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Listings courtesy of Coldwell Banker Realty.

Active - House for sale

520 S Mashta Dr, Key Biscayne FL 33149

5 bds|4 bth|3,085 sqft

Facts & features

House Property type
21 days on Beycome
1961 Year built
$6,451 Price/Sqft.
2 car garage Parking

Why you’ll love it

  • Waterfront
  • Water view

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.

Translating description...

Listed by: Maureen Jauregui • 305-798-3124 • Coldwell Banker Realty

Co-listed by: Emma Jauregui • 305-798-3124 • Coldwell Banker Realty

Source: Miami MLS, MLS#: A12071221 Miami MLS logo

Based on information as of Sep 01, 2026 at 08:26am EDT.

Come see by yourself

Affordability

$12,935,000$26,865,000
1%20%
0%90%
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Estimated monthly payment

$117,437/mo

  • Mortgage$100,625
  • Property tax$16,812
  • HOA fee
  • Homeowners insurance
Due at closing$15,820,500
Down payment held in escrow$3,980,000
Closing costs$298,500
beycome credit Est.$398,000

Beycome estimates only. Actual amounts and terms vary by lender and location.

Discover the neighborhood

Travel times

About Mashta Island A Replat Of

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AI-generated overview for informational purposes only.
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Flood & climate risk

FEMA Flood Zone AE

In a FEMA Special Flood Hazard Area — flood insurance is typically required with a federally-backed mortgage.

More details

Base flood elevation: 10 ft. Source: FEMA National Flood Hazard Layer. Confirm on the FEMA Flood Map.

Disclaimer

No guarantee, warranty or representation of any kind is made regarding the completeness or accuracy of descriptions or measurements. Photos may be virtually staged or digitally enhanced and may not reflect actual property conditions. Offers of compensation are subject to change at the discretion of the seller. No financial or legal advice provided. Copyright ©2026. Based on information as of Sep 01, 2026 at 08:26am EDT.

$19,900,000 Listed price

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$398,000 Credit back

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