$16,800,000
640 S Mashta Drive
Key Biscayne, FL 33149
Explore the area: Key Biscayne homes for sale · Miami Dade County real estate
Price Check
How this price compares
- List price
- $16,800,000
- Price per sq ft
- $4,641
- Original price
- Unchanged
- Days on market
- 174
This 4-bedroom single-family home in Mashta Island is listed at $16,800,000, or $4,641 per square foot. It has been on the market for 174 days.
Estimated monthly payment
$88,291 /mo
Principal and interest only, based on $3,360,000 down (20%), a 6.875% 30-year fixed rate. Property taxes, homeowners insurance are not included.
Customize this estimateListing Snapshot
- Price
- $16,800,000
- Days on Site
- 174 Days
- Bedrooms
- 4
- Total Baths
- 4
- Full Baths
- 4
- Partial Baths
- 0
- Living Area
- 3,620 sqft
- Total Sq Ft
- 4,990 sqft
- Lot Size
- 0.34 Acres
- Year Built
- 1968
- Property Type
- Single Family
- MLS #
- A11990382
- Property Tax
- $155,651 (2025)
- Subdivision
- MASHTA ISLAND
- County
- Miami Dade
- Status
- Active
- Special Conditions
- Listed As Is
About This Property
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
Virtual TourGeneral Features
- Property Type
- Single Family
- Status
- Active
- Year Built
- 1968
- Property Condition
- Resale
- Garage Spaces
- 2
- Attached Garage
- Yes
- Parking
- Attached / Driveway / Garage / Garage Door Opener / Guest
- Direction Faces
- East
- Lot Size (Acres)
- 0.34
- Living Sq Ft
- 3,620
- Total Sq Ft
- 4,990
- Sewer
- Public Sewer
- Water Source
- Public
- Zoning
- 2001
Interior Features
- Appliances
- Dishwasher
- Cooling
- Central Air
- Heating
- Other
- Flooring
- Other
- Interior Features
- Breakfast Area / Bathtub / Dining Area / Dual Sinks / Entrance Foyer / Living Dining Room / Main Level Primary / Multiple En Suite Bathrooms / Pantry / Split Bedrooms / Soaking Tub / Separate Shower / Vaulted Ceilings / Walk In Closets
Exterior Features
- Construction
- Block
- Roof
- Barrel
- Exterior Features
- Other
- Architectural Style
- Other
- Private Pool
- Yes
- Pool Features
- In Ground
- Waterfront
- Yes
- Waterfront Features
- Ocean Front
- Frontage
- Waterfront
- Frontage Length
- 100.00 ft
- View
- Bay / Garden
Community & HOA
- Association Amenities
- Boat Dock
- Utilities
- Cable Available
- Pets Allowed
- Dogs Ok / Yes
- 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 Community
- Homes for Sale
- 2
- Median List Price
- $17,650,000
- Median $/Sq Ft
- $6,422
- Avg Days on Market
- 119
Frequently Asked Questions
- How do I schedule a tour of 640 S Mashta Drive, Key Biscayne, FL 33149?
- Use the Tour button on this listing to request a showing of 640 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 640 S Mashta Drive, Key Biscayne, FL 33149 still available?
- 640 S Mashta Drive, Key Biscayne, FL 33149 is currently listed as Active, and has been on the market 174 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 640 S Mashta Drive, Key Biscayne, FL 33149?
- With 20% down ($3,360,000) on the $16,800,000 list price and a 30-year fixed loan at an illustrative 6.875% rate, the estimated principal & interest for 640 S Mashta Drive, Key Biscayne, FL 33149 is about $88,291/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 640 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 640 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 640 S Mashta Drive, Key Biscayne, FL 33149?
- 640 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 640 S Mashta Drive, Key Biscayne, FL 33149?
- Often, yes. The right offer on 640 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 DLS International 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 June 23, 2026.
$16,800,000
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Listed by Brigitte De Langeron, DLS International Realty
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Recent Sales
Recently sold homes in Mashta Island
These are the last 2 recorded closings in Mashta Island, with the price each home actually sold for rather than what it was listed at. They closed at a median of $1,538 per square foot. The most recent closed on August 11, 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$5,200,000
Sold · August 11, 2026
669 S Mashta Drive
4 bed · 3.5 bath · 3,382 sqft · $1,538/sqft
$599,000 under the asking price
Sold$4,750,000
Sold · February 4, 2026
669 S Mashta Drive
3 bed · 3.5 bath · 3,382 sqft · $1,404/sqft
$200,000 under the asking price
See every recorded sale in Mashta Island or find out what your Mashta Island home is worth.
