How much is 640 S Mashta Drive?

640 S Mashta Drive is listed at $16,800,000, which is about $4,641 per square foot. The listing page shows comparable active listings and recent closed sales nearby so you can judge the asking price against what buyers have actually paid.

What are the property taxes on 640 S Mashta Drive?

The listing reports annual property taxes of $155,651 for 2025. Taxes are reassessed at the sale price after a purchase, so a new owner's bill can differ from the current owner's; use the mortgage calculator on this page for an estimate.

When was 640 S Mashta Drive built?

640 S Mashta Drive was built in 1968 and the listing describes its condition as resale. Age matters for insurance and financing in Florida: ask about the roof, the electrical panel and, for a condo built before the current code, the building's structural reserve study.

How long has 640 S Mashta Drive been on the market?

640 S Mashta Drive has been listed for 174 days. Days on market and price changes are the first signals of how much room there is to negotiate.

Is 640 S Mashta Drive waterfront?

Yes. The listing describes the water as ocean front. For a home with dockage, confirm the water depth at low tide, the seawall condition and whether the route to the inlet passes under any fixed bridges before you offer.

Which schools serve 640 S Mashta Drive?

The MLS lists Key Biscayne K-8 (elementary), Ponce De Leon (middle), Coral Gables (high). School assignments are set by the district and can change; verify them with the school board before you rely on them.

How do I see 640 S Mashta Drive?

Request a showing from this page or call BreakThru Realty and a licensed agent will arrange a private tour, in person or by video, and answer anything the listing leaves out.

640 S Mashta Drive, Key Biscayne, FL 33149

$16,800,000 · Active

4 beds
4 baths
3,620 sq ft
Single Family Residence
Built 1968
Lot 14,810.4 sq ft
MLS# A11990382
Mashta Island

Photo 1 at 640 S Mashta Drive, Key Biscayne

Photo 2 at 640 S Mashta Drive, Key Biscayne

Photo 3 at 640 S Mashta Drive, Key Biscayne

Photo 4 at 640 S Mashta Drive, Key Biscayne

Photo 5 at 640 S Mashta Drive, Key Biscayne

Photo 6 at 640 S Mashta Drive, Key Biscayne

Photo 7 at 640 S Mashta Drive, Key Biscayne

Photo 8 at 640 S Mashta Drive, Key Biscayne

About this home

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

Features

Entrance Foyer
Pantry
Vaulted Ceiling(s)
Walk-In Closet(s)
Bedroom Layout - Split
Other
Ocean Front
In Ground

Schools

Elementary: Key Biscayne K-8
Middle: Ponce De Leon
High: Coral Gables

Presented by

BreakThru Realty · (786) 914-1017

Courtesy of

DLS International Realty · Listing agent: Brigitte De Langeron

Schedule a showing

Call or text BreakThru Realty at (786) 914-1017 or email sales@breakthrurealty.com to see 640 S Mashta Drive.

Questions About 640 S Mashta Drive

How much is 640 S Mashta Drive?: 640 S Mashta Drive is listed at $16,800,000, which is about $4,641 per square foot. The listing page shows comparable active listings and recent closed sales nearby so you can judge the asking price against what buyers have actually paid.
What are the property taxes on 640 S Mashta Drive?: The listing reports annual property taxes of $155,651 for 2025. Taxes are reassessed at the sale price after a purchase, so a new owner's bill can differ from the current owner's; use the mortgage calculator on this page for an estimate.
When was 640 S Mashta Drive built?: 640 S Mashta Drive was built in 1968 and the listing describes its condition as resale. Age matters for insurance and financing in Florida: ask about the roof, the electrical panel and, for a condo built before the current code, the building's structural reserve study.
How long has 640 S Mashta Drive been on the market?: 640 S Mashta Drive has been listed for 174 days. Days on market and price changes are the first signals of how much room there is to negotiate.
Is 640 S Mashta Drive waterfront?: Yes. The listing describes the water as ocean front. For a home with dockage, confirm the water depth at low tide, the seawall condition and whether the route to the inlet passes under any fixed bridges before you offer.
Which schools serve 640 S Mashta Drive?: The MLS lists Key Biscayne K-8 (elementary), Ponce De Leon (middle), Coral Gables (high). School assignments are set by the district and can change; verify them with the school board before you rely on them.
How do I see 640 S Mashta Drive?: Request a showing from this page or call BreakThru Realty and a licensed agent will arrange a private tour, in person or by video, and answer anything the listing leaves out.

Explore

Recently Sold Nearby

591 N Mashta Drive, Key Biscayne, FL 33149 · Sold $14,000,000 · 4 bd · 5 ba · 4,290 sq ft
111 Reef Lane, Key Biscayne, FL 33149 · Sold $10,850,000 · 7 bd · 6 ba · 5,008 sq ft

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Nearby Cities

Key Biscayne Neighborhoods

Nearby ZIP Codes

A comparable home, 591 N Mashta Drive, Key Biscayne, FL 33149, sold for $14,000,000 in August 2026. Key Biscayne neighborhoods include Cape Florida and Key Colony. Nearby ZIP codes include 33133 and 33131. This property also neighbors Coconut Grove, Brickell, and Miami. Compare it with the Key Biscayne housing market report.