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$18,500,000
Monthly Est:$92,081
4 Beds
- 5 Baths
4 full baths + 1 half bath
2,255sqft
631 N Mashta Dr, Key Biscayne, FL 33149
$18,500,000
$92,081/moEst:
Get Pre-Approved
Single Family Residence
Built in 1958
$-- HOA
14,810.4 sqft lot
$8,204/sq.ft
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.
- Houzeo last checked: 13 minutes ago
- Listing updated: October 26, 2026 at 8:12 pm
- Listing Provided by: Javier Gustavo Quiroz DRE #3609636 | Coldwell Banker (561) 395-2233
- Source: Beaches MLS-FL | MLS#: B26058354

Property Details
Status
Active
Type
Single Family Residence
No. of Stories
1
County
City
Neighborhood
--
Year Built
1958
HOA Fees
-
Finished Area
2,255 sqft
Lot Size
14,810.4 sqft lot
Basement Area
- sqft
MLS Name
Beaches MLS
MLS Number
B26058354
MLS Status
Active
Days on Market
93
Cumulative Days on Market
89

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Location
Facts & Features
Rooms
Bedrooms & bathrooms
Bedrooms: 4
Bathrooms: 5
Kitchen
Level: Main
Area: 132.00 Square Feet
Dimensions: 12 X 11
DiningRoom
Level: Main
Area: 168.00 Square Feet
Dimensions: 12 X 14
LivingRoom
Level: Main
Area: 352.00 Square Feet
Dimensions: 16 X 22
PrimaryBedroom
Level: Main
Area: 500.00 Square Feet
Dimensions: 25 X 20
Interior
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
Window Features
Storm Windows
Flooring
Concrete, Laminate, Tile
Sewer
Public Sewer
Cooling
Central Air
Exterior Features
Garden, Outdoor Living Area
Interior Features
Dual Sinks, Entrance Foyer, Living Dining Room, Walk In Closets
Heating
Central, Electric
Construction
Year Built
Year Built: 1958
Home type
Single Family Residence
Roof
Shingle
Property Condition
Resale, Updated Remodeled
Construction Materials
Brick, Concrete
Utilities & Energy
Utilities
Electricity Connected, Sewer Connected, Water Connected
Water Source
Public
Laundry Features
Inside, Laundry Room, Laundry Tub, Sink
Parking Features
Attached Carport, Circular Driveway, Carport, Driveway
Pool Features
In Ground, Pool Equipment
Other Features
Patio And Porch Features
Covered, Patio, Rooftop
Subdivision Name
Mashta Island
Lot Features
Quarter To Half Acre Lot, Sprinklers Automatic, Sprinkler System
Price History
| Date | Event | Price |
|---|---|---|
07/30/2026 Source: | Off Market | $18,500,000 -21.28% $8,204/sqft |
02/07/2025 Source: | Listed for Sale | $23,500,000 $10,421/sqft |
02/07/2025 Source: | Off Market | $23,500,000 $10,421/sqft |
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IDX information is provided exclusively for consumers’ personal, non-commercial use, that it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing, and that the data is deemed reliable but is not guaranteed accurate by BeachesMLS. All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This data is not verified for authenticity or accuracy and may not reflect all real estate activity in the market. Based on information © 2026 BeachesMLS, Inc. All Rights Reserved.
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