MASHTA ISLAND,Mashta Island
640 S Mashta Dr, Key Biscayne FL 33149
5 beds · 5 baths · 3,620 ft²
5
Bedrooms
5
Bathrooms
3,620
Sq. Ft.
1968
Year Built
2
Garage
86
Days on Market
Description
Welcome to Heaven on Earth! Fish off your own dock and enjoy stunning sunset views from 100’ of direct Biscayne Bay waterfront in this iconic trophy property on the quiet side of Key Biscayne’s exclusive Mashta Island. Move in, renovate or build your dream home on this 15,000 SF lot. Enter into open-flow indoor-outdoor living, dining, and kitchen, with floor-to-ceiling sliding glass walls overlooking the sparkling screened pool, the wide bay and the boat dock—truly an entertainer’s delight! Sleep easy with five bedrooms and five full baths, including two water-facing principal suites and closets galore, plus impact windows-doors. Plenty of parking, with an oversized two-car garage plus covered parking and large guest driveway. One visit, and it will be clear—heaven on earth is right here!
Facts
- MLS#
- A11611809
- Subdivision
- MASHTA ISLAND,Mashta Island
- Property Type
- Residential
- Property Sub Type
- Single Family Residence
- Year Built
- 1968
- Lot Size
- 15,000 ft²
- Sq. Ft.
- 3,620 ft²
- Sq. Mt.
- 336 m²
- Price per sq. ft.
- $3,660/ft²
- Price per sq. mt.
- $39,435/m²
- Stories
- —
- Garage
- 2 spaces
- Pool
- —
- Days on Market
- 86 days
- Listed
- Jun 25, 2024
- Last Updated
- Oct 16, 2024
- Price/Lot Sq.Ft.
- $883/ft²
Comparable homes
Same ZIP, similar price + bedrooms.
SOLD$13,870,000
5 bd · 6 ba · 8,435 sqft
445 Grand Bay Dr # 1A, Key Biscayne FL 33149
$13,250,000
5 bd · 5 ba · 4,924 sqft
121 Knollwood Drive, Key Biscayne FL 33149
SOLD$11,995,000
5 bd · 5 ba · 5,532 sqft
290 Harbor Dr, Key Biscayne FL 33149
SOLD$13,500,000
6 bd · 6 ba · 6,985 sqft
890 HARBOR DRIVE, Key Biscayne FL 33149
$11,600,000
5 bd · 5 ba · 3,509 sqft
221 Knollwood Dr, Key Biscayne FL 33149
SOLD$14,900,000
5 bd · 6 ba · 7,004 sqft
260 Harbor Dr, Key Biscayne FL 33149
SOLD$12,000,000
5 bd · 9 ba · 8,240 sqft
100 Cape Florida Dr, Key Biscayne FL 33149
$12,980,000
6 bd · 8 ba · 6,405 sqft
420 Island Dr, Key Biscayne FL 33149
Market insights for Key Biscayne
Live MLS-derived activity. Forecast is a conservative rule-of-thumb estimate — not a guarantee.
Sellers market
May 2026
50
Median days to sold
+4.5%
1-year price forecast (est.)
Price & tax history
From the live MIAMI MLS feed. Older history requires the ListingHistory resource (not yet enabled).
| 10/16/2024 | Sold | $13,250,000 |
| 8/5/2024 | Price change | $13,250,000-11.7% |
| 6/25/2024 | Listed for sale | $15,000,000 |
History reflects fields present on the live MLS record. Full multi-year history requires the MIAMI ListingHistory resource (not yet enabled).
Location
GreatSchools Summary Ratings
Public + private K-12 schools within 5 miles of this listing.
Lively Stones For Jesus School Of The FutureKG,1,2,3,4,5,6,7,8,9,10,11,12 · private · 0.2 mi
- Lively Stones For Jesus School Of The Future
8 · private · 0.3 mi
- Lakeview Elementary School
PK,KG,1,2,3,4,5 · public · 0.3 mi
- Doctors Charter School Of Miami Shores
6,7,8,9,10,11,12 · charter · 0.7 mi
- Growing Minds Teaching Center
KG,1,2,3,4,5 · private · 0.8 mi
- Lively Stones for Jesus School of the Future
3,9,12 · private · 0.8 mi
- St James Catholic School
PK,KG,1,2,3,4,5,6,7,8 · private · 0.8 mi
- Trinity Christian School & Dc
PK,KG · private · 0.8 mi
- Van E. Blanton Elementary School
PK,KG,1,2,3,4,5 · public · 0.8 mi
- Hubert O. Sibley K-8 Center
PK,KG,1,2,3,4,5,6,7,8 · public · 0.8 mi
Data provided by GreatSchools.org © 2026. All rights reserved.Estimated Monthly Payment
$81,714/mo
Principal & Interest
$70,522
Property Tax
$11,042
Insurance
$150
HOA
$0
Estimates only. Actual payment depends on credit, lender, insurance carrier, and FL/Miami-Dade specifics. Contact Rangely for a precise quote.
The data relating to real estate for sale on this website comes in part from the Southeast Florida Multiple Listing Service. MLS Data is deemed reliable, but is not guaranteed accurate by MIAMI REALTORS®.
Accuracy of listing information is not guaranteed. Listing information is provided for personal consumer, non-commercial use, solely to identify potential properties for potential purchase. All other use is strictly prohibited and may be a violation of federal and state law.
Copyright Southeast Florida MLS a/k/a SEFMLS © 2026.
Updated within 24 hours
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