You are right on both counts. During renovations, a concealed trap door was discovered that led to the basement. A false wall was removed and the tunnel was found on the east side of the building. It starts as brick and then turns to a framed mine like tunnel. I believe it went to a house next door that is no longer there. It is partially collapsed.
The wallpaper was handpainted by a French artist and there is only one other copy remaining in the world. It is quite valuable.
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