Right now, in The Revenge of Seven, John is hiding in an old textile factory with Sam, a human friend, and Sarah, his girlfriend (also a human). This textile factory is described excellently with the quote I found. "We follow Sam down a rusty spiral staircase and onto the floor of the factory proper. The place must've been closed down in a hurry because there are still racks of musty, eighties-style men's suits pushed up against the walls and half-full boxes of raincoats abandoned on conveyor belts." This quote shows how old the factory is and how there is still clothes in the factory. This could mean that the people occupying the space before had to leave in a hurry because of a disaster. The line that says "eighties-style men's suits pushed up against the walls" really gave me a clear understanding of how old it was and how it was probably abandoned during the 80's. This means that no one has probably been in there forever which could lead to maybe someone living in there that could be bad. Possibly a Mogadorian.
Below is a picture of an old textile factory, which could show what it looked like in John's point of view.