The Mansion On The Sea

The Mansion on the Sea, formerly known as the Southernmost House, officially changed it's name on July 1, 2023. We are an historic, oceanfront property located at 1400 Duval Street, in Key West, Florida, and remain the Southernmost House in the continental United States. Operating since 2006 as an 18 room guesthouse, we offer 9 rooms in the Main house, 3 bungalows, a cottage and 4 rooms and full size apartment in the Lopez House, directly across the Pocket Park from the Mansion. Preserved to retain our original history, but updated to provide our guests with all the modern conveniences you'd expect to find in the most luxurious hotels available in an island paradise such as Key West, we are The Mansion on the Sea. We are an all-adult guesthouse, and require all hotel guests to be at least 18 years of age. Our front desk is available to take reservations 7 days a week from 8:00 a.m. until 10:00 p.m.