"The Mansion on the Sea in Key West" paints a vivid picture of a luxurious residence situated on the shores of Key West, Florida. Let's delve into the descriptive details of this picturesque scene:

**1. Coastal Architectural Splendor:**
   - The mansion exhibits exquisite coastal architecture, combining the charm of Key West's historical designs with modern luxury. It might feature wrap-around verandas, pastel hues, and classic elements that define the island's unique style.

**2. Oceanfront Elegance:**
   - Nestled directly on the oceanfront, the mansion enjoys a prime location with unobstructed views of the azure waters surrounding Key West. The strategic placement enhances the allure of the residence, making it a haven for those who appreciate waterfront living.

**3. Tropical Gardens:**
   - Immaculately landscaped tropical gardens surround the mansion, filled with vibrant flora native to the Florida Keys. Palm trees, bougainvillea, and hibiscus contribute to the lush and inviting atmosphere.

**4. Infinity Pool with a Sunset View:**
   - An infinity pool graces the mansion's grounds, seamlessly blending with the horizon. Positioned strategically, the pool offers an ideal vantage point for residents to witness the breathtaking Key West sunsets over the Gulf of Mexico.

**5. Private Pier and Boat Dock:**
   - A private pier extends into the clear blue waters, equipped with a boat dock. This feature allows residents to embark on maritime adventures or simply enjoy the serenity of the sea from the comfort of their own estate.

**6. Coastal Chic Interior:**
   - The interior of the mansion exudes coastal chic elegance. Nautical elements, such as marine-themed decor, sea-inspired artwork, and a light and airy color palette, create an ambiance that resonates with Key West's laid-back yet sophisticated style.

**7. Breathtaking Sunset Verandas:**
   - Multiple verandas and balconies provide intimate spaces for residents to relish the iconic Key West sunsets. Each veranda is thoughtfully furnished, inviting occupants to unwind and soak in the picturesque views.

**8. Historic Charm:**
   - Infused with the historic charm characteristic of Key West, the mansion might boast features like charming shutters, intricate railings, and architectural details reminiscent of the island's storied past.

**9. Panoramic Windows:**
   - Floor-to-ceiling windows grace the mansion's living spaces, offering panoramic views of the sea. The design allows natural light to flood the interior while providing uninterrupted sightlines to the picturesque seascape.

**10. Coastal Lifestyle Amenities:**
    - The mansion is equipped with amenities that enhance the coastal lifestyle, including a private beachfront, outdoor lounging areas, and perhaps a gazebo or tiki bar for entertaining guests in true Key West fashion.

**11. Secluded Tranquility:**
    - Despite its luxurious features, the mansion maintains an air of secluded tranquility. Tall fences or lush vegetation offer privacy, creating an intimate retreat where residents can escape the world and embrace the serenity of the sea.

In this portrayal, "The Mansion on the Sea in Key West" embodies the epitome of coastal luxury, seamlessly blending architectural sophistication with the laid-back charm of the Florida Keys. It stands as a testament to the allure of oceanfront living in this vibrant and tropical island paradise.