Does anyone know anything about property restitution in the former Yugoslavia?

My father's family fled from their family home in Igalo on the Mediterranean coast of Croatia during WWII. They lost everything and came to the U.S. to start over. Now he has been given a chance to reclaim what is rightfully his, the house his father built on the coast, through the property restitution program recently enacted by the government there. He has a lawyer over there who has been helping him through the process. He has vital doents like the deed as well as tesimony from other families in the region. But someone doesn't want him to suceed. He has been working on this for over a year and found out last week that the state is planning to put the house up for auction soon. They are trying to stop him before the fair legal process has run its course. The house in amazing and has been a vacation spot for wealthy country leaders for decades, and it seems they are fighting to keep it. Does anyone know more about this property restitution process and what else he could do?