Finally had phone contact with the bike owner tonight and have made arrangements to look at the old WW2 BMW next week.
The currant owner purchased 90+ acres of forested CA. property a couple years ago. The previous owner had collected junk for a life time and filled the property with old "stuff". The present owner has spent the past year just clearing junk off the property.
The old BMW / sidecar in question was stored inside an old semi tractor trailer for who knows how long.
His care taker on the property has been reorganizing things so hopefully the old bike / sidecar is all there and accounted for.
I am truly looking forward to the archeological "dig' next week.
I'll be sure and take my camera...and probably my checkbook too....