Oh, if you are browsing through the Berliner Adresskalender - could you possibly check a) where Lehndorff lived in 1756, and b) whether he still lived there in 1759? Because yes, I'm still curious as to whether his wife was exposed to the phosphor inscription on the wallpaper. :) Mind you: given all the constant evacuations of the court to Magdeburg, there might not be a Kalender for the 7 Years War time, but maybe you could check?