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$18,500,000

For Sale

3 days ago

631 N Mashta Dr, Key Biscayne, FL

House

MLS® B26058354

4 Bed

5 Bath

2255 sqft

8 Parking

  • Key Facts
  • Description
  • Rooms
  • Map

Key Facts

Type Single Family Residence
Levels Residential
Size 2255 sqft
Garage 
Taxes $112,485
Days Active 4
Lot Size 0.34 Acres
Approx. Age 1958
Avg. Price Per Sqft $8,203
MLS® Number B26058354

Property Address: 631 N Mashta Dr, Key Biscayne, FL, 33149-1720

Average square foot calculated using Size range provided by listing agent.

Description

BRING ALL OFFERS! Exceptional waterfront opportunity in prestigious Key Biscayne. Set on a 15, 000 sq. ft. lot with 100 feet of water frontage, this residence offers open-water views, direct Biscayne Bay access, and no fixed bridges to the ocean. Currently undergoing a complete renovation, it will feature modern finishes, impact windows and doors, new systems, spacious living areas, a chef's kitchen, and luxurious bathrooms. Enjoy a private dock, deep-water access, pool, breathtaking sunsets, and an unmatched boating lifestyle in one of South Florida's most desirable communities One of the most compelling waterfront opportunities currently available in all of Key Biscayne. Perfectly positioned on the exclusive and highly coveted Mashta Island, this exceptional property offers approximately 100 feet of prime waterfront, deep-water dockage, direct Biscayne Bay access, and no fixed bridges to the Atlantic Ocean, creating an unparalleled opportunity for boating enthusiasts and yacht owners. Mashta Island has long been recognized as one of South Florida's most prestigious residential enclaves, offering exceptional privacy, quiet tree-lined streets, oversized waterfront estates, and immediate access to the open waters of Biscayne Bay while remaining only minutes from Brickell, Downtown Miami, Coconut Grove, Coral Gables, Miami Beach, and Miami International Airport. Very few neighborhoods offer this combination of island living, security, boating lifestyle, and proximity to the city's financial and cultural centers. The residence is currently on renovation designed to transform the property into a contemporary waterfront estate while preserving the exceptional value of its location and oversized waterfront parcel. This is substantially more than a cosmetic renovation. The project includes major improvements throughout the residence, including redesigned living spaces, upgraded electrical and plumbing systems, new HVAC equipment, impact-resistant windows and doors, premium flooring, modern architectural lighting, designer finishes, and a completely reimagined interior intended to meet today's luxury lifestyle expectations. Upon completion, the home is anticipated to offer spacious entertaining areas, beautifully appointed bedroom suites, bathrooms, an impressive chef's kitchen featuring custom cabinetry, premium appliances, elegant countertops, and thoughtfully designed indoor-outdoor living spaces that maximize the spectacular waterfront setting. The property's exceptional orientation provides beautiful water views and unforgettable sunsets while creating an ideal environment for entertaining, family gatherings, and year-round outdoor living. The expansive backyard offers generous space surrounding the swimming pool together with multiple areas for outdoor dining, lounging, and enjoying the waterfront lifestyle that has made Key Biscayne one of the most desirable residential communities in South Florida. For boating enthusiasts, few properties can offer the combination of oversized waterfront, private dockage, deep-water access, and unrestricted navigation to Biscayne Bay and the Atlantic Ocean without fixed bridges. Whether accommodating a large sport yacht, cruising yacht, center console, or multiple vessels, the waterfront configuration provides flexibility rarely available in today's market. Key Biscayne continues to be recognized as one of South Florida's most exclusive island communities, celebrated for its pristine beaches, excellent schools, private clubs, marinas, tennis facilities, parks, bicycle paths, restaurants, and relaxed coastal lifestyle. Residents enjoy the unique advantage of living within a peaceful island environment while remaining only a short drive from Miami's world-class shopping, fine dining, cultural institutions, private airports, international business centers, and professional sports venues. The supply of premium waterfront homes on Mashta Island remains extremely limited due to the neighborhood's est
MLS® NumberB26058354
Laundry LevelEnsuite
Central VacNo
FireplaceNo
Acreage
Exterior
Garage
Approx. Age1958
Basement
DrivewayAttached Carport, Circular Driveway, Carport, Driveway
Garage Spaces
HeatCentral, Electric
A/CCentral Air

Extras

Rooms

Kitchen:Main Floor11 × 12 ft
Bedroom 1:Main Floor20 × 25 ft
Living Room:Main Floor22 × 16 ft
Dining Room:Main Floor14 × 12 ft

Price History

-End Date
Not Sold YetSold Price

For Sale

Jul 30, 2026List Date
$18,500,000List Price

Home Appraisal

This property is estimated to sell between: $8,875,000 and $23,313,000.
Similar properties in this area sold on average for: $8,875,000
Expected to sell in 84 days. Similar properties sold in 88 days. This home has been on eXp Realty for 4 days.

The estimated sale price does not take into account many variables such as recent renovations, type of appliances, school district etc. To get a more accurate estimate please contact agent.

  • Commute

Commute

Starting Address
Destination Address
631 N Mashta Dr, Key Biscayne, FL

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