MASHTA ISLAND A REPLAT OF
510 S Mashta Dr, Key Biscayne FL 33149
5 beds · 6.5 baths · 5,226 ft²
$19,000,000
Est. Payment $101,126/mo
5
Bedrooms
6.5
Bathrooms
5,226
Sq. Ft.
1981
Year Built
2
Garage
32
Days on Market
Description
Waterfront. Located on Mashta Island and island within an island in Key Biscayne. The minute you walk into the house the most breathtaking Biscayne Bay views welcomes you. Breathtaking sunsets.Oversized Lot:18,300-sq.ft. 2 story home with excellent floor plan,Large living room area w/double height ceilings, family room adjacent to Kitchen area. Large dining area w/direct water views & access to pool area. 2nd floor: Master suite & 3 additional bedrooms en suite Master suite w/balcony & large walk in closet .1st floor Guest suite.Water views from every room, dining & reception area.Gazebo by the water.Open kitchen. staff area.powder room.oversized pool w/Cabana room &cabana bath.Double access ( service access &main access) Lush garden offers total privacy . Enclosed two car garage.
Facts
- MLS#
- A11782312
- Subdivision
- MASHTA ISLAND A REPLAT OF
- Property Type
- Residential
- Property Sub Type
- Single Family Residence
- Year Built
- 1981
- Lot Size
- 18,300 ft²
- Sq. Ft.
- 5,226 ft²
- Sq. Mt.
- 486 m²
- Price per sq. ft.
- $3,636/ft²
- Price per sq. mt.
- $39,095/m²
- Stories
- —
- Garage
- 2 spaces
- Pool
- —
- Days on Market
- 32 days
- Listed
- Apr 11, 2025
- Last Updated
- Jul 8, 2025
- Price/Lot Sq.Ft.
- $1,038/ft²
Comparable homes
Same ZIP, similar price + bedrooms.
$18,900,000
5 bd · 6 ba · 8,435 sqft
445 Grand Bay Drive # 1A, Key Biscayne FL 33149
SOLD$19,300,000
6 bd · 8 ba · 10,820 sqft
500 S Mashta Dr, Key Biscayne FL 33149
SOLD$17,500,000
5 bd · 7 ba · 6,869 sqft
220 Harbor Dr, Key Biscayne FL 33149
$19,950,000
6 bd · 7 ba · 6,208 sqft
120 Knollwood Dr, Key Biscayne FL 33149
SOLD$21,900,000
5 bd · 8 ba · 7,929 sqft
360 Ocean Dr, Key Biscayne FL 33149
SOLD$15,850,000
5 bd · 7 ba · 5,760 sqft
1020 Mariner Dr, Key Biscayne FL 33149
$19,800,000
4 bd · 9 ba · 8,240 sqft
100 Cape Florida Dr, Key Biscayne FL 33149
SOLD$15,300,000
4 bd · 7 ba · 4,762 sqft
360 Ocean 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
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).
| 7/8/2025 | Sold | $19,000,000 |
| 4/11/2025 | Listed for sale | $19,000,000 |
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.
New World School Of The Arts9,10,11,12 · public · 0.3 mi
- Miami Tech at Mater Innovation Academy
9,10,11,12 · charter · 0.3 mi
- School For Advanced Studies-Wolfson
11,12 · public · 0.3 mi
- Law Enforcement Officers Memorial High School
9,10,11,12 · public · 0.6 mi
- Downtown Miami Charter School
KG,1,2,3,4,5 · charter · 0.6 mi
- Miami-Dade Online Academy- Virtual Instruction Program
KG,1,2,3,4,5,6,7,8,9,10,11,12 · public · 0.7 mi
- District Instructional Center (Dic)
KG,1,2,3,4,5,6,7,8,9,10,11,12 · public · 0.8 mi
- District Summer Center C
KG,1,2,3,4,5,6,7,8,9,10,11,12 · public · 0.8 mi
- District Summer Center D
KG,1,2,3,4,5,6,7,8,9,10,11,12 · public · 0.8 mi
- District Summer Center E
KG,1,2,3,4,5,6,7,8,9,10,11,12 · public · 0.8 mi
Data provided by GreatSchools.org © 2026. All rights reserved.Estimated Monthly Payment
$117,109/mo
Principal & Interest
$101,126
Property Tax
$15,833
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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