This photo "shows the orange sign erected by the company which now uses the farm. It is called KWS, short for Kleinwanzlebener Saatzucht, a plant breeding and seed producing company based in Einbeck, Germany. At Seligenstadt it has run a Breeding Station since 1946 (according to what I have read)."
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This image "shows the entrance pillars to the farm."
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"The building straight ahead on the left-hand side contains the office where visitors are greeted."
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"Opposite the building with the office you see this view. There are buildings on all four sides of a kind of yard with these lovely chestnut trees in the centre." (Here's Mom standing outside of that building.)
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"Turning
left after the gates you get the view with the car parked on the left."
Thanks
to Commenter Di for making these photos available to us.