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.

📅 View days on the market

Days on the market

631 N Mashta Drive, Key Biscayne, FL 33149

Price
Price:
$18,500,000.00
Original List Price:
$18,500,000.00
List Price per Sq Ft (Calculated, Approx.):
$8,203.99
Property Status and Type
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
Rooms Distribution
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
Measures
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
Property Features
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
Construction
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
Taxes and Expenses
Tax Annual Amount:
$112,485.00
Tax Year:
2025
Property Tax Details:
City/County
Parking
Parking Total Spaces:
8
Carport Spaces:
2
Covered Spaces:
2
Parking Features:
Driveway, Circular Driveway, Attached Carport, Carport
Carport
Utilities
Sewer:
Public Sewer
Utilities Available:
Electricity Connected, Sewer Connected, Water Connected
Water Source:
Public
Community
Membership Details:
No Membership Available
Pets Allowed?:
Yes, No Restrictions
Subdivision Name:
MASHTA ISLAND
Senior Community:
No
Restrictions:
See Remarks
Community Dock
Terms
Listing Terms Considered by Seller:
Cash, Conventional
Buyer Possession:
Negotiable, Close Of Escrow
Zoning and Legal
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
Public Schools Assigned
Elementary School:
Key Biscayne K-8
High School:
Coral Gables
Middle Or Junior School:
Ponce De Leon
Listing History
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
Additional Information
Courtesy of:
Coldwell Banker
Attribution:
Not provided
Location
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
Property Map

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

Median Household Income $171,982
Median Home Value $1,231,500
Median Rent $3,501/mo
Median Age 43
Population 14,628

Air Quality

Source: AirNow.gov · Miami

🌬️ Air Quality Index (AQI) 45 Good
☀️ O3 35 Good
🫁 PM2.5 45 Good
Mortgage Calculator

Please note: Monthly HOA / Condo Fees Not Included. The calculator shows the listing price as home value. Update all fields at your convenience.

Calculate Your Mortgage Payment

$.00
$.00
6.5
30

Taxes and Insurance

$.00
$.00
%

Financial Analysis

%

%

$

$

$

$

$
Ver la Propiedad Ver la propiedad 631 N Mashta Drive, Key Biscayne, FL 33149
Association of REALTORS®
Disclaimer: IDX listing information is presented by Rebonus Brokerage LLC for consumer informational purposes only. All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This information is not verified for authenticity or accuracy and is not guaranteed by the MLS or the real estate broker. ©2026 BeachesMLS, Inc. The information provided is for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. This page presents structured listing information sourced directly from the MLS via the RESO Web API feed. Rebonus prioritizes maximum field coverage and data completeness, displaying the most granular MLS-provided attributes available.