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669 S Mashta Dr, Key Biscayne FL 33149

House Active With Contract
$5,799,000

BTC: 90.22170362

ETH: 3,047.87032754

38 days
4 bds
3 ba
3,382 sqft

Overview

Located on the exclusive and highly sought-after Mashta Island, this exceptional property offers a rare opportunity to build your dream home or enjoy the existing beautifully refurbished residence. The home features new bathrooms, updated flooring, and tasteful modern finishes throughout. Designed for relaxed Florida living, the spacious covered terrace overlooks a stunning mosaic-tiled pool, creating the perfect setting for entertaining or enjoying the tropical surroundings. A unique opportunity in one of Key Biscayne's most desirable neighborhoods. Easy to show.

Location

Details

Type:
Residential
Parking:
Driveway
Year Built:
1960
Lot:
10000 Square Feet
Heating:
Heat Strip
Price/sqft:
$1,715
Cooling:
Central Air
HOA:
No Data

Valuation

Our model vs. what's actually selling nearby.
Estimate
$4,450,000
$2.3M – $5.2M
Confidence Low
List vs. estimate
$1.3M above estimate
List $5,799,000 · +30.3%
Our model says this listing is priced above recent comparable activity. Room to negotiate.
Price per sq ft
$1,714
-11.0% vs. city median $1,925
Based on
7 MLS comparables
+ 10 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
$22,013
2025
Pool
Above Ground
View
Garden
All facts and features
  • Flooring

    • Vinyl

    Heating

    • Heat Strip

    Cooling

    • Central Air

    Appliances

    • Dishwasher

    • Disposal

    • Dryer

    • Gas Range

    • Refrigerator

    • Self Cleaning Oven

    • Wall Oven

    • Washer

    Other interior features

    • Roman Tub

    • Split Bedroom

    • Volume Ceilings

    • Florida Room

    Bedrooms and bathrooms

    • Bedrooms: 4

    • Bathrooms: 1

    • Full bathrooms: 3

  • Parking

    • Driveway

    Property

    • Exterior Features: Outdoor Shower

    Lot

    • Lot: 10000 Square Feet

    Other Property Information

    • Parcel Number: 24-52-05-008-0180

    • Zoning: 2001

  • Type and style

    • Property Type: Residential

    • Property Sub Type: Single Family Residence

  • Other financial information

    • Annual tax amount: $22,013

  • Source details

    • MLS ID: A12033340

    Other facts

    • Construction Materials: CBS Construction

    • Lot Features: Less Than 1/4 Acre Lot

    • Patio And Porch Features: Patio

    • Pool Features: Above Ground

    • Window Features: Clear Impact Glass / Partial Accordian Shutters / Partial Impact Glass / Hurricane Shutters / Blinds / Impact Glass

    • Direction Faces: West

    • Architectural Style: Attached / Two Story

    • Living Area: 3382

    • Water Source: Municipal Water

    • Subdivision Name: MASHTA ISLAND

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: Coldwell Banker Realty