631 N Mashta Drive, Key Biscayne, FL 33149
New ListingOverview
Description
Supplements: ... (Read more) 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.
Listing Details MLS# B26058354
General Property Information
- Property Sub Type
- Single Family Residence
- Bedrooms Total
- 4
- Bathrooms Total
- 5
- Bathrooms Full
- 4
- Bathrooms Half
- Yes
- Building Area Main
- 3720
- Building Area Source
- Public Records
- Living Area Main
- 2255
- Living Area Source
- Public Records
- Adjusted Area Main
- 2779
- Accessibility Features YN
- No
- Year Built
- 1958
- Carport YN
- Yes
- Attached Carport YN
- Yes
- Carport Spaces
- 2
- Covered Spaces
- 2
- Parking Total
- 8
- Gated Community YN
- No
- Lot Size Area
- 15000
- Lot Size Acres
- 0.34
- Frontage Length
- 100
- Senior Community YN
- No
- Waterfront YN
- Yes
- Water Frontage Feet
- 100
- Outdoor Living Spaces YN
- Yes
- Stories Total
- Yes
- Stories
- Yes
- Direction Faces
- East
- Fireplace YN
- No
- Pool Private YN
- Yes
- Green Verification YN
- Yes
- Furnished
- Unfurnished
Property Features
Contract Information
- Comp Sale YN
- No
- Original List Price
- 18500000
- Occupant Type
- Vacant
- Listing Service
- Full Service
Location and Legal
- Country
- United States
- County Or Parish
- Miami-Dade
- Street Number
- 631
- Street Direction Prefix
- N
- Street Name
- Mashta
- Street Suffix
- Drive
- Municipality Type
- Incorporated
- Municipal Code
- 24
- State Or Province
- FL
- Postal Code
- 33149
- Postal Code +4
- 1720
- Subdivision Name
- MASHTA ISLAND
- Area
- 2520
- Geographic Area
- DADE
- Elementary School
- Key Biscayne K-8
- Middle Or Junior School
- Ponce De Leon
- High School
- Coral Gables
- Special Assessment YN
- No
- Parcel Number
- 2452050080070
- Zoning
- 2001
- Flood Zone
- AE
Financial Information
- Application Required YN
- No
- Master Association YN
- No
- Membership Fee Required YN
- No
- Tax Annual Amount
- 112485
- Tax Year
- 2025
- Tax Legal Description
- MASHTA ISLAND PB 60-93 LOT 7 BLK 1 LOT SIZE 100.000 X 150 OR 17980-3315 0198 4
- Estimated Monthly Assoc Recurring Fee
- 0
Status Change Information
- Major Change Timestamp
- 2026-07-30T18:40:51Z
- Major Change Type
- New Listing
- Status Change Date
- 2026-07-30
More Information
Leasing Permitted Details
- Leasing Permitted YN
- No
Parking Information
- Open Parking Spaces
- 6
Boat and Dock Information
- Dock
- Yes
Main Level Rooms
- Main Level Bathrooms
- 4
- Main Level Bedrooms
- 4
Pet Details
- Pet Fee YN
- No
Storm Protection
- Impact Glass
- Complete
Room Types
- Dining Room Level
- Main
- Kitchen Level
- Main
- Living Room Level
- Main
- Master Bedroom Level
- Main
- Dining Room
- Yes
- Kitchen
- Yes
- Living Room
- Yes
- Master Bedroom
- Yes
Price Calculations
- Current Price To SqFt
- 8203.99
Originating Details
- Originating System Key
- 20260729170810306019000000
- Originating System ID
- M00000170
Office/Member Information
- DXORIGMLSID
- RML
Dining Area
- Dining/Living Room
- Yes
Exterior Features
- Garden
- Yes
- Private Rooftop Terrace
- Yes
Flooring
- Concrete
- Yes
- Laminate
- Yes
- Tile
- Yes
Parking Features
- Circular Driveway
- Yes
- Driveway
- Yes
- Attached Carport
- Yes
- Carport
- Yes
Property Condition
- Resale
- Yes
- Updated/Remodeled
- Yes
Special Listing Conditions
- Standard
- Yes
Structure Type
- House
- Yes
Possession
- Close Of Escrow
- Yes
- Negotiable
- Yes
Sewer
- Public Sewer
- Yes
Utilities
- Electricity Connected
- Yes
- Sewer Connected
- Yes
- Water Connected
- Yes
View
- Pool
- Yes
- Water
- Yes
Heating
- Central
- Yes
- Electric
- Yes
Sprinkler Description
- Auto Sprinkler
- Yes
- Zoned Sprinkler
- Yes
Water Access
- No Fixed Bridge
- Yes
- Ocean Access
- Yes
Water View
- Bay
- Yes
- Intracoastal
- Yes
Window Features
- Storm Window(s)
- Yes
Appliances
- Dishwasher
- Yes
- Dryer
- Yes
- Electric Cooktop
- Yes
- ENERGY STAR Qualified Dishwasher
- Yes
- ENERGY STAR Qualified Dryer
- Yes
- ENERGY STAR Qualified Freezer
- Yes
- ENERGY STAR Qualified Refrigerator
- Yes
- ENERGY STAR Qualified Washer
- Yes
- Free-Standing Freezer
- Yes
- Microwave
- Yes
- Oven
- Yes
- Refrigerator
- Yes
- Washer
- Yes
- Water Heater
- Yes
- Wine Refrigerator
- Yes
- Cooktop
- Yes
Construction Materials
- Brick
- Yes
- Concrete
- Yes
Green Energy Efficient
- Appliances
- Yes
- HVAC
- Yes
Interior Features
- Entrance Foyer
- Yes
- Walk-In Closet(s)
- Yes
Laundry Features
- Inside
- Yes
- Laundry Room
- Yes
- Sink
- Yes
Listing Terms
- Cash
- Yes
- Conventional
- Yes
Pool Features
- Equipment Included
- Yes
- In Ground
- Yes
Roof
- Shingle
- Yes
Water Source
- Public
- Yes
Waterfront Features
- Bayfront
- Yes
- Intracoastal
- Yes
- Navigable Water
- Yes
- Seawall
- Yes
Water Heater Details
- Electric Water Heater
- Yes
Boat and Dock Features
- Electric Available
- Yes
- Private Dock
- Yes
Cooling
- Central Air
- Yes
Showing Requirements
- 24 Hour Notice
- Yes
- Call Listing Agent
- Yes
Master Bedroom/Bath
- Dual Sinks
- Yes
Membership
- No Membership Available
- Yes
Pets Allowed YN
- Yes
- Yes
Pets Allowed
- No Restrictions
- Yes
Restrictions
- See Remarks
- Yes
Tax Information
- City/County
- Yes
Outdoor Living Spaces
- Patio
- Yes
Patio Details
- Patio - Covered
- Yes
- Patio - Open
- Yes
Acreage Description
- 1/4 To Less Than 1/2 Acre Lot
- Yes
- Less Than 1 Acre Lot
- Yes
Room Information
| Room Name | Length | Width | Level |
|---|---|---|---|
| Living Room | 16.00 | 22.00 | Main |
| Kitchen | 12.00 | 11.00 | Main |
| Master Bedroom | 25.00 | 20.00 | Main |
| Dining Room | 12.00 | 14.00 | Main |