Owner: Paul Allen
Estimated value: $13.5 million
Microsoft co-founder and billionaire investor Paul Allen listed Allan Island, which he bought in 1992, for sale in August last year at $13.5 million. The 292-acre island has been on and off the sale block since 2005, when the initial asking price was $25 million.
The island, named after a Navy hero, is located in the San Juans archipelago in the Pacific Ocean, off the coast of Anacortes, Washington. Allen had reportedly bought the island to build a vacation home, but instead purchased land on nearby Lopez Island in 1996 to build the home. The island is mostly underdeveloped with just a log caretaker's cabin, a dock and a 2,400 feet grass airstrip.
And there's a big drawback: the island has no electricity, and it would cost a reported $3 million to pipe power in , according to the island's property agent.