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This is the front room, garden level, of a brownstone, facing the street. I’ve had 2 mason-type people come to look. It must be unclear what the problem is and is maybe too small a job. The theory is that there is a leak, but no one knows from where….but it has to be from front of building. Does anyone have any experience with this, or know someone with lots of brownstone experience willing to do a smaller job? Thanks!