching.