Don't question it, Luca. There's no rhyme or reason. One day the tower wasn't there and the next it was. Just a magical tower. It's fine.

"Oh, you don't have to worry about that at all. Me and Luz are the only humans in the house and both of us are really, really used to nonhumans at this point," and Varian is absolutely not going to tolerate any nonhuman being treated as less, no sir. "Well, if anyone gives you any trouble about that, let me know, okay? I'll deal with them."

He's going to leave what 'deal with them' means open to interpretation. It won't be nice though.