Obtain a demolition order against yourself?

Yes, a condition of the monument protection is that demolition is only permitted if the property is subsequently rebuilt with a residential building. However, I cannot guarantee this as I just want to sell the property.

Have you ever specifically asked a structural engineer?

Yes, I have, to stabilize the barn structurally one would have to work on it, which the owner does not allow.

Can you perhaps sell the property to the other party?

You can definitely ensure that via building commitment, let's say 36 months plus reversion in the sales contract. Municipalities sell like this all the time. Karsten

You can certainly ensure that via building obligation, let's say 36 months plus reversion in the sales contract. Municipalities sell like this all the time. Karsten

Who would buy that? No one with a troublemaker on their neck.