San Francisco Bay's only private island is on sale for $25 million — but there's a catch

• San Francisco Bay's only private island is on the market for $25 million
• Red Rock Island lacks basic infrastructure like power and running water. 
• Owner Brock Durning wants to sell the island as he hasn't visited in several years.

San Francisco Bay's only private island is on the market for $25 million — but there's no electricity or running water, reported The Wall Street Journal.

Red Rock Island is six acres in size and only accessible by boat or helicopter, the island's listing agent Chris Lim told WSJ.