MASHTA ISLAND
520 S MASHTA DR, Key Biscayne FL 33149
4 beds · 4 baths · 3,085 ft²
$17,200,000
Est. Payment $91,546/mo
4
Bedrooms
4
Bathrooms
3,085
Sq. Ft.
1961
Year Built
2
Garage
26
Days on Market
Description
CROWN JEWEL OF KEY BISCAYNE! Captivating wide open Bay vistas on rare sought after S. Mashta Drive. Situated among luxurious multi-million dollar mansions, it offers unparalleled privacy and security. Highlight of this property is its expansive 22,140 sq.ft. WF lot providing breathtaking views of the Bay, from private yachts passing by to mesmerizing sunsets. Enjoy 3,085 sq.ft. recently renovated “Hamptons like” villa as you imagine your dream home. Home can also be easily leased to generate income. Excellent school system, Int'l boutiques, and restaurants. Nestled between two exquisite parks boasting pristine white sandy beaches, golf & tennis centers. Twenty minutes from vibrant areas of Brickell Ave & Coconut Grove. 25 minutes from heart of S. Beach and Miami Int’l. airport.
Facts
- MLS#
- A11502495
- Subdivision
- MASHTA ISLAND
- Property Type
- Residential
- Property Sub Type
- Single Family Residence
- Year Built
- 1961
- Lot Size
- 22,140 ft²
- Sq. Ft.
- 3,085 ft²
- Sq. Mt.
- 287 m²
- Price per sq. ft.
- $5,575/ft²
- Price per sq. mt.
- $59,930/m²
- Stories
- —
- Garage
- 2 spaces
- Pool
- —
- Days on Market
- 26 days
- Listed
- Dec 20, 2023
- Last Updated
- Feb 26, 2024
- Price/Lot Sq.Ft.
- $777/ft²
Comparable homes
Same ZIP, similar price + bedrooms.
$16,800,000
4 bd · 4 ba · 3,620 sqft
640 S Mashta Dr, Key Biscayne FL 33149
$15,500,000
4 bd · 5 ba · 4,290 sqft
591 N Mashta Dr, Key Biscayne FL 33149
$19,800,000
4 bd · 9 ba · 8,240 sqft
100 Cape Florida Dr, Key Biscayne FL 33149
$18,900,000
5 bd · 6 ba · 8,435 sqft
445 Grand Bay Drive # 1A, Key Biscayne FL 33149
SOLD$14,900,000
5 bd · 6 ba · 7,004 sqft
260 Harbor Dr, Key Biscayne FL 33149
SOLD$13,870,000
5 bd · 6 ba · 8,435 sqft
445 Grand Bay Dr # 1A, 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
77
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).
| 2/26/2024 | Sold | $17,200,000 |
| 12/20/2023 | Listed for sale | $17,200,000 |
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.
Pee Wee Learning AcademyPK,TK,KG,1,2,3,4,5,6,7,8 · private · 2.5 mi
- Frances K. Sweet Elementary School
PK,KG,1,2,3,4,5 · public · 2.6 mi
- St. Andrew's Episcopal Academy
PK,KG,1,2,3,4,5,6,7,8,9,10,11,12 · private · 2.8 mi
- Mills Academic Learning Center
PK,KG,1,2,3,4,5,6 · private · 2.9 mi
- East Coast Migrant Head Start
PK,KG · private · 3.1 mi
- Lincoln Park Academy
6,7,8,9,10,11,12 · public · 3.1 mi
- Fort Pierce Magnet School Of The Arts
KG,1,2,3,4,5,6,7,8 · public · 3.4 mi
- Camp Holiday Children's Center
PK,KG · private · 3.5 mi
- Chester A. Moore Elementary School
PK,KG,1,2,3,4,5,6,7,8 · public · 3.8 mi
- Garden Terrace Head Start
PK,KG · private · 3.9 mi
Data provided by GreatSchools.org © 2026. All rights reserved.Estimated Monthly Payment
$106,029/mo
Principal & Interest
$91,546
Property Tax
$14,333
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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