The situation is the same for national marine conservation areas and national parks. Rights have to be respected. Usually, we approach the owners of those rights to buy them back. In some cases, people ask for the market price. In other cases, the rights are simply donated. Elsewhere, it might also be possible to use other tax incentives that are not related to national parks like the Ecological Gifts Program, for instance.
On June 8th, 2010. See this statement in context.