Thanks, as I mentioned, if I run into it again, I'll have more concrete evidence for you...

I believe it was simply an enlongated cube - a building as I had mentioned.

I remember using the ortho views trying to snap all the way at the top of the building but I couldn't get the center (dbl-clicked the top edge to get the curve) and then trying it from perspective it would only snap all the way back down on the ground plane...

Anyway, I'll keep an eye out. ;-)

-Will