640 S Mashta Drive, Key Biscayne, FL 33149

$16,800,000

Virtual Tour

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

Overview

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

Listing Details MLS# A11990382

General Property Information

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

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

Contract Information

Comp Sale YN: No
Original List Price: 16800000
Occupant Type: Call Listing Agent

Location and Legal

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

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

Status Change Information

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

More Information

Entry Information

Entry Level: Yes

Leasing Permitted Details

Leasing Permitted YN: Yes
Okay To Lease: Yes

Boat and Dock Information

Dock: Available

Section Details

Parcel Number MLX: 0320

Originating Details

Originating System Key: 446223578
Originating System ID: M00000151

Office/Member Information

DXORIGMLSID: SEF

Dining Area

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

Exterior Features

Other: Yes

Flooring

Other: Yes

Parking Features

Driveway: Yes
Garage Door Opener: Yes
Guest: Yes
Attached: Yes
Attached Garage: Yes
Garage: Yes

Property Condition

Resale: Yes

Possession

Close Of Escrow: Yes

Sewer

Public Sewer: Yes

Special Information

Sold As-Is: Yes

Utilities

Cable Available: Yes

View

Garden: Yes

Heating

Other: Yes

Water View

Bay: Yes

Appliances

Dishwasher: Yes

Construction Materials

Block: Yes

Interior Features

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

Listing Terms

Cash: Yes
Conventional: Yes

Pool Features

In Ground: Yes

Road Frontage Type

Public Road: Yes

Roof

Barrel: Yes

Water Source

Public: Yes

Waterfront Features

Ocean Front: Yes

Architectural Style

Other: Yes

Cooling

Central Air: Yes

Showing Requirements

Call Listing Agent: Yes

Master Bedroom/Bath

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

Pets Allowed YN

Yes: Yes

Pets Allowed

Dogs OK: Yes

Pool Size Details

Pool Size (WxL): No

Tax Information

Tax Reflects No Exemptions: Yes

Room Types

Garage Converted: Yes

Room Information

Room Name
Garage Converted

Listing Office: DLS International Realty

Last Updated: May - 31 - 2026

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