The Casa Marina Area is named after the Casa Marina Resort which was the first hotel built in Key West. It was built by Henry Flagler right after he completed the Flagler Railroad. The Casa Marina Area is known as being one of the most expensive sections of Key West. It is very unlikely you will find any house under $1,000,000 in the Casa Marina Area and many of the homes will sell for $4,000,000 and up. The Casa Marina Area somewhat has the best of both worlds. You can walk to the beach and Duval Street. It is close enough to Duval Street to be an easy walk but far enough away to still be quiet.