Waterfront
Address
631 N Mashta Drive, Key Biscayne, FL
Price
$ 18,500,000
Property Attributes
- MLS#B26058354
- TypeSingle Family
- Listing Status Active
- CountyMiami-Dade
- CityKey Biscayne
- Area2520
- NeighborhoodMASHTA ISLAND
- Zip33149
- Style
- Year Built1958
- Taxes$ 112485
- Price$ 18,500,000
- Bedrooms4
- Full Bathrooms4
- Half Bathrooms1
- Sqr Footage2255
- Lot Size0.34 Acres
Data Source:
Beaches MLS (FL)
Property 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 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.
| Elementary School | Middle School | High School |
|---|---|---|
| Key Biscayne K-8 Elementary School | Ponce De Leon Middle School | Coral Gables High School |
| Price History | |
|---|---|
| 7/30/2026 | Listed $18,500,000 |
General Features
| Membership Required | false |
|---|---|
| Membership Description | No Membership Available |
| Sewer | Public Sewer |
| Heating | Central,Electric |
| Cooling | Central Air |
| Utilities | Electricity Connected,Sewer Connected,Water Connected |
| Possession | Close Of Escrow,Negotiable |
| Roof | Shingle |
| Appliances | Cooktop,Dryer,Dishwasher,ENERGY STAR Qualified Dishwasher,ENERGY STAR Qualified Dryer,ENERGY STAR Qualified Freezer,ENERGY STAR Qualified Refrigerator,ENERGY STAR Qualified Washer,Electric Cooktop,Electric Water Heater,Free-Standing Freezer,Microwave,Oven,Refrigerator,Water Heater,Wine Refrigerator,Washer |
| Patio/Porch Features | Covered,Patio,Rooftop |
| Pool Features | In Ground,Pool Equipment |
| Construction Materials | Brick,Concrete |
| Pets Allowed | No Pet Restrictions,Yes |
| Year Built | 1958 |
| View | Bay,Intercoastal,Pool,Water |
| Stories Count | 1 |
| Levels | One |
| Property Subtype | Single Family Residence |
| Tax Year | 2025 |
| Waterfront Features | Bayfront,Intracoastal Access,Navigable Water,No Fixed Bridges,Ocean Access,Seawall |
| Accessibility | None |
| County | Miami-Dade |
| New Construction | false |
| Property Type | Residential |
| Energy Efficient | HVAC,Appliances |
| Subdivision Name | MASHTA ISLAND |
| Facing Direction | East |
| Garage Y/N | false |
| Full Baths | 4 |
| Status | Active |
| High School | Coral Gables |
| City | Key Biscayne |
| Senior Community Y/N | false |
| MLS Area | 2520 |
| Carport Spaces | 2 |
| Carport Y/N | true |
| Elementary School | Key Biscayne K-8 |
| Tax Annual Amount | 112485 |
| Middle/Junior High School | Ponce De Leon |
| Property Condition | Resale,Updated/Remodeled |
| MLS Area Minor | DADE |
| Virtual Tour | https://www.propertypanorama.com/631-N-Mashta-Drive-Key-Biscayne-FL-33149/unbranded |
| Standard Status | Active |
| Occupancy Type | Vacant |
| Property Sub Type Additional | Single Family Residence |
| PostalCity | Key Biscayne |
| Legal Description | MASHTA ISLAND PB 60-93 LOT 7 BLK 1 LOT SIZE 100.000 X 150 OR 17980-3315 0198 4 |
Interior Features
| Interior Amenities | Dual Sinks,Entrance Foyer,Living/Dining Room,Walk-In Closet(s) |
|---|---|
| Flooring | Concrete,Laminate,Tile |
| Furnished Y/N | Unfurnished |
| Total Stories | 1 |
| Air Conditioning Y/N | true |
| Heating Y/N | true |
| Window Features | Storm Window(s) |
| Fireplace Y/N | false |
| Half Baths | 1 |
| Laundry Features | Inside,Laundry Room,Laundry Tub,Sink |
| Total Bedrooms | 4 |
| Main Level Bedrooms | 4 |
| Main Level Bathrooms | 4 |
| Total Baths | 5 |
Exterior Features
| Exterior Amenities | Garden,Outdoor Living Area |
|---|---|
| Parking Features | Attached Carport,Circular Driveway,Carport,Driveway |
| Lot Features | 1/4 to 1/2 Acre Lot,Sprinklers Automatic,Sprinkler System |
| Water Source | Public |
| Total Parking | 8 |
| Lot Size Area | 15000 |
| Building Area Total | 3720 |
| Lot Size Acres | 0.34 |
| Frontage Length | 100.00 |
| Frontage Type | Waterfront |
| Waterfront Y/N | true |
| Covered Spaces | 2 |
Amenities
- Foreclosure
- Views
- Short Sale
- New Construction
- Adult 55+
- Lease To Own
- No HOA Fees
- Furnished
- Primary On Main
- Air Conditioning
- Seller Finance
- Green
- Fixer Upper
- Horse
- Golf
- Fireplace
- Deck
- Garage
- Basement
- Pool
Property vs Single Family Average in 33149
Price
Taxes
Year Built
All information deemed reliable but not guaranteed. All properties are subject to prior sale, change or withdrawal. Neither listing broker(s) or information provider(s) shall be responsible for any typographical errors, misinformation, misprints and shall be held totally harmless. Listing(s) information is provided for consumer's personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. The data relating
