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640 S Mashta Drive, Key Biscayne, FL 33149

$16,800,000

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https://www.propertypanorama.com/instaview/mia/A11990382

Property Type: Residential Bedrooms: 4 Baths: 4 Square Footage: 4,990 Status: Active

Current Price: $16,800,000 List Date: 4/02/2026 Last Modified: 5/31/2026

Description

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

More Information MLS# A11990382

Contract Information

Comp Sale YN: No Occupant Type: Call Listing Agent Listing Date: 2026-04-02 Status: Active Original List Price: 16800000 List Price: $16,800,000 Current Price: $16,800,000

Location and Legal

County Or Parish: Miami-Dade County Parish Name: Miami-Dade City Name: Key Biscayne Municipal Code: 24 Postal Zip: 33149 Subdivision Number: 8 Flood Zone: AE Country: United States Street Number: 640 Street Direction Prefix: S Street Name: Mashta Street Suffix: Drive State Or Province: FL Postal Code: 33149 Postal Code +4: 1735 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: 2452050080320 Zoning: 2001

General Property Information

Adjusted Area Main: 4234 Living Area Main: 3620 Lot Size Dimensions: 15000 Lot Size Area: 15000 Water Frontage Feet: 100 Senior Community YN: No Pool Private YN: Yes Property Sub Type: Single Family Residence Bedrooms Total: 4 Bathrooms Total: 4 Bathrooms Full: 4 Building Area Main: 4990 Year Built: 1968 Garage YN: 1 Attached Garage YN: 1 Garage Spaces: 2 Covered Spaces: 2 Lot Size Acres: 0.34 Waterfront YN: 1 Direction Faces: East

Financial Information

Membership Fee Required YN: No Tax Annual Amount: 155651 Tax Year: 2025 Tax Legal Description: MASHTA ISLAND PB 60-93 LOT 9 BLK 3 LOT SIZE 100.000 X 150 OR 18642-3922 0599 1

Office/Member Information

DXORIGMLSID: SEF

Dining Area

Breakfast Area: 1 Dining/Living Room: 1 L Shaped Dining: 1

Entry Information

Entry Level: 1

Exterior Features

Other: 1

Flooring

Other: 1

Leasing Permitted Details

Leasing Permitted YN: Yes Okay To Lease: 1

Parking Features

Driveway: 1 Garage Door Opener: 1 Guest: 1 Attached: 1 Attached Garage: 1 Garage: 1

Property Condition

Resale: 1

Possession

Close Of Escrow: 1

Sewer

Public Sewer: 1

Special Information

Sold As-Is: 1

Utilities

Cable Available: 1

View

Garden: 1

Heating

Other: 1

Water View

Bay: 1

Appliances

Dishwasher: 1

Construction Materials

Block: 1

Interior Features

Bedroom Layout - Split: 1 Entrance Foyer: 1 Pantry: 1 Vaulted Ceiling(s): 1 Walk-In Closet(s): 1

Listing Terms

Cash: 1 Conventional: 1

Pool Features

In Ground: 1

Road Frontage Type

Public Road: 1

Roof

Barrel: 1

Water Source

Public: 1

Waterfront Features

Ocean Front: 1

Architectural Style

Other: 1

Boat and Dock Information

Dock: Available

Cooling

Central Air: 1

Showing Requirements

Call Listing Agent: 1

Master Bedroom/Bath

2 Master Baths: 1 Dual Sinks: 1 Master Bdrm - Ground: 1 Separate Shower: 1 Separate Tub: 1

Pets Allowed YN

Yes: 1

Pets Allowed

Dogs OK: 1

Pool Size Details

Pool Size (WxL): 0

Tax Information

Tax Reflects No Exemptions: 1

Room Types

Garage Converted: 1

Section Details

Parcel Number MLX: 0320

Status Change Information

Major Change Timestamp: 2026-04-02T04:00:00Z Major Change Type: New Listing Status Change Date: 2026-04-02

Originating Details

Originating System Key: 446223578 Originating System ID: M00000151

Property Features

Dining Area: Breakfast Area; Dining/Living Room; L Shaped Dining Exterior Features: Other Flooring: Other Leasing Permitted Details: Okay To Lease Parking Features: Driveway; Garage Door Opener; Guest; Attached; Attached Garage; Garage Property Condition: Resale Appliances: Dishwasher Architectural Style: Other Construction Materials: Block Cooling: Central Air Heating: Other Interior Features: Bedroom Layout - Split; Entrance Foyer; Pantry; Vaulted Ceiling(s); Walk-In Closet(s) Listing Terms: Cash; Conventional Pets Allowed YN: Yes Pets Allowed: Dogs OK Pool Features: In Ground Possession: Close Of Escrow Road Frontage Type: Public Road Roof: Barrel Sewer: Public Sewer Special Information: Sold As-Is Tax Information: Tax Reflects No Exemptions Utilities: Cable Available View: Garden Water Source: Public Water View: Bay Waterfront Features: Ocean Front Showing Requirements: Call Listing Agent Room Types: Garage Converted

Room Information

Garage Converted

Listing Office: DLS International Realty

Last Updated: May - 31 - 2026

640 S Mashta Drive, Key Biscayne, FL 33149- MLS# A11990382

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