Unless they broke into the house, it had to be the home of one of the 5 party goers.
Good point for anyone who wants to know the truth.
None of the named partygoers claimed to live there. All they said was that the described party never happened, or that they never attended a party where Kavanaugh was there.
Nobody said anything like, "I attended parties there, but not this one," or "I remember that party, but it wasn't Kavanaugh," or even "It was my party, and I didn't invite Kavanaugh," or even "It was my party, and ______ brought Chrissy Ford."
So that leaves a very big gap in the story. Either one of them lived there and didn't offer it up because nobody asked that specific question, or there is still a missing witness who hasn't come forward.
-PJ