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640 S Mashta Drive, Key Biscayne, FL 33149 - Photo 1
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640 S Mashta Drive, Key Biscayne, FL 33149 - Photo 4
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$16,800,000

640 S Mashta Drive, Key Biscayne, FL 33149

Mashta Island

Beds

4 Beds

Baths

4 Baths

Living Area

3,620 Sq Ft

Lot

0.34 acres

Built

1968

Days Listed

81

Ocean FrontPool

Price Per Sq Ft

$4,641/sqft

Listed

Apr 2, 2026

Garage

2 spaces

Property Type

Single Family Residence

Property Overview

This 4-bedroom waterfront single family residence at 640 S Mashta Drive, Key Biscayne, FL 33149 in the Mashta Island community on 0.34 acres with 3,620 square feet of living area, built in 1968 is listed for $16,800,000. Notable MLS signals include Ocean Front, Pool.

MLS Public Remarks

Welcome to your own slice of paradise! Enjoy breathtaking sunsets from your private dock on this waterfront property boasting 100 feet of direct Biscayne Bay frontage. Ideally located on Mashta Island. Set on a 15,000 SF lot, the home features 5 beds, 5 baths, including 2 bayfront primary suites with stunning views, impact windows and doors throughout. The open-concept layout flows seamlessly from the living and dining areas to the modern kitchen and out to the pool and entertainment patio, with floor-to-ceiling glass doors that open to blend indoor and outdoor living. Tranquil guest suite upstairs offering privacy and views. It also features an oversized 2-car garage, covered parking, and a spacious driveway for guests. Perfect to move in, renovate, or build your dream waterfront estate

Key Biscayne Property Snapshot

Property Type

Residential

Sub Type

Single Family Residence

Total Baths

4

Building Area

4,990 sq ft

Lot Size

15,000 sq ft

Condition

Resale

MLS #

A11990382

Waterfront, Boating & Outdoor

Waterfront

Yes

Waterfront

Ocean Front

Private Pool

Yes

Pool Features

In Ground

View

Garden, Bay

Interior & Construction

Interior Features

Entrance Foyer, Pantry, Vaulted Ceiling(s), Walk-In Closet(s), Bedroom Layout - Split

Primary Bedroom

2 Master Baths, Dual Sinks, Master Bdrm - Ground, Separate Shower, Separate Tub

Rooms

Garage Converted

Appliances

Dishwasher

Flooring

Other

Construction

Block

Heating

Other

Cooling

Central Air

Parking, HOA & Rules

Garage Spaces

2

Parking Features

Driveway, Garage Door Opener, Guest, Garage, Attached Garage, Attached

Pets Allowed

Yes, Dogs OK

Taxes, Utilities & MLS

Annual Taxes

$155,651

Tax Year

2025

Parcel Number

2452050080320

Zoning

2001

County

Miami-Dade

MLS Area

2520

Sewer

Public Sewer

Water Source

Public

Utilities

Cable Available

Photos

38

Listing courtesy of DLS International Realty

Listing Agent: Brigitte De Langeron

BeachesMLS

All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This information is not verified for authenticity or accuracy and is not guaranteed. Copyright © 2026 BeachesMLS, Inc.

The data relating to real estate for sale on this website comes in part from the Internet Data Exchange (IDX) program of the BeachesMLS. Real estate listings held by brokerage firms other than Levin Investments, Inc are marked with the IDX logo and detailed information about them includes the name of the listing broker. Data provided is deemed reliable but is not guaranteed. All information is subject to change and should be independently verified.

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631 N Mashta Drive, Key Biscayne, FL 33149
49 photos

$18,500,000

631 N Mashta Drive, Key Biscayne, FL 33149

Mashta Island

4 Beds/4.5 Baths/2,255 Sq Ft/0.34 acres
Dock / Boat AccessOcean AccessPool
$8,204/sqft27 DOMBuilt 1958

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.

669 S Mashta Drive, Key Biscayne, FL 33149
28 photos

$5,799,000

669 S Mashta Drive, Key Biscayne, FL 33149

Mashta Island

4 Beds/3.5 Baths/3,382 Sq Ft/0.23 acres
Pool
$1,715/sqft18 DOMBuilt 1960

Located on the exclusive and highly sought-after Mashta Island, this exceptional property offers a rare opportunity to build your dream home or enjoy the existing beautifully refurbished residence. The home features new bathrooms, updated flooring, and tasteful modern finishes throughout. Designed for relaxed Florida living, the spacious covered terrace overlooks a stunning mosaic-tiled pool, creating the perfect setting for entertaining or enjoying the tropical surroundings. A unique opportunity in one of Key Biscayne's most desirable neighborhoods. Easy to show.