You can expect to pay anywhere from $200/sf and up. The sky's the limit and it depends largely on your budget, tastes, requirements and financial capability. As an example a very powerful financial icon and guru recently purchased a China Cove property next door to my mother-in-law for $14 million and put another $12 million into a remodel. Does this give you an eye opener. You're dealig with some of the priciest RE in the world. Expect to pay accordingly.