Simply stunning shot. At first glace it is symmetrical, the two open windows and the parallel lines in the radiators but then you see the asymmetric details between the two halves. I think the green foliage on the left is somehow balanced by the frosted white of the windows on the right.
The muted tones give the whole thing a very surreal beauty. The decay and miscellaneous bits of nitty gritty add to the grunge factor, yet it's not cluttered.
I also like that the doors within the doorway are perfectly framed, even though one is further back. I enjoy a good fading perspective, but in this case the closed doors work for the whole image.