Virtual TourMap

For SaleSingle Family ResidenceActive

640 S Mashta Dr

Key Biscayne, FL 33149

$16,800,000

225 Days On Site

  • 4Beds
  • 4Baths4 full
  • 3,620Sq Ft
  • $4,641Per Sq Ft
  • 0.3444Acres
  • 1968Built
Subdivision
Mashta Island
County
Miami-Dade
MLS®
A11990382

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

Listing Snapshot

Price
$16,800,000
Days On Site
225 Days
Bedrooms
4
Inside Area (SqFt)
3,620 sqft
Total Baths
4
Full Baths
4
Partial Baths
0
Lot Size
0.3444 Acres
Year Built
1968
MLS® Number
A11990382
Status
Active
Property Tax
$155,651 (2025)
HOA/Condo/Coop Fees
N/A
Sq Ft Source
N/A

Property Details

General Features

13 items
Attached Garage
Yes
Direction Faces
East
Garage
Yes
Garage Spaces
2
Parking
Attached, Driveway, Garage, Guest, Garage Door Opener
Pets
Dogs OK, Yes
Property Sub Type
Single Family Residence
Sewer
Public Sewer
SqFt Total
4,990
Style
Other
Utilities
Cable Available
Water Source
Public
Zoning
2001

Interior Features

5 items
Appliances
Dishwasher
Cooling
Central Air
Flooring
Other
Heating
Other
Interior
Entrance Foyer, Pantry, Vaulted Ceiling(s), Walk-In Closet(s), Master Downstairs

Exterior Features

12 items
Construction Details
Block
Exterior
Other
Frontage
100
Lot Features
Waterfront
Pool Features
In Ground, Private
Private Pool
Yes
Road Frontage
City Street
Roof
Barrel
View
Bay, Garden
Waterfront
Yes
Waterfront Features
Ocean Front
Waterview
Bay, Garden

Community Features

2 items
MLS Area
52
Financing Terms Available
Cash, Conventional

Location

640 S Mashta Dr, Key Biscayne, FL 33149 · 52

Neighborhood & Commute

ZIP Code 33149

Median household income
$152,895
Income per person
$72,459
Households
5,812
Average household size
2.75
Median age
41.6

Source: Walk Score.

Disclosure: Community information and market data powered by Constellation Data Labs. Information is deemed reliable but not guaranteed.

Schools

Elementary School
Keybiscayne
Middle School
Ponce De Leon
High School
Coral Gables

Price & Status History

  1. Listing updated with changes from the MLS®
  2. Listing first seen on site
  3. Status changed to Active
  4. Price changed to $16,800,000

Friends & Family

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Listing courtesy of DLS International Realty (305) 244-7493

Stellar MLS

Listing information is provided by Participants of the Stellar MLS. IDX information is provided exclusively for personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information is deemed reliable but not guaranteed. Properties displayed may be listed or sold by various participants in the MLS Copyright 2026, Stellar MLS.

Last checked: 2026-11-14 01:04 AM EST

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