For sale

$16,800,000

640 S Mashta Dr, Key Biscayne, FL 33149

4beds

3,620sqft

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Single Family Residence

Built in 1968

0.34 Acres Lot

$-- Zestimate^®

$4,641/sqft

$-- HOA

What's special

Spacious driveway for guestsCovered parkingOpen-concept layoutModern kitchenLiving and dining areasPool and entertainment patio

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

94 days

1,034

21

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Facts & features

Interior

Bedrooms & bathrooms

Bedrooms: 4
Bathrooms: 4
Full bathrooms: 4

Heating

Other

Cooling

Central Air

Appliances

Included: Dishwasher

Features

Entrance Foyer, Pantry, Split Bedroom, Vaulted Ceiling(s), Walk-In Closet(s)
Flooring: Other

Interior area

Total structure area: 4,990
Total interior livable area: 3,620 sqft

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Property

Parking

Total spaces: 2
Parking features: Driveway, Guest, Garage Door Opener, Converted Garage
Attached garage spaces: 2
Has uncovered spaces: Yes

Features

Entry location: First Floor Entry,Foyer
Exterior features: Other
Has private pool: Yes
Pool features: In Ground
Has view: Yes
View description: Bay, Garden
Has water view: Yes
Water view: Bay
Waterfront features: Ocean Access, Ocean Front, WF/Pool/Ocean Access
Frontage length: 100

Lot

Size: 0.34 Acres
Features: Less Than 1/4 Acre Lot

Details

Parcel number: 2452050080320
Zoning: 2001

Construction

Type & style

Home type: SingleFamily
Architectural style: Other
Property subtype: Single Family Residence

Materials

Concrete Block Construction
Roof: Barrel Roof

Condition

Year built: 1968

Utilities & green energy

Sewer: Public Sewer
Water: Municipal Water

Community & HOA

Community

Subdivision: Mashta Island

HOA

Has HOA: No

Location

Region: Key Biscayne

Financial & listing details

Price per square foot: $4,641/sqft
Tax assessed value: $9,910,420
Annual tax amount: $155,651
Date on market: 4/2/2026
Listing terms: All Cash,Conventional

Estimated market value

Not available

Estimated sales range

Not available

Price history

Date	Event	Price
4/2/2026	Listed for sale	$16,800,000-13.8%$4,641/sqft
Source: MIAMI #A11990382 Report a problem
3/26/2026	Listing removed	$19,500,000$5,387/sqft
Source: MIAMI #A11896953 Report a problem
10/16/2025	Listed for sale	$19,500,000+57.6%$5,387/sqft
Source: MIAMI #A11896953 Report a problem
1/22/2025	Listing removed	$22,000$6/sqft
Source: MIAMI #A11671489 Report a problem
12/4/2024	Price change	$22,000-18.5%$6/sqft
Source: MIAMI #A11671489 Report a problem
10/16/2024	Sold	$12,375,000-6.6%$3,419/sqft
Source: MIAMI #A11611809 Report a problem
10/5/2024	Listed for rent	$27,000$7/sqft
Source: MIAMI #A11671489 Report a problem
9/20/2024	Pending sale	$13,250,000$3,660/sqft
Source: MIAMI #A11611809 Report a problem
8/5/2024	Price change	$13,250,000-11.7%$3,660/sqft
Source: MIAMI #A11611809 Report a problem
6/26/2024	Listed for sale	$15,000,000+867.7%$4,144/sqft
Source: MIAMI #A11611809 Report a problem
6/8/1999	Sold	$1,550,000$428/sqft
Source: Public Record Report a problem

Public tax history

Year	Property taxes	Tax assessment
2025	$155,731 +90.2%	$9,910,420 +92.2%
2024	$81,859 +1.3%	$5,157,166 +3%
2023	$80,770 +3.9%	$5,006,958 +3%
2022	$77,770 -0.4%	$4,861,125 +3%
2021	$78,116 +2.5%	$4,719,539 +1.4%
2020	$76,240 +2.1%	$4,654,378 +2.3%
2019	$74,698 +5.4%	$4,549,735 +1.9%
2018	$70,884	$4,464,902 +2.1%
2017	$70,884 +1.2%	$4,373,068 +2.1%
2016	$70,022 -1.7%	$4,283,123 +0.7%
2015	$71,257 -1.5%	$4,253,350 +0.8%
2014	$72,343 +3.1%	$4,219,594 +1.5%
2013	$70,177 +0%	$4,157,236 +1.7%
2012	$70,177 +2.3%	$4,087,745 +3%
2011	$68,606 -5.6%	$3,968,685 +1.5%
2010	$72,670 -18.9%	$3,910,035 -22.7%
2009	$89,639 -5.2%	$5,056,366 -7%
2007	$94,572 +51.4%	$5,434,044
2006	$62,445	--
2005	$62,445 +38.2%	--
2004	$45,184 +23.9%	--
2003	$36,465 +22%	--
2002	$29,894	--
2001	$29,894	--

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