Landmark Palm Beach Megamansion Is Listed for an Eye-Watering $175 Million After 5-Year Makeover

A landmark Palm Beach megamansion built in 1928 and designed by architect Addison Mizner has hit the market for a staggering $175 million after being completely reimagined.

The 15-bedroom estate, known as Casa del Ensuenos, is nestled in the Estate Section, minutes away from President Donald Trump's Mar-a-Lago. Businesswoman Ann DesRuisseaux purchased the property for $24 million in 2020 and has spent the past five years renovating the space.

Spanning 21,534 square feet and offering 200 feet of frontage along the Intracoastal Waterway, the stunning home has made a splash at the top of this week's most expensive homes list. It is also one of eight Florida properties to make this week's list.

Found inside the over-the-top residence are an elevator, eight fireplaces, a chef's kitchen, and a primary suite with dual bathrooms.

The 1.42-acre property boasts other eye-popping amenities, including a sunken tennis court, a tennis pavilion, a boathouse, a performing arts theater with a stage, a new seawall, private docks with a boat lift, and a six-car garage. A covered loggia overlooks the heated infinity pool.

More jaw-dropping estates to make the week's most expensive homes list include a waterfront residence at the Four Seasons Resort and Residences Puerto Rico with four casitas, a neo-Federal estate on Manhattan's Upper East Side, and a "mostly furnished," newly completed Manalapan mansion.

10. 84 LA Gorce Cir, Miami Beach, FL

Price: $39,000,000

La Gorce Island: This five-bedroom waterfront estate is nestled on the 24/7 guard-gated island enclave and boasts 100 feet of water frontage.

Built in 1960, the 5,364-square-foot residence is being offered as a teardown opportunity to "design and build a custom modern waterfront estate." While no interior photos are included with the listing, the property does feature a pool, two-car garage, and deep-water boat dock.

The nearly half-acre lot offers spectacular views of Biscayne Bay.

Jonathan Alfonso of eXp Realty LLC is the listing agent.

9. 12 Las Estancias, Rio Grande, Puerto Rico

Price: $42,500,000

Four Seasons Resort and Residences Puerto Rico: This nine-bedroom compound on 1.7 acres boasts a primary residence, three guest casitas, and a wellness casita with a sauna and massage room.

Offering views spanning a secluded beach, the 17th hole of the Trent Jones Jr.–designed golf course, and the Audubon International Nature Reserve, the private 10,967-square-foot estate is surrounded by Hong Kong orchids and lush landscaping. The primary residence features a double-height atrium with water features, a home office, library, media room, and an Atlantic Ocean-facing primary suite with a private terrace occupying the entire second floor, overlooking the pool.

An $1,865 monthly association fee provides access to the resort's amenities, including sport courts, a beach club with oceanfront pool, and two miles of beaches.

Margaret Pena Juvelier of Puerto Rico Sotheby's International Realty is the listing agent.

8. 6315 S Flagler Dr, West Palm Beach, FL

Price: $42,500,000

New construction: This seven-bedroom waterfront mansion overlooking Palm Beach Island is slated for occupancy at the end of January 2026.

Offering a front-row view of the Intracoastal Waterway, the stunning estate boasts two full designer kitchens, a media room with stadium seating, a spa, a wine room, and a corner primary suite encased in glass to soak in the views. Outdoors, there is a second-story pool with a spa, multiple cooking areas, and a cocktail bar.

It also has a 100-foot, deep-water dock designed to accommodate large yachts.

Hilary Musser of Hilary Musser Real Estate LLC is the listing agent.

7. 125 65th St, Manhattan, NY

Price: $45,500,000

35-foot-wide mansion: This Upper East Side, neo-Federal estate was built in 1910 and originally designed by architect Charles A. Platt, who also worked on homes for the Roosevelts and Astors.

The six-bedroom brick residence has been meticulously renovated after a gut renovation. Period highlights throughout the six-level home include beamed ceilings, a dining room with seating for 16, and five fireplaces.

Modernizations include all new systems, an elevator, herringbone oak floors, a full-floor primary suite with dual baths, separate staff quarters, a wellness level with a cold plunge, a fitness center, a wine cellar/tasting room, and a media room.

There is also a roof deck and a private courtyard patio.

Melissa Post of Serhant is the listing agent.

6. 6 Riverview Rd, Jupiter Island, FL

Price: $49,000,000

Intracoastal frontage: Built in 1962, this seven-bedroom mansion offers 454 feet of water frontage along with a private beach.

Featuring 7,958 square feet of midcentury space with wood-clad walls, parquet floors, and floor-to-ceiling glass walls, the residence also boasts a cozy living room with a fireplace, a dining room with access to a patio, and a library with built-in shelves. The 1.72-acre property also has a pool and several outdoor patios.

There is also an opportunity to expand the property by an additional 2,486 square feet of space, according to the listing.

Adrian Reed of William Raveis Real Estate is the listing agent.

5. 1413 N Venetian Way, Miami, FL

Price: $59,900,000

Venetian Islands: This brand-new estate offers stunning skyline views, 105 feet of water frontage, a new deep-water dock, a boat lift, and direct access to Biscayne Bay.

The seven-bedroom contemporary offers 12-foot ceilings, glass walls, dual kitchens, a screening room, an elevator, and a rooftop deck. Also found throughout the curated 10,689-square-foot "trophy estate" are Brazilian closets, smart home automation, and hardwood and marble floors.

The seaside lot offering "high-end waterfront living" also has a 70-foot, knife-edge pool with spa, a summer kitchen, and an "understory" designed to accommodate 10 vehicles.

Matthew Crane of Compass is the listing agent.

4. 10203 Collins Ave Unit 2801, Bal Harbour, FL

Price: $75,000,000

Oceana Bal Harbour: This sprawling six-bedroom "crown jewel in the sky" boasts a two-story interior full of lavish amenities.

Built in 2017, the corner penthouse is surrounded by floor-to-ceiling windows to take in the jaw-dropping views from the Miami skyline to Biscayne Bay and beyond. A private elevator opens to the 8,993-square-foot residence, which features an enormous dining room, a home office, a media room, and an ocean-facing primary suite with a sitting room, soaking tub, and access to a wraparound terrace.

A 7,000-square-foot rooftop terrace has a private pool, hot tub, outdoor kitchen, and numerous spots to lounge and entertain.

Joaopedro Estrada of MC Miami Realty LLC is the listing agent.

3. 1100 S Flagler Dr Unit 2401/2402, West Palm Beach, FL

Price: $78,900,000

The Bristol Condominium: This 14,502-square-foot waterfront penthouse is said to be owned by the estate of the late Matrix Essentials hair-and-beauty mogul, Sydell Miller.

Miller purchased two top-floor condos for $42.56 million in 2020 and transformed them into one sophisticated residence. The "breathtaking estate in the sky" now features a dramatic foyer, waterfront living room, a family room with a wet bar, and a library with built-in shelves. Also found throughout the five-bedroom residence are a chef's kitchen with a butler's pantry, a staff corridor with a security room, and a primary wing with a hair salon and massage room. A wraparound terrace offers panoramic views of the Intracoastal Waterway, Atlantic Ocean, and downtown West Palm Beach skyline.

There is also a private two-car garage, along with additional space found in the main garage.

Christian Angle of Christian Angle Real Estate is the listing agent.

2. 1260 S Ocean Blvd, Manalapan, FL

Price: $85,000,000

Recently completed: This eight-bedroom mansion was completed in 2024 and offers 155 feet of ocean frontage.

Offered "mostly furnished," the 19,023-square-foot residence known as Saltbox spans three levels of luxurious living. A two-story, glass entry door opens to a spacious floor plan surrounded by oversized windows. Lavish amenities include a billiard room, built-in bar, tiered movie room, bunk room, fitness center, and primary wing with a fireplace, dual bathrooms, boutique-inspired closets, and covered terrace.

The 1.46-acre property, which stretches from the Atlantic Ocean to the Intracoastal Waterway, also has a covered patio with an outdoor kitchen, a pool with a hot tub, an eight-car garage, and a concrete boat dock with a beach.

Jack Elkins of William Raveis Real Estate is the listing agent.

1. 800 S County Rd, Palm Beach, FL

Price: $175,000,000

Casa del Ensuenos: This waterfront megamansion overlooking the Intracoastal Water boasts private docks with a 40,000-pound boat lift, a sunken tennis court, a tennis pavilion, and a boathouse.

The 15-bedroom legacy estate offers a massive 21,534 square feet of gut-renovated space that is just coming off a multiyear reimagination. Opulent details found throughout the "one-of-one" residence tucked away in the Estate Section include a covered loggia, a performing arts theater with a stage, eight fireplaces, and a heated infinity pool.

A six-car garage can also be found on the 1.42-acre property.

Margit Brandt of Premier Estate Properties–Palm Beach is the listing agent.