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© 2026 DockOnly™. All rights reserved.

DockOnly™ and Dock Score™ are trademarks of Blue Mar Real Estate Group Inc.

Blue Mar Real Estate Group

Blue Mar Real Estate Group Inc.

Licensed Florida Real Estate Broker

DBPR License CQ1018554

Listing data provided by Miami Realtors MLS via Bridge Data Output. Information deemed reliable but not guaranteed. Dock Score™ is a DockOnly.com rating and is not provided by or affiliated with the MLS or listing broker. NOAA chart data is public domain and for reference only — not for navigation. Full MLS Compliance

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© 2026 Miami Association of REALTORS®. IDX information provided exclusively for personal, non-commercial use. Listing data last updated every 30 minutes.

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+20

591 Mashta Dr

Key Biscayne, FL, 33149

Active Under Contract

$15,500,000

591 Mashta Dr

Key Biscayne, FL, 33149

Active Under Contract

$15,500,000

4

Bedrooms

5

Bathrooms

4,290 sqft

Living Area

1960

Year Built

Mortgage Calculator

Estimate your monthly payment for this waterfront property

20%

$3,100,000 down

%
Principal & Interest$80,426/mo
Property Tax (est. ~1.2%, varies by county)$15,500/mo
Home Insurance (est.)$250/mo
Total Monthly Payment$96,176
Loan Amount: $12,400,000Rate: 6.75%
Get Pre-Qualified

Estimated payments only. Actual rates and terms may vary.

Comparable Sales

$15,500,000Tour 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.

15,184

Lot Size (sqft)

72

Days on Market

Dock Score™

DockOnly
73
Good

What shaped this score

✓Ocean Access
✓Dock present
✓Bridge-free to bay
✓Fits boats up to 45ft

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

Dock & Water AccessMLS

Ocean AccessCanal Front📝 deep water

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.

Canal GeometryDockOnly

Canal Width

County parcel data
483ft at dock

Range 466–494 ft over the next 200 ft of canal

dock483 ft483474469

Width sampled every 10 ft from dock · perpendicular measurement

Will it turn around?

Up to 221 ft

Easy
handling

221–295 ft

Fits
with care

295–340 ft

Tight
(back-in)

Boats over 340 ft can't turn around here — back in/out only. Clear channel ≈ 443 ft once boats are docked both sides (FL rules cap each side ~20 ft). Wide-beam yachts need the upper end of each range.

Navigation RouteDockOnly

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

Description

BEAUTIFUL AND UNIQUE WATERFRONT HOME ON EXCLUSIVE MASHTA ISLAND, ON DESIRABLE NORTH MASHTA DR IN KEY BISCAYNE. ELEVATED AND VERY COMFORTABLE 4BR/4.5BA + MAID’S QUARTERS WITH APPROX. 4,290 SQ FT UNDER A/C, SITTING ON A LARGE AND PRIVATE 15,184 SQ FT LOT, IDEAL FOR ENJOYING WITH FAMILY AND FRIENDS. APPROX. 50 FT DOCK WHERE THE OWNERS HAVE DOCKED BOATS OF AROUND 78 FT, WITH DEEP WATER OF ABOUT 8 FT EVEN AT LOW TIDE – A RARE TRUE DEEP-WATER ACCESS ON THE ISLAND. NORTH-FACING CANAL KEEPS THE HOUSE AND OUTDOOR AREAS PLEASANT AND COOLER ALL YEAR ROUND. EASY TO SHOW. BRING YOUR QUALIFIED BUYERS AND BEST OFFERS.

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.

Listing courtesy of EXP Realty LLC

Last updated: 6/23/2026

© 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.

Dock Score™

DockOnly
73
Good

What shaped this score

✓Ocean Access
✓Dock present
✓Bridge-free to bay
✓Fits boats up to 45ft

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

FEMA Flood Zone AE
BFE: 10ft

Special Flood Hazard Area

View FEMA Flood Map →
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Nearby Schools

Assigned Public Schools

E

Key Biscayne K-8 Center

Grades PK-8 · Key Biscayne

M

Ponce de Leon MS

Grades 6-8 · Coral Gables

H

Coral Gables Senior High

Grades 9-12 · Coral Gables

Nearby Private Schools

St Agnes Academy1.1 mi
St Christophers - By-The-Sea Montessori School1.1 mi

School data from Miami-Dade County Open Data Hub. Verify attendance zones with the school district.