What was neudeck and why was it more than just an 80th birthday gift to paul von hindenburg?

First of all, you should know who Paul von Hindenburg was. He was a famous German officer, statesman, and politician during WWI. For his many contributions during the war, he was rewarded with Neudeck. Neudeck was an estate that once belonged to his family in the past. Now, it was found in East Prussia, but he was given it as a gift nevertheless to honor his eightieth birthday.