Back to Search
640 S Mashta Dr photo 1
640 S Mashta Dr photo 2
640 S Mashta Dr photo 3
640 S Mashta Dr photo 4
640 S Mashta Dr photo 5
640 S Mashta Dr photo 6
640 S Mashta Dr photo 7
640 S Mashta Dr photo 8
640 S Mashta Dr photo 9
640 S Mashta Dr photo 10
640 S Mashta Dr photo 11
640 S Mashta Dr photo 12
640 S Mashta Dr photo 13
640 S Mashta Dr photo 14
640 S Mashta Dr photo 15
640 S Mashta Dr photo 16
640 S Mashta Dr photo 17
640 S Mashta Dr photo 18
640 S Mashta Dr photo 19
640 S Mashta Dr photo 20
640 S Mashta Dr photo 21
640 S Mashta Dr photo 22
640 S Mashta Dr photo 23
640 S Mashta Dr photo 24
640 S Mashta Dr photo 25
1 / 25

640 S Mashta Dr

Key Biscayne, FL, 33149

Active

$16,800,000

4

Bedrooms

4

Bathrooms

3,620 sqft

Living Area

1968

Year Built

15,000

Lot Size (sqft)

170

Days on Market

Dock Score™

DockOnly
86
Excellent

What shaped this score

✓Ocean Front
✓Dock present
✓Bridge-free to bay & ocean
✓Fits boats up to ~98ft (est.)
Est. waterfront~103 ft

DockOnly.com rating, not provided by the MLS or listing broker.

Dock & Water AccessMLS

Ocean AccessOcean Front

AI Aerial Imagery Detection

Dock DetectedSeawall DetectedDeep Water Indicators

Detected by AI from open-source aerial mapping imagery and may not reflect current conditions. This information was not provided by the MLS or listing broker. Always verify dock infrastructure with the listing agent.

Navigation RouteDockOnly

Data sources: SFWMD AHED waterway polygons · FHWA National Bridge Inventory 2024 · Not provided by the MLS or listing broker.

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

Schedule a Showing

See the property and tour the dock. A licensed waterfront specialist will arrange your private showing.

Select a date

Location

Key Biscayne, FL, 33149

No price history available for this property.

Displayed by Blue Mar Real Estate Group Inc., Licensed Florida Real Estate Broker (DBPR CQ1018554) · [email protected]

Listing courtesy of DLS International Realty via MIAMI REALTORS®

Last checked: yesterday

Listing updated: September 19, 2026

© 2026 Miami Association of REALTORS®, Inc. All rights reserved. The data relating to real estate for sale on this website comes in part from the Internet Data Exchange program of the Miami Association of REALTORS®. Information is deemed reliable but not guaranteed. All properties are subject to prior sale, change, or withdrawal.

IDX information is provided exclusively for consumers' personal, non-commercial use. It may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

FEMA Flood Zone AE
BFE: 10ft

Special Flood Hazard Area

View FEMA Flood Map →
Loading nearby marinas…
Loading nearby sandbars…

Mortgage Calculator

Estimate your monthly payment for this waterfront property

20%

$3,360,000 down

%
Principal & Interest$87,172/mo
Property Tax (est. ~1.2%, varies by county)$16,800/mo
Home Insurance (est.)$250/mo
Total Monthly Payment$104,222
Loan Amount: $13,440,000Rate: 6.75%
Get Pre-Qualified

Estimated payments only. Actual rates and terms may vary.

$16,800,000Tour the dockSchedule a Showing
Navigation note: Navigation routes show the shortest mapped path to open water. A vessel taller than the binding bridge clearance may still reach open water via a longer alternate route that we don't currently map. Verify navigability with a local captain or surveyor before relying on it.