What a neat place. Not cool that it's falling down I guess, but as a photographer it is certainly a subject worth exploring. Hope you grabbed some other angles/compositions at this location...
The pine tree growing over the building adds a neat leading diagonal line to this. Another angle that might have worked is a portrait oriented shot with the far right of the building isolated to include the tower. Just a thought.
I like this photo and the way that nature seems to be reclaiming humankind's leftovers. The main negative I have on this is the shadows on the lower front of the building - I would have preferred them not to be there ... but that's just personal preference really; others might look upon it as more sinsiter or more suggestive of the building being surrounded.
I like the composition but I am not sure about the colours or the contrast - maybe a little more of both? the wall on the right also looks a little over exposed - but... still like it a lot!