631 N Mashta Dr, Key Biscayne, FL 33149
For Sale $18,500,000
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Listing Agent: Javier Gustavo Quiroz
Agent Phone:
305-909-5940
Agent Email:
javier.quiroz@cbrealty.com
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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.
Entrance Foyer
Walk-In Closet(s)
Taxes: $112,485.00
Tax Year: 2025
Garden
Private Rooftop Terrace
Patio - Covered
Patio - Open
Patio
Electric Water Heater
Cooktop
Dryer
Dishwasher
ENERGY STAR Qualified Dishwasher
ENERGY STAR Qualified Freezer
ENERGY STAR Qualified Refrigerator
ENERGY STAR Qualified Washer
ENERGY STAR Qualified Dryer
Free-Standing Freezer
Microwave
Oven
Refrigerator
Water Heater
Washer
Electric Cooktop
Wine Refrigerator
Pool
Water
Bay
Intracoastal
No Fixed Bridge
Ocean Access
Navigable Water
Seawall
Bayfront
Intracoastal
Elementary School: Key Biscayne K-8
Middle School: Ponce De Leon
Junior High: Ponce De Leon
High School: Coral Gables
MLS Area: 2520
Total Square Footage: 3,720
Price per Square Feet: $8,203.99
Total Rooms: 4
Total Floors: 1
Water: Public
Construction: Brick, Concrete
Date Listed: 2026-07-30 00:00:00
Pool: Y
Pool Description: In Ground, Equipment Included
Furnished: Unfurnished
Windows: Storm Window(S)
Parking: Attached Carport, Circular Driveway, Driveway, Carport
Flooring: Concrete, Laminate, Tile
Roof: Shingle
Heating: Central, Electric
Cooling: Central Air
Laundry: Inside, Laundry Room, Sink
Pets: Yes, No Restrictions
Restrictions: See Remarks
Sewer: Public Sewer
Parcel ID: 2452050080070
Listing Courtesy Of: Coldwell Banker
javier.quiroz@cbrealty.com
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.
Property Details
Price: $18,500,000
Sq Ft: 2,255
($8,204 per
sqft)
Bedrooms: 4
Bathrooms: 4
Partial Baths: 1
City: Key Biscayne
County: Miami-Dade
Type: Single Family
Development: Mashta Island
Acres: 0.3400
Virtual Tour/Floorplan: View
Year Built: 1958
Listing Number: B26058354
Status Code: A-Active
Taxes: $112,485.00
Tax Year: 2025
Garage:
Furnishings: Unfurnished
Pets Allowed: Yes, No Restrictions
Interior Features:
Entrance Foyer
Walk-In Closet(s)
Financial Information:
Taxes: $112,485.00
Tax Year: 2025
Exterior Features:
Garden
Private Rooftop Terrace
Patio - Covered
Patio - Open
Patio
Equipment:
Electric Water Heater
Cooktop
Dryer
Dishwasher
ENERGY STAR Qualified Dishwasher
ENERGY STAR Qualified Freezer
ENERGY STAR Qualified Refrigerator
ENERGY STAR Qualified Washer
ENERGY STAR Qualified Dryer
Free-Standing Freezer
Microwave
Oven
Refrigerator
Water Heater
Washer
Electric Cooktop
Wine Refrigerator
View:
Pool
Water
Bay
Intracoastal
Waterfront Description:
No Fixed Bridge
Ocean Access
Navigable Water
Seawall
Bayfront
Intracoastal
School Information:
Elementary School: Key Biscayne K-8
Middle School: Ponce De Leon
Junior High: Ponce De Leon
High School: Coral Gables
Additional Information:
MLS Area: 2520
Total Square Footage: 3,720
Price per Square Feet: $8,203.99
Total Rooms: 4
Total Floors: 1
Water: Public
Construction: Brick, Concrete
Date Listed: 2026-07-30 00:00:00
Pool: Y
Pool Description: In Ground, Equipment Included
Furnished: Unfurnished
Windows: Storm Window(S)
Parking: Attached Carport, Circular Driveway, Driveway, Carport
Flooring: Concrete, Laminate, Tile
Roof: Shingle
Heating: Central, Electric
Cooling: Central Air
Laundry: Inside, Laundry Room, Sink
Pets: Yes, No Restrictions
Restrictions: See Remarks
Sewer: Public Sewer
Parcel ID: 2452050080070
The Real Estate information provided by Frenchman’s Reserve and Club Properties, Inc. on our website and or our mobile application is for general information purposes only. All information is provided in good faith however we make no representation or warranty of any kind, express or implied regarding the accuracy, adequacy, validity, reliability, availability, or completeness of any information on the Site. The MLS data is coming from the local board of REALTORS, BROWARD, PALM BEACHES & ST. LUCIE REALTORS.
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Map of 631 N Mashta Dr, Key Biscayne, FL 33149
Listing Courtesy Of: Coldwell Banker
javier.quiroz@cbrealty.com