My best guess would be that the state would claim original ownership of the new land. If you take a small coastal lot and then start building landfill out into

My best guess would be that the state would claim original ownership of the new land. If you take a small coastal lot and then start building landfill out into the ocean you are going to have a hard time convincing the state that you own the property without some pre-existing contract with the appropriate regulatory bodies stating this when you started construction.