Nature versus man-made. I'd say that nature is winning here. Notice it looks like someone tried to patch the bricks to the left of the tree trunk in a perpendicular pattern before apparently giving up and just smearing on a bunch of mortar. This is a vacant building which I don't think can be saved at this point.
Today is the first of June (hard to believe!) and that means Theme Day in the City Daily Photo Community. To check out things decaying beautifully around world, click here.