That's well described, I can really imagine myself in that dream.
I think different buildings can represent diefferent parts of your unconscious, just like different rooms in a house can do the same, depending on what the buildings are. Do you know what the buildings were used for?
I know fire can be good or bad depending on what it's doing, which I guess is being kind of distructive in this case - like some aspect of your life represented by the buildings is causing a lot of distructive worry or stress. Maybe you are either hoping to avoid these situations or your subconscious is trying to tell you to avoid them, take a detour or find a less stressful way to deal with them.
I think because one of the buildings is only smoking at the moment that it may suggest the possibility, or potential for stress in that area.
I guess you've thought about most of this already though, I know you're pretty good at this stuff so I don't want to suggest too much.
