It is quite obvious: The Yankees marched in and they try to sell away the bricks. Dusseldorf was just renovated, Dresden is a top location and a AAA real estate. I am sure they will continue to manage both. Well, Weimar? They could try to give that away, it does not really fit into the brand.
And about the geographical presence: I can only speak for Munich. To my recollection, the Park Hilton used to be part of the US group whereas the City Hilton was part of London.