We have a time lapse camera set up to capture the lowering of the Gallery Apartments. While looking at the footage, we noticed a bright light in one of the windows:

So what was it? We're not superstitious or anything, but it happened at 11pm on the 11th day of the 11th month of the 11th year, so that just HAS to signify something.

A close encounter of some sort really does seem the obvious explanation, but we would love to hear from you if you can suggest anything more plausible.