If you have $8.6 million sitting around, you could buy your choice of any number of posh penthouses in Miami, or you could look a bit farther south and buy your own private island. An island dubbed East Sister Rock just off the coast of Marathon is on the market. It comes complete with a 5,000-square-foot home that's powered by wind and solar energy. 

The island has been on and off the market since 2011, when it was originally listed for $12 million, according to Curbed Miami. It was recently re-listed at the reduced price. (However, if you're interested, you can also rent the island for about $1,000 a night.)

The island is a three-minute boat ride from mainland Marathon (and about a two-hour trip from Miami). You can also travel there via helicopter thanks to the helipad on the premises. Though, that's probably not the most sustainable means of regular transport. 

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The circular island is surrounded by a coral reef and is located near many choice fishing areas. 

The house, built in 1980, has three bedrooms, two bathrooms, and 2,500 square feet of veranda space, allowing 360-degree views of the ocean. The Bahama-style house sits 15 feet above sea level and features hardwood floors throughout. A guesthouse provides another bed and bath. 

It's basically the luxury ideal of off-the-grid living. 

• Real Estate