i am just a few days here , ähm ... i come from Schleswig-Holstein , near Kiel .
In the neighborhood of my home village is a village names "Schinkel" , near Kiel too .
There is a big Farm called "Gut Rosenkrantz" , i dont know about the owner but maybe thats what you are search . Maybe you get Information at the townhall in "Gettorf" , postcode : 24214 , Schinkel has the same postcode and perhaps there are documents about Rosenkrantz Family .
greets from north germany :-)