$18,500,000
Key Biscayne, FL 33149
MLS# B26058354
4 beds | 5 baths | 3720 sqft

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Property 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
Details
Maps
Contract Information
Comp Sale YN: No
Occupant Type: Vacant
Listing Date: 2026-07-29
Status: Active
Original List Price: 18500000
List Price: $18,500,000
Current Price: $18,500,000
Listing Service: Full Service
Location and Legal
County Or Parish: Miami-Dade
Municipality Type: Incorporated
Municipal Code: 24
Geographic Area: DADE
Special Assessment YN: No
Flood Zone: AE
Country: United States
Street Number: 631
Street Direction Prefix: N
Street Name: Mashta
Street Suffix: Drive
State Or Province: FL
Postal Code: 33149
Postal Code +4: 1720
Subdivision Name: MASHTA ISLAND
Area: 2520
Elementary School: Key Biscayne K-8
Middle Or Junior School: Ponce De Leon
High School: Coral Gables
Parcel Number: 2452050080070
Zoning: 2001
General Property Information
Adjusted Area Main: 2779
Living Area Main: 2255
Living Area Source: Public Records
Accessibility Features YN: No
Attached Carport YN: Yes
Gated Community YN: No
Lot Size Area: 15000
Water Frontage Feet: 100
Senior Community YN: No
Outdoor Living Spaces YN: Yes
Furnished: Unfurnished
Stories Total: 1
Stories: 1
Fireplace YN: No
Pool Private YN: Yes
Green Verification YN: Yes
Property Sub Type: Single Family Residence
Bedrooms Total: 4
Bathrooms Total: 5
Bathrooms Full: 4
Bathrooms Half: 1
Building Area Main: 3720
Building Area Source: Public Records
Year Built: 1958
Carport YN: 1
Carport Spaces: 2
Covered Spaces: 2
Parking Total: 8
Lot Size Acres: 0.34
Frontage Length: 100
Waterfront YN: 1
Direction Faces: East
Financial Information
Application Required YN: No
Master Association YN: No
Estimated Monthly Assoc Recurring Fee: 0
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
Office/Member Information
DXORIGMLSID: RML
Dining Area
Dining/Living Room: 1
Exterior Features
Garden: 1
Private Rooftop Terrace: 1
Flooring
Concrete: 1
Laminate: 1
Tile: 1
Leasing Permitted Details
Leasing Permitted YN: No
Parking Features
Circular Driveway: 1
Driveway: 1
Attached Carport: 1
Carport: 1
Parking Information
Open Parking Spaces: 6
Property Condition
Resale: 1
Updated/Remodeled: 1
Special Listing Conditions
Standard: 1
Structure Type
House: 1
Possession
Close Of Escrow: 1
Negotiable: 1
Sewer
Public Sewer: 1
Utilities
Electricity Connected: 1
Sewer Connected: 1
Water Connected: 1
View
Pool: 1
Water: 1
Heating
Central: 1
Electric: 1
Sprinkler Description
Auto Sprinkler: 1
Zoned Sprinkler: 1
Water Access
No Fixed Bridge: 1
Ocean Access: 1
Water View
Bay: 1
Intracoastal: 1
Window Features
Storm Window(s): 1
Appliances
Dishwasher: 1
Dryer: 1
Electric Cooktop: 1
ENERGY STAR Qualified Dishwasher: 1
ENERGY STAR Qualified Dryer: 1
ENERGY STAR Qualified Freezer: 1
ENERGY STAR Qualified Refrigerator: 1
ENERGY STAR Qualified Washer: 1
Free-Standing Freezer: 1
Microwave: 1
Oven: 1
Refrigerator: 1
Washer: 1
Water Heater: 1
Wine Refrigerator: 1
Cooktop: 1
Construction Materials
Brick: 1
Concrete: 1
Green Energy Efficient
Appliances: 1
HVAC: 1
Interior Features
Entrance Foyer: 1
Walk-In Closet(s): 1
Laundry Features
Inside: 1
Laundry Room: 1
Sink: 1
Listing Terms
Cash: 1
Conventional: 1
Pool Features
Equipment Included: 1
In Ground: 1
Roof
Shingle: 1
Water Source
Public: 1
Waterfront Features
Bayfront: 1
Intracoastal: 1
Navigable Water: 1
Seawall: 1
Water Heater Details
Electric Water Heater: 1
Boat and Dock Information
Dock: Yes
Boat and Dock Features
Electric Available: 1
Private Dock: 1
Cooling
Central Air: 1
Showing Requirements
24 Hour Notice: 1
Call Listing Agent: 1
Main Level Rooms
Main Level Bathrooms: 4
Main Level Bedrooms: 4
Master Bedroom/Bath
Dual Sinks: 1
Membership
No Membership Available: 1
Pets Allowed YN
Yes: 1
Pets Allowed
No Restrictions: 1
Pet Details
Pet Fee YN: No
Restrictions
See Remarks: 1
Storm Protection
Impact Glass: Complete
Tax Information
City/County: 1
Outdoor Living Spaces
Patio: 1
Patio Details
Patio - Covered: 1
Patio - Open: 1
Room Types
Dining Room: 1
Dining Room Level: Main
Kitchen: 1
Kitchen Level: Main
Living Room: 1
Living Room Level: Main
Master Bedroom: 1
Master Bedroom Level: Main
Price Calculations
Current Price To SqFt: 8203.99
Acreage Description
1/4 To Less Than 1/2 Acre Lot: 1
Less Than 1 Acre Lot: 1
Status Change Information
Major Change Timestamp: 2026-07-30T18:40:51Z
Major Change Type: New Listing
Status Change Date: 2026-07-30
Originating Details
Originating System Key: 20260729170810306019000000
Originating System ID: M00000170
Property Features
Dining Area: Dining/Living Room
Exterior Features: Garden; Private Rooftop Terrace
Flooring: Concrete; Laminate; Tile
Parking Features: Circular Driveway; Driveway; Attached Carport; Carport
Property Condition: Resale; Updated/Remodeled
Special Listing Conditions: Standard
Appliances: Dishwasher; Dryer; Electric Cooktop; ENERGY STAR Qualified Dishwasher; ENERGY STAR Qualified Dryer; ENERGY STAR Qualified Freezer; ENERGY STAR Qualified Refrigerator; ENERGY STAR Qualified Washer; Free-Standing Freezer; Microwave; Oven; Refrigerator; Washer; Water Heater; Wine Refrigerator; Cooktop
Water Heater Details: Electric Water Heater
Boat and Dock Features: Electric Available; Private Dock
Construction Materials: Brick; Concrete
Cooling: Central Air
Green Energy Efficient: Appliances; HVAC
Heating: Central; Electric
Interior Features: Entrance Foyer; Walk-In Closet(s)
Laundry Features: Inside; Laundry Room; Sink
Listing Terms: Cash; Conventional
Membership: No Membership Available
Pets Allowed YN: Yes
Pets Allowed: No Restrictions
Pool Features: Equipment Included; In Ground
Possession: Close Of Escrow; Negotiable
Restrictions: See Remarks
Roof: Shingle
Sewer: Public Sewer
Sprinkler Description: Auto Sprinkler; Zoned Sprinkler
Structure Type: House
Tax Information: City/County
Utilities: Electricity Connected; Sewer Connected; Water Connected
View: Pool; Water
Water Access: No Fixed Bridge; Ocean Access
Water Source: Public
Water View: Bay; Intracoastal
Waterfront Features: Bayfront; Intracoastal; Navigable Water; Seawall
Window Features: Storm Window(s)
Showing Requirements: 24 Hour Notice; Call Listing Agent
Outdoor Living Spaces: Patio
Patio Details: Patio - Covered; Patio - Open
Room Types: Dining Room; Kitchen; Living Room; Master Bedroom
Acreage Description: 1/4 To Less Than 1/2 Acre Lot; Less Than 1 Acre Lot
Supplements
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.
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 |
Listing Office: Coldwell Banker
Last Updated: September - 09 - 2026
This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. Copyright 2026 Beaches Multiple Listing Service, Inc. All rights reserved. Information Not Guaranteed and Must Be Confirmed by End User. Site contains live data.

