Dear Woodpeck
I will try to:
1) Retrieve the track that I recorded 
2) Check in the OSM map if indeed it goes over the building (I vaguely recall walking near a building but surely not over it :oD)
3) Try to remember on which paper map I had seen the track (that might take some time).
I’m away from home now though, but I will be back on Monday and I will try to do that at the beginning of the week. 
Could you just remind me how I can upload or send you both the track and the photo ?
Thank you