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631 N Mashta Drive

Key Biscayne, FL 33149

$18,500,000 $77,996/Mo

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Overview

Bed

Bath

2,255

Sqft

15,000

Sqft(Lot)

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.

Property Details

Property Type : Residential

Price : $18,500,000

AD Id : 88623948

MLS Id : B26058354

Beds : 4

Lot Size : 15,000 Sqft

Living Area Size : 2,255

Year Built : 1958

County : Miami-Dade

Subdivision: Mashta Island

Map

What's Nearby

Nearby Areas

Features

Bedroom Information

Total beds: 4

Bathroom Information

Total Baths: 5 Full Baths: 4 Half Baths: 1

Room Information

Rooms Total: 4

Roofing Information

Shingle

Flooring Information

Concrete, Laminate, Tile
Interior Features

DualSinks, EntranceFoyer, LivingDiningRoom, WalkInClosets

Roof: Shingle

Appliances: Cooktop, Dryer, Dishwasher, EnergyStarQualifiedDishwasher, EnergyStarQualifiedDryer, EnergyStarQualifiedFreezer, EnergyStarQualifiedRefrigerator, EnergyStarQualifiedWasher, ElectricCooktop, ElectricWaterHeater, FreeStandingFreezer, Microwave, Oven, Refrigerator, WaterHeater, WineRefrigerator, Washer

Laundry Features: Inside, LaundryRoom, LaundryTub, Sink

Window Features: StormWindows
Heating & Cooling

Has Heating: Yes Heating: Central, Electric Has Cooling: Yes Cooling: CentralAir Water front: 1

Building Information

Year Built: 1958

Building Area Total: 3720

Construction Materials: Brick, Concrete

Stories: 1

Frontage Length: 100.00

Patio And Porch Features: Covered, Patio, Rooftop

Pool Features: InGround, PoolEquipment

Private Pool: Yes

Water front Features: Bayfront,IntracoastalAccess,NavigableWater,NoFixedBridges,OceanAccess,Seawall

View: Bay, Intercoastal, Pool, Water
Exterior Features

Exterior Features: Garden, OutdoorLivingArea

Lot Information

Main Square Feet: 15000 Lot Size Acres: 0.34 Lot Description: QuarterToHalfAcreLot,SprinklersAutomatic,SprinklerSystem

Property Information

Subdivision: MASHTA ISLAND Source Property Type: Residential Postal Code Plus 4: 1720 Property SubType: Single Family Residence Direction Faces: East Levels: One Property Age: 68

Listing Price Information

Listing Price: $18500000

Cash, Conventional

Tax Information

Parcel Number: 2452050080070 Tax Year: 2025 Annual Tax: $112485 Tax Legal Desc: MASHTA ISLAND PB 60-93 LOT 7 BLK 1 LOT SIZE 100.000 X 150 OR 17980-3315 0198 4

Virtual Tour

Virtual Tour (External Link)

Parking Information

Parking Total: 8 AttachedCarport, CircularDriveway, Carport, Driveway

Garage Information

Pets Allowed: NoPetRestrictions, Yes

School Information

Elementary School: Key Biscayne K-8 Junior High School: Ponce De Leon Senior High School: Coral Gables
Utility Information

ElectricityConnected, SewerConnected, WaterConnected
Location Information

WaterSource: Public

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Nearby Home Value

Address	Estimate	Bed	Bath	Sq. Ft	Lot Size
640 S Mashta Dr, Key Biscayne, FL, 33149	$16,800,000	4	4	3,620	3,620 SqFt
200 Harbor Dr, Key Biscayne, FL, 33149	$25,900,000	4	4	2,566	2,566 SqFt
200 Ocean Lane Drive #409, Key Biscayne, FL, 33149	$1,499,000	2	2	1,610	1,610 SqFt
200 Ocean Lane Drive #407, Key Biscayne, FL, 33149	$1,275,000	2	2	1,580	1,580 SqFt
200 Ocean Lane Drive #401, Key Biscayne, FL, 33149	$3,600,000	3	3	2,412	2,412 SqFt
200 Ocean Lane Drive #501, Key Biscayne, FL, 33149	$3,850,000	4	4	1,880	1,880 SqFt
111 Reef Lane, Key Biscayne, FL, 33149	$11,500,000	7	6	5,008	5,008 SqFt
31 Island Drive, Key Biscayne, FL, 33149	$9,800,000	6	7	5,826	5,826 SqFt
120 Knollwood Drive, Key Biscayne, FL, 33149	$19,950,000	6	7	6,208	6,208 SqFt
24 Grand Bay Estates Ci.., Key Biscayne, FL, 33149	$4,950,000	5	6	4,220	4,220 SqFt

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631 N Mashta Drive

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Exterior Features

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