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591 N Mashta Dr, Key Biscayne FL 33149

House Active With Contract
$15,500,000

BTC: 252.44299674

ETH: 8,877.43413517

-$1M (2026/03/20)
150 days
Waterfront
4 bds
4 ba
4,290 sqft

Overview

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.

Location

Details

Type:
Residential
Parking:
Other
Year Built:
1960
Lot:
15184 Square Feet
Heating:
Central
Price/sqft:
$3,613
Cooling:
Central Air
HOA:
No Data

Valuation

Our model vs. what's actually selling nearby.
Estimate
$1,897,500
$842K – $4.1M
Confidence Low
List vs. estimate
$13.6M above estimate
List $15,500,000 · +716.9%
Our model says this listing is priced above recent comparable activity. Room to negotiate.
Price per sq ft
$3,613
+81.8% vs. city median $1,987
Based on
10 MLS comparables
+ 21 public-records sales within 0.5 mi
Median actual sale: $3.6M
Median of recent comparable listings. Sold comps use closing price, active listings use list price.

Highlights

Annual tax
$112,793
2025
Pool
In Ground
View
Canal, Water
Waterfront
Ocean Access, Canal Front
Garage
2 car garage
All facts and features
  • Flooring

    • Other

    • Wood

    Heating

    • Central

    Cooling

    • Central Air

    Appliances

    • Trash Compactor

    • Dishwasher

    • Disposal

    • Dryer

    • Electric Water Heater

    • Microwave

    • Gas Range

    Other interior features

    • First Floor Entry

    • No Additional Rooms

    Bedrooms and bathrooms

    • Bedrooms: 4

    • Bathrooms: 1

    • Full bathrooms: 4

  • Parking

    • Other

    Lot

    • Lot: 15184 Square Feet

    Other Property Information

    • Parcel Number: 24-52-05-009-0040

    • Zoning: 2001

  • Type and style

    • Property Type: Residential

    • Property Sub Type: Single Family Residence

  • Other financial information

    • Annual tax amount: $112,793

  • Source details

    • MLS ID: A11924175

    Other facts

    • Construction Materials: Concrete Block With Brick

    • Lot Features: 1/4 To Less Than 1/2 Acre Lot

    • Patio And Porch Features: Deck

    • Pool Features: In Ground

    • Direction Faces: North

    • Architectural Style: Detached / One Story

    • Waterfront: Yes

    • Garage Spaces: 2

    • Garage: Yes

    • Living Area: 4290

    • Water Source: Municipal Water

    • Subdivision Name: MASHTA ISLAND A REPLAT OF

Private inquiry
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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: EXP Realty LLC