Brickell Key is a man-made island off the mainland Brickell neighborhood of Miami, Florida. Also called Claughton Island, the neighborhood is just east of Downtown Miami and the Miami River. In 1896, Henry Flagler organized a 9-foot deep channel dug from the Miami River mouth, creating two islands in the process. In 1943, Edward N. Claughton, Sr. bough…Brickell Key is a man-made island off the mainland Brickell neighborhood of Miami, Florida. Also called Claughton Island, the neighborhood is just east of Downtown Miami and the Miami River. In 1896, Henry Flagler organized a 9-foot deep channel dug from the Miami River mouth, creating two islands in the process. In 1943, Edward N. Claughton, Sr. bought the Brickell Key islands and other land to combine them into a 44-acre triangle-shaped tract. In the late 1970s, Swire Properties bought most of the island from Claughton. Since then the island has been built out with some of the tallest buildings in Miami, and the Mandarin Oriental, Miami hotel, mainly during the condo "Manhattanization" wave of the 2000s.