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I believe it when I see a photo of the property & them there. Sometimes this celebrity-buzz around a project are a way to sell something that doesn´t sell well. You would be surprised how many luxery apartments in f.e. Amsterdam were 'bought' by either Madonna or Brad Pitt
I believe Caroline of Monaco and her family go to Comporta each summer?
Although I find Melides and Portugal wonderful,
I am not sure if they are better of there than in California. the sea is ice cold and there tend to be lots of wind on the beach. The food will be much better of course. A big plus in comparison to other beach areas of much of Southern Europe and certainly of the Iberian peninsula would be that properties tend to be secluded and the area is quiet and not ruined by construction.