Home in 640 S Mashta Dr Key Biscayne for sale with MLS# A11990382

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

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640 S Mashta Dr, Key Biscayne, FL 33149

Price
Price:
$16,800,000.00
Original List Price:
$16,800,000.00
Property Status and Type
Listing Type:
For Sale
Status:
Active
Special Sale Conditions:
Listed As Is
Listing Category:
Residential
Property Type:
Single Family House
MLS Number:
A11990382
Description of Last Important Update:
New Listing
Last Major Update on:
April 2, 2026 6:08 pm
Rooms Distribution
Bedrooms:
4
Bathrooms Total:
4
Full Bath:
4
Room Type:
Converted Garage
Measures
Living Area:
3,620 Sqft
Built-Up Area:
4,990 Sqft
Lot Area:
15,000 Sqft
Lot Size Unit:
Square Feet
Lot Features:
Less Than Quarter Acre
Property Features
View from the Property:
Garden, Bay
Waterfront:
Yes
Waterfront Features:
Ocean Front
Frontage Length:
100
Swimming Pool Features:
Pool, In Ground
Appliances:
Dishwasher
Interior:
First Floor Entry, Breakfast Area, Dining Area, Pantry, Split Bedrooms, Walk-In Closet(s), Bedroom On Main Level, Vaulted Ceiling(s), Entrance Foyer, Living Dining Room, Dual Sinks
Exterior:
Other
Air Conditioning
Air Conditioning System:
Central Air
Heating System:
Other
Property Entrance Faces:
East
Water Access Description:
Dock Available
Construction
Year Built:
1968
Year Built Details:
Resale
Roof:
Barrel
Architectural Style:
Other
Construction Materials:
Block
Flooring:
Other
Road Frontage Type:
City Street
Taxes and Expenses
Tax Annual Amount:
$155,651.00
Tax Year:
2025
Property Tax Status:
Tax Reflects No Exemptions
Parking
Garage
Garage Spaces:
2
Covered Spaces:
2
Attached Garage
Parking Features:
Driveway, Garage, Garage Door Opener, Attached, Guest
Utilities
Sewer:
Public Sewer
Utilities Available:
Cable Available
Water Source:
Public
Community
Pets Allowed?:
Yes, Dogs Ok
Subdivision Name:
MASHTA ISLAND
Senior Community:
No
Restrictions:
Okay to Lease
Terms
Listing Terms Considered by Seller:
Cash, Conventional
Occupant Type:
Call Agent
Buyer Possession:
Close Of Escrow
Zoning and Legal
Tax Legal Description:
MASHTA ISLAND PB 60-93 LOT 9 BLK 3 LOT SIZE 100.000 X 150 OR 18642-3922 0599 1
Real Estate Folio Number (Parcel Number):
24-52-05-008-0320
Zoning Description:
2001
Public Schools Assigned
Elementary School:
Highland City Elem
High School:
Coral Gables
Middle Or Junior School:
Ponce De Leon
Listing History
Originally published on:
April 2, 2026 6:08 pm
Active on the market since:
April 2, 2026
Price change occurred on:
March 26, 2026 11:17 pm
Listing Status Last Changed On:
April 2, 2026 6:08 pm
Photos updated on:
April 5, 2026 9:10 pm
Last Modified:
April 5, 2026 9:10 pm
Additional Information
Housing Older Persons Act:
No HOPA
Flood Zone:
AE
Type of Association:
None
Rooms Description:
Garage Converted
Style:
WF/Pool/Ocean Access
Municipal Code:
24
Subdivision Number:
8
Courtesy of:
DLS International Realty
Attribution:
Not provided
Location
Street Name:
Mashta Dr
Street Number:
640
City:
Key Biscayne
State:
Florida
Zip Code:
33149
County:
Miami-Dade
Latitude:
N25° 41' 5.1''
Longitude:
W81° 49' 31.4''
Street Direction Prefix:
S
Property Map

Neighborhood Stats

Source: U.S. Census Bureau, ACS 5-Year Estimates

Median Household Income $171,982
Median Home Value $1,231,500
Median Rent $3,501/mo
Median Age 43
Population 14,628

Air Quality

Source: AirNow.gov · Miami

🌬️ Air Quality Index (AQI) 45 Good
☀️ O3 40 Good
🫁 PM2.5 45 Good

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Association of REALTORS®
Disclaimer: IDX listing information is presented by Rebonus Brokerage LLC for consumer informational purposes only. The information provided is for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data is deemed reliable but is not guaranteed by the MLS or the real estate broker. This page presents structured listing information sourced directly from the MLS via the RESO Web API feed. Rebonus prioritizes maximum field coverage and data completeness, displaying the most granular MLS-provided attributes available.