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Our building is developing quite the case of “mossiness” on the brick (north facing) facade. Is this any cause for concern? Does it damage the brick if we let it go? It seems to have gotten worse in the last few years, and I’m not sure what to do about it. I personally am not a big fan of the way it looks but I’m more concerned about the integrity of the bricks and mortar. Anyone have any experience with this? Thanks.