The has one of my favourite things about architectural photos in it - an old building reflected in a new one. It's subtle but beautiful and now that I've noticed it, I'm getting pleasantly lost in the reflections.
I like the whole symmetrical/asymmetrical thing going on, that the parts of the building are just similar enough to look like it should be a diagram of something very precise, but the sections are just different enough to keep things interesting and allow for a really lovely capture of the building repeatedly mirrored in itself.
I love the effect of all the lines leading upwards to one point. It somehow lessens the feeling of vertigo I usually get when I look up at tall buildings so allows me to actually enjoy every part of the picture without feeling a bit queasy!
It's really nice exposed too - there's pure white and pure black in there, so the tones look balanced and considered, just as they should for such a technically defined subject