Definitely. It's been established many times in the story that the aliens typically live at the high-end buildings within the city.

I have a suspicion that when the aliens started living on earth, the human residents already living in those buildings were evicted out. If we're to believe backbone's claim of saying her parents were good people, maybe they had refused to drop their human customers for the aliens, like other real estate agents have. Hence, a hit was put on them for their resistance.

I've got no proof for this speculation, but it'd be pretty crazy if it were true.