$19,900,000
520 S Mashta Drive
Key Biscayne, FL 33149
MASHTA ISLAND A REPLAT OF
Explore the area: Key Biscayne homes for sale · Miami Dade County real estate
Price Check
How this price compares
- List price
- $19,900,000
- Price per sq ft
- $6,451
- Original price
- Unchanged
- Days on market
- 42
This 5-bedroom single-family home in ZIP 33149 is listed at $19,900,000, or $6,451 per square foot. It has been on the market for 42 days.
Estimated monthly payment
$104,583 /mo
Principal and interest only, based on $3,980,000 down (20%), a 6.875% 30-year fixed rate. Property taxes, homeowners insurance are not included.
Customize this estimateListing Snapshot
- Price
- $19,900,000
- Days on Site
- 42 Days
- Bedrooms
- 5
- Total Baths
- 4
- Full Baths
- 4
- Partial Baths
- 0
- Living Area
- 3,085 sqft
- Total Sq Ft
- 4,177 sqft
- Lot Size
- 0.51 Acres
- Year Built
- 1961
- Property Type
- Single Family
- MLS #
- A12071221
- Property Tax
- $201,741 (2026)
- Subdivision
- MASHTA ISLAND A REPLAT OF
- County
- Miami Dade
- Status
- Active
- Special Conditions
- Listed As Is
About This Property
Seize a rare opportunity to create a landmark waterfront estate on one of the largest residential lots in Key Biscayne’s exclusive Mashta Island enclave. Spanning an extraordinary 22,140 square feet, this exceptional property offers 138 feet of pristine water frontage and sweeping open water views, providing an unparalleled setting for a world class residence.Plans by renowned architect, Pablo Corazzini of Vitalini Corazzini Architects, are available to the buyer, offering a thoughtfully conceived vision that takes full advantage of the property’s remarkable scale, premier waterfront setting, and spectacular sunsets. The proposed design creates an extraordinary canvas for sophisticated indoor-outdoor living and entertaining, should the buyer choose to pursue the concept.With its exceptional lot size, expansive water frontage, and coveted Mashta Island address, this is a truly irreplaceable opportunity to create a legacy estate in one of South Florida’s most prestigious waterfront communities.
Virtual TourGeneral Features
- Property Type
- Single Family
- Status
- Active
- Year Built
- 1961
- Property Condition
- Resale
- Number of Stories
- 1
- Levels
- One
- Garage Spaces
- 2
- Parking
- Driveway
- Direction Faces
- East
- Lot Size (Acres)
- 0.51
- Living Sq Ft
- 3,085
- Total Sq Ft
- 4,177
- Sewer
- Public Sewer
- Water Source
- Public
- Zoning
- 2001
Interior Features
- Cooling
- Central Air
- Heating
- Central
- Flooring
- Tile
- Interior Features
- Main Level Primary / Split Bedrooms
Exterior Features
- Construction
- Block
- Roof
- Barrel / Spanish Tile
- Private Pool
- Yes
- Pool Features
- In Ground
- Waterfront
- Yes
- Waterfront Features
- Bayfront / Ocean Access / Seawall
- Frontage
- Waterfront
- Frontage Length
- 138.00 ft
- View
- Bay / Ocean
Community & HOA
- Association Amenities
- Other
- Financing Terms
- Cash / Conventional
- Restrictions
- Ok To Lease
- MLS Area
- 2520
Schools
- Elementary School
- Key Biscayne K-8
- Middle School
- Ponce De Leon
- High School
- Coral Gables
About the Area
Browse Key Biscayne homes for sale across every neighborhood and price point in Miami-Dade. Available homes span single-family, townhome, and condo segments throughout the city. Key Biscayne includes gated golf communities, 55+ active adult neighborhoods, waterfront estates, and newer master-planned subdivisions. HOA fees vary by community type, from modest maintenance fees in non-gated subdivisions to higher dues in full-amenity country clubs. The city sits within Miami-Dade, offering access to South Florida beaches, major employment centers, and healthcare hubs. For current Miami-Dade market data, see Florida Realtors' monthly statistics. Browse the latest Key Biscayne listings below. Then connect with a Pure Equity agent to schedule a private showing.
- Homes for Sale
- 149
- Median List Price
- $2,600,000
- Median $/Sq Ft
- $1,158
- Avg Days on Market
- 129
Frequently Asked Questions
- How do I schedule a tour of 520 S Mashta Drive, Key Biscayne, FL 33149?
- Use the Tour button on this listing to request a showing of 520 S Mashta Drive, Key Biscayne, FL 33149. Pick a day and time and choose an in-person or video-chat tour, and a Pure Equity agent will confirm your visit, often the same day.
- Is 520 S Mashta Drive, Key Biscayne, FL 33149 still available?
- 520 S Mashta Drive, Key Biscayne, FL 33149 is currently listed as Active, and has been on the market 42 days. Status updates directly from the MLS as homes go under contract, so ask us to confirm availability before you plan a visit.
- How much is the monthly payment for 520 S Mashta Drive, Key Biscayne, FL 33149?
- With 20% down ($3,980,000) on the $19,900,000 list price and a 30-year fixed loan at an illustrative 6.875% rate, the estimated principal & interest for 520 S Mashta Drive, Key Biscayne, FL 33149 is about $104,583/mo, before property taxes, insurance. Use the payment estimate on this page to adjust the down payment and rate.
- How do I get pre-approved to buy 520 S Mashta Drive, Key Biscayne, FL 33149?
- Getting pre-approved shows sellers you're a serious buyer and clarifies your true budget before you offer on 520 S Mashta Drive, Key Biscayne, FL 33149. Contact Pure Equity and we'll connect you with a trusted local lender to review your financing options, no obligation.
- What schools serve 520 S Mashta Drive, Key Biscayne, FL 33149?
- 520 S Mashta Drive, Key Biscayne, FL 33149 is zoned for Key Biscayne K-8 (elementary), Ponce De Leon (middle), Coral Gables (high). School assignments and boundaries can change year to year, so confirm current zoning with the local school district before you buy.
- Can I negotiate the price of 520 S Mashta Drive, Key Biscayne, FL 33149?
- Often, yes. The right offer on 520 S Mashta Drive, Key Biscayne, FL 33149 depends on how it's priced against comparable single family sales in Key Biscayne, how long it's been listed, and how motivated the seller is. Pure Equity will run the comps and help you craft a competitive, well-supported offer.
Listing courtesy of Coldwell Banker Realty
Listing information is provided by BeachesMLS, Inc.and is deemed reliable but not guaranteed accurate by the MLS or Pure Equity. Information is for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties. © 2026 BeachesMLS, Inc. Last updated August 30, 2026.
$19,900,000
Interested in This Property?
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Listed by Maureen Jauregui, Coldwell Banker Realty
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Recent Sales
Recently sold homes in ZIP 33149
These are the last 6 recorded closings in ZIP 33149, with the price each home actually sold for rather than what it was listed at. They closed at a median of $1,880 per square foot. The most recent closed on October 5, 2026. Closed sales are what an appraiser and a buyer's agent will look at, so they are the starting point for pricing a home here.
Sold$7,767,500
Sold · October 5, 2026
165 Hampton Lane
6 bed · 8.5 bath · 3,842 sqft · $2,022/sqft
$482,500 under the asking price
Sold$1,000,000
Sold · October 1, 2026
455 Grand Bay Drive 717
0 bed · 1 bath · 532 sqft · $1,880/sqft
$88,000 under the asking price
Sold$1,660,000
Sold · September 30, 2026
613 Ocean Drive 5D
2 bed · 2 bath · 1,496 sqft · $1,110/sqft
$110,000 under the asking price
Sold$2,800,000
Sold · September 28, 2026
738 Fernwood Road
3 bed · 2 bath · 1,312 sqft · $2,134/sqft
$75,000 under the asking price
Sold$1,115,000
Sold · September 25, 2026
181 Crandon Boulevard 308
3 bed · 2 bath · 1,720 sqft · $648/sqft
$35,000 under the asking price
Sold$1,600,000
Sold · September 25, 2026
425 Grapetree Drive 211
2 bed · 3 bath · 1,404 sqft · $1,140/sqft
$145,000 under the asking price
See every recorded sale in ZIP 33149 or find out what your ZIP 33149 home is worth.
