This is what I see when I look at the backyard
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Otto, I mostly see the same things you're seeing, but what do you think about that white exterior door? If you look at the other pic posted by Johan555 recently and that I've commented on a few times, do you think that door might be on the second level? It kind of looks like it to me, but maybe there are doors on both levels? The pile of leaves out in front of the door, particularly in Johan555's post, makes me think it hasn't been used in awhile, but hard to say.