Challenge (no prizes offered, but anyway)

[russotto]

A pyramid; aha, yes, that does explain things, including the reflections and the lack of shadow you'd expect from a rectangular building. I thought the triangular shape of the reflection was just an artifact. I've never been to Las Vegas.

As for how I figured it out: Go onto terraserver, and take a look at Philadelphia. Note that the north-south streets slant to the right. Look at SF, and the north-south streets slant to the left, even more than they do in the picture you have. Chicago has them almost straight up and down. I suspected this had something to do with the map projection rather than having something to do with the way the streets actually run. So this indicated the city probably was west of Chicago but east of SF.