1. A reflection of what? As the camera is panned around the room you see that she's the only one there and I'd assume such a clear reflection would only come from someone being a foot away from the window.

2. Look at the other videos posted, they're all boring real estate oriented videos with absolutely no woo-woo going on in them. Either it's a really elaborate set-up where they want to look legit and throw in this video as a curveball or it just happens that there's a strange mix of light and shadow causing the image of a face to appear in a window.

Heck, I would've thought it was suspect if the cameraperson saw the face and started calling everyone over to see what was going on. Just surprised that it wasn't seen in the first place.

My theory is the windows across the street or a billboard make the face appear in the window. Still pretty cool.