Roger, ancient cities such as Paris, Berlin, Rome, and London often have limestone buildings. Due to environmental and weather conditions, these are subject to discoloration. That is why I endorse what Kathy says above. Thanks to the by you used editing method, you have given this, perhaps Californian, building the same appearance. Perfect piece of work!
If you think you can't accept something, try to change it. But if this doesn't work, don't be frustrated, but give it later another try. The one who perseveres wins!
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