This company manufactured experimental chemicals for crowd control and dispersal, but at some point there was a leak that filled the whole building up with some sort of green gas. Why aren’t you already going there? Hallucigen Inc. It’s near the top of the map, just up from Dark Hollow Pond. The robots are all named according to which jobs they do.
It’s also staffed entirely by robots, one of whom barks orders from inside a large statue that looks like a rocket ship. The Galleria is pretty well stocked with useful scavengable items, including chems, metals, and Nuka Colas. You can also set Jamaica Plain up as a settlement once you’ve cleaned it out. It’s very heavily defended and it’s a good idea to either be or take along an adept hacker like Nick Valentine, but the treasure may not be what you were expecting. Head south, to the tip of the marshes, and see if you can be the one to finally get your hands on it. This small town had some big ideas, and hundreds of years on people are still spreading rumours about the treasure of Jamaica Plain.