The building are catching the last energy of the photons. Two more minutes and it was pitch black with only the windows overexposed. You do not get such a light every day. It takes some luck and some patience. If you really want to have this sort of atmosphere, the best bet is to come there every evening just before sunset and wait. Photography is like going fishing. But for that you have the feeling of wasting a lot of time waiting. Some like it, some don't. I don't particularly enjoy lingering in one place for a time, coming back everyday in the hope of getting the right light. I am too impatient. And sometimes, you have to be impatient and restless to get what you want.