Home in 631 N Mashta Drive, Key Biscayne, FL 33149 for sale with MLS# B26058354
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 established character and finite number of waterfront parcels. As a result, opportunities to acquire large waterfront lots with substantial dockage and direct ocean access continue to be highly sought after by both domestic and international buyers. The combination of location, waterfront dimensions, boating accessibility, oversized lot, and comprehensive renovation creates a property with exceptional long-term appeal. Showings are strictly by appointment with the Listing Agent.. All measurements, dimensions, lot size, square footage, waterfront frontage, dock dimensions, room sizes, zoning, taxes, permits, specifications, plans, renderings, and property information are believed to be accurate but are not guaranteed and should be independently verified by Buyer. Renderings, conceptual plans, floor plans, specifications, and construction updates are available upon request when applicable. This offering represents an extraordinary opportunity to secure one of Key Biscayne's waterfront residences . Whether as a primary residence, seasonal retreat, or long-term investment, this property combines one of South Florida's most desirable locations with an outstanding boating lifestyle and exceptional future value. Bring All Offers.
631 N Mashta Drive, Key Biscayne, FL 33149
- Price:
- $18,500,000.00
- Original List Price:
- $18,500,000.00
- List Price per Sq Ft (Calculated, Approx.):
- $8,203.99
- Listing Type:
- For Sale
- Status:
- Active
- Special Sale Conditions:
- Standard
- Listing Category:
- Residential
- Property Type:
- Single Family House
- Description of Last Important Update:
- New Listing
- Last Major Update on:
- July 30, 2026 6:40 pm
- Bedrooms:
- 4
- Bathrooms Total:
- 5
- Full Bath:
- 4
- Half Bath:
- 1
- Room Type:
- Dining Room, Kitchen, Living Room, Master Bedroom
- Master Bedroom Bath:
- Dual Sinks
- Dining Area:
- Dining/Living Room
- Living Area:
- 2,255 Sqft
- Built-Up Area:
- 3,720 Sqft
- Building Area Source:
- Public Records
- Living Area Source:
- Public Records
- Lot Size Acres:
- 0.34
- View from the Property:
- Pool, Water, Bay, Intracoastal
- Waterfront:
- Yes
- Waterfront Features:
- Ocean Access, Navigable Water, Seawall, Bayfront, No Fixed Bridge, Intracoastal
- Frontage Length:
- 100
- Private Pool
- Swimming Pool Features:
- In Ground, Equipment Included
- Furnished:
- Unfurnished
- Appliances:
- Dryer, Dishwasher, Microwave, Refrigerator, Washer, Cooktop, Electric Water Heater, Water Heater, Wine Refrigerator, Oven, Energy Star Qualified Refrigerator, Energy Star Qualified Washer, Energy Star Qualified Dishwasher, Free-Standing Freezer, Energy Star Qualified Dryer, Electric Cooktop, Energy Star Qualified Freezer
- Interior:
- Walk-In Closet(s), Entrance Foyer
- Exterior:
- Garden, Private Rooftop Terrace
- Patio and Porch:
- Patio, Patio - Covered, Patio - Open
- Windows:
- Storm Window(s)
- Laundry:
- Inside, Laundry Room, Sink
- Green Energy Efficient:
- Appliances, Hvac
- Air Conditioning
- Air Conditioning System:
- Central Air
- Heating
- Heating System:
- Central, Electric
- Boat and Dock Features:
- Private Dock, Electric Available
- Property Entrance Faces:
- East
- Storm Protection Impact Glass:
- Complete
- Sprinkler Description:
- Auto Sprinkler, Zoned Sprinkler
- Year Built:
- 1958
- Roof:
- Shingle
- Levels:
- Two
- Construction Materials:
- Brick, Concrete
- Flooring:
- Tile, Laminate, Concrete
- Number of stories:
- 1
- Structure Type:
- House
- Stories:
- 1
- Flood Zone Code:
- AE
- Property Condition:
- Resale, Updated/remodeled
- Tax Annual Amount:
- $112,485.00
- Tax Year:
- 2025
- Property Tax Details:
- City/County
- Parking Total Spaces:
- 8
- Carport Spaces:
- 2
- Covered Spaces:
- 2
- Parking Features:
- Driveway, Circular Driveway, Attached Carport, Carport
- Carport
- Sewer:
- Public Sewer
- Utilities Available:
- Electricity Connected, Sewer Connected, Water Connected
- Water Source:
- Public
- Membership Details:
- No Membership Available
- Pets Allowed?:
- Yes, No Restrictions
- Subdivision Name:
- MASHTA ISLAND
- Senior Community:
- No
- Restrictions:
- See Remarks
- Community Dock
- Listing Terms Considered by Seller:
- Cash, Conventional
- Buyer Possession:
- Negotiable, Close Of Escrow
- Tax Legal Description:
- MASHTA ISLAND PB 60-93 LOT 7 BLK 1 LOT SIZE 100.000 X 150 OR 17980-3315 0198 4
- Real Estate Folio Number (Parcel Number):
- 2452050080070
- Zoning:
- 2001
- Elementary School:
- Key Biscayne K-8
- High School:
- Coral Gables
- Middle Or Junior School:
- Ponce De Leon
- Active on the market since:
- July 30, 2026
- Listing Agreement executed on:
- July 29, 2026
- Listing Status Last Changed On:
- July 30, 2026 6:40 pm
- Photos updated on:
- August 4, 2026 2:57 pm
- Last Modified:
- August 5, 2026 6:37 pm
- Courtesy of:
- Coldwell Banker
- Attribution:
- Not provided
- Street Name:
- Mashta
- Street Number:
- 631
- City:
- Key Biscayne
- State:
- Florida
- Zip Code:
- 33149
- County:
- Miami-Dade
- Latitude:
- N25° 41' 9.3''
- Longitude:
- W81° 49' 33.7''
- Street Suffix:
- Drive
- Street Direction Prefix:
- N

Want to schedule an in-person or virtual tour? Have questions?
Want to schedule an in-person or virtual tour? Have questions?
Schedule a Tour or Ask a Question
Neighborhood Stats
Source: U.S. Census Bureau, ACS 5-Year Estimates
Air Quality
Source: AirNow.gov · Miami