Fisher Island, a man-made island off the coast of Miami, is the richest zip code in the US, according to Bloomberg.

The average income of the island's residents is a whopping $2.2 million.

To become a member of the elite Fisher Island Club , you must pay a one-time $250,000 equity contribution and $22,256 in annual dues. And that's after residents have bought one of the condos on the island, which cost an average of $3.2 million. About 700 families live on Fisher Island in almost 30 luxury condominium buildings.

Dora Puig, the top-ranked real estate broker in Miami-Dade County by sales volume in 2018, who sells some of the most luxurious condos on Fisher Island, told me people move there for three main reasons: privacy, security, and the amenities.

Residents of the island include real-estate developers, high-power litigation attorneys, CEOs, people in the finance industry, and some who are simply "old money," Puig said.

Tech CEOs and hedge-fund managers from New York, Silicon Valley, and other high-tax areas are moving to Miami in droves, and highly amenitized Fisher Island is one of their top picks.

Read more : NYC hedge-fund managers and Silicon Valley CEOs are flocking to Miami as 'tax refugees,' and it's sparking record, ultra-luxury real-estate sales in the area

Members of the Fisher Island Club get access to private beaches with sand imported from the Bahamas, a beach club, eight restaurants, a golf course, two deep-water marinas, a spa, 18 tennis courts, and more. The marina's boat slips are "highly coveted" and will cost you a minimum of $125,000 and potentially well into the millions, publicist Lauren Marks told me.

The island also has its own fire and rescue station, medical facility, bank, mail facility, dog park, and even an independent day school with students from age 2 through seventh grade. About 600 employees work on the island. And because only about 30% of residents live there year-round, that means there are often more employees on the island than residents, Marks said.

I got the chance to take a tour of Fisher Island on a recent afternoon. Here's a look inside the super-exclusive community.

See the rest of the story at Business Insider

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SEE ALSO: NYC hedge-fund managers and Silicon Valley CEOs are flocking to Miami as 'tax refugees,' and it's sparking record, ultra-luxury real-estate sales in the area

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