I had to move out of an apartment once because my landlord sold it (for close to a million dollars) to a couple who had never seen it and then moved in with both of their mothers (don't ask).
The unseen purchase struck me as odd, but it helped setting up the twist at the end. It felt like an action a person would take who is desperate to get away from something.
The story, it's sound. Mizal said it, but let me say it again. Great story. Very well played with the apostrophe. And, 'Its' being a special case apostrophe-wise made this pretty intense. The twist at the end is great, when you realize that it is all about the narrator and not the house. Really hard-hitting stuff. It comes out of nowhere but it is so well set up that it instantly clicks. It reminded me a lot of 'The Haunting of Hill House' (but better). The only constructive advice is that I can offer is that it could be tightened a bit. For example, does it matter what she tells, the answering machine. For me that sounded a bit repetitive and the business-like attitude broke the dreamy tone.