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640 S Mashta Dr, Key Biscayne FL 33149

House For Sale
$16,800,000

BTC: 262.50000000

ETH: 9,621.99312715

62 days
Waterfront
4 bds
4 ba
3,620 sqft

Overview

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

Location

Details

Type:
Residential
Parking:
Driveway / Guest
Year Built:
1968
Lot:
15000 Square Feet
Heating:
Other
Price/sqft:
$4,641
Cooling:
Central Air
HOA:
No Data

Valuation

Our model vs. what's actually selling nearby.
Estimate
$3,200,000
$1.4M – $13.2M
Confidence Low
List vs. estimate
$13.6M above estimate
List $16,800,000 · +425.0%
Our model says this listing is priced above recent comparable activity. Room to negotiate.
Price per sq ft
$4,640
+141.0% vs. city median $1,925
Based on
11 MLS comparables
+ 17 public-records sales within 0.5 mi
Median actual sale: $3.7M
Median of recent comparable listings. Sold comps use closing price, active listings use list price.

Highlights

Annual tax
$155,651
2025
Pool
In Ground
View
Bay, Garden
Waterfront
Ocean Access, Ocean Front
Garage
2 car garage
Pets
Allowed
All facts and features
  • Flooring

    • Other

    Heating

    • Other

    Cooling

    • Central Air

    Appliances

    • Dishwasher

    Other interior features

    • First Floor Entry

    • Entrance Foyer

    • Pantry

    • Split Bedroom

    • Vaulted Ceiling(s)

    • Walk-In Closet(s)

    • Garage Converted

    Bedrooms and bathrooms

    • Bedrooms: 4

    • Full bathrooms: 4

  • Parking

    • Driveway

    • Guest

    Property

    • Exterior Features: Other

    Lot

    • Lot: 15000 Square Feet

    Other Property Information

    • Parcel Number: 24-52-05-008-0320

    • Zoning: 2001

  • Type and style

    • Property Type: Residential

    • Property Sub Type: Single Family Residence

  • Other financial information

    • Annual tax amount: $155,651

  • Source details

    • MLS ID: A11990382

    Other facts

    • Construction Materials: Concrete Block Construction

    • Lot Features: Less Than 1/4 Acre Lot

    • Pool Features: In Ground

    • Direction Faces: East

    • Architectural Style: Attached / Other

    • Waterfront: Yes

    • Garage Spaces: 2

    • Attached Garage: Yes

    • Garage: Yes

    • Living Area: 3620

    • Water Source: Municipal Water

    • Subdivision Name: MASHTA ISLAND

Private inquiry
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Floor plans, HOA docs, off-market comparables, scheduling a private showing — one message, direct to the local specialist.

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The multiple listing information is provided by the Miami Association of REALTORS® from a copyrighted compilation of listings. The compilation of listings and each individual listing are ©2026-present Miami Association of REALTORS®. All Rights Reserved. The information provided is for consumers' personal, noncommercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. All properties are subject to prior sale or withdrawal. All information provided is deemed reliable but is not guaranteed accurate, and should be independently verified. Listing courtesy of: DLS International Realty