Welcome to

Destiny International Properties

Browse Properties

Advanced Search

631 N Mashta Drive, Key Biscayne, FL 33149

New Listing
$18,500,000
Property Type: Residential Bedrooms: 4 Baths: 5 Square Footage: 3,720 Status: Active
Current Price: $18,500,000 List Date: 7/30/2026 Last Modified: 7/31/2026

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

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.

More Information MLS# B26058354

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

Room Information

Living Room Length: 16.00 Length: 16.00 Width: 22.00 Width: 22.00 Level: Main Kitchen Length: 12.00 Length: 12.00 Width: 11.00 Width: 11.00 Level: Main Master Bedroom Length: 25.00 Length: 25.00 Width: 20.00 Width: 20.00 Level: Main Dining Room Length: 12.00 Length: 12.00 Width: 14.00 Width: 14.00 Level: Main
Listing Office: Coldwell Banker
Last Updated: July - 31 - 2026
631 N Mashta Drive, Key Biscayne, FL 33149- MLS# B26058354
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.