María Delgado Realtor® — Lifestyle International RealtyMaría Delgado|Realtor®Lifestyle International Realty
RentSell
AboutContact
|Talk to María
María Delgado Realtor®

María Delgado|Realtor®

Lifestyle International Realty

Residential properties, waterfront condos, and premium opportunities in South Florida. Personalized service, premium focus, and a clear process from start to finish.

Explore

BuyRentSellCommunitiesMarket reportsAboutContactFavoritesSearch

Areas

West Palm BeachMarket reports →
Palm BeachMarket reports →
JupiterMarket reports →
Boca RatonMarket reports →
Delray BeachMarket reports →
DavieSunriseCoral SpringsHollywoodPembroke PinesMiami

Contact

689-226-9466[email protected]
Schedule conversationWhatsApp

Flexible hours. Quick response for showings, questions, and similar options.

© 2026 María Delgado Realtor. All rights reserved.

Beaches Multiple Listing ServiceNational Association of RealtorsEqual Housing Opportunity

Listing data: BeachesMLS. Information not verified for authenticity or accuracy and not guaranteed; may not reflect all real estate activity in the market. © 2026 Beaches Multiple Listing Service, Inc. All rights reserved. Information Not Guaranteed and Must Be Confirmed by End User.

Lifestyle International Realty
Legal disclaimerFair HousingRequest valuation
  1. Home›
  2. Buy›
  3. Key Biscayne›
  4. 520 S Mashta Drive, Key Biscayne, FL 33149

Key Biscayne · FL

520 S Mashta Drive, Key Biscayne, FL 33149

Key Biscayne, FL 33149

Status: ActiveHouse · Single Family Residence3,085 sqftBuilt in: 1961DOM: 14Garage: 2

Price

$19,900,000

Price per sqft: $6,451/sqft

5

Bedrooms

4

Baths

3,085

SqFt

Active
520 S Mashta Drive, Key Biscayne, FL 33149

MLS® ID: A12071221

About this home in Key Biscayne

A rare offering, this turnkey oceanfront Single Family Residence with 5 bedrooms and 4 baths located in the Key Biscayne area, presenting 3,085 sq ft of comfortable living area. The interior showcases Bedroom Layout - Split. Underfoot, the home offers Tile. Climate is managed via Central Air cooling and Central heating. The property overlooks Bay and Direct Ocean. Waterfront features: Ocean Access, Seawall, and Bayfront. A private pool offers In Ground. The home sits on a 0.51-acre lot, with total building area of 4,177 sq ft. Set within Mashta Island A. The home features Block construction with a East-facing exposure under a Barrel and Spanish Tile roof. Currently active on the market; 68 days on market. The seller's current annual tax bill is roughly $201,741. Listed at $19,900,000 (~$6,451/sqft). Financing options include Cash and Conventional. No HOA fees apply.

5

Bedrooms

4

Baths

3,085

SqFt

House

Type

Explore more

Similar homes in Key Biscayne

100 Cape Florida Drive, Key Biscayne, FL 33149
Active · Key Biscayne

$19,800,000

100 Cape Florida Drive, Key Biscayne, FL 33149 · Key Biscayne · FL 33149

4 bd · 9 ba · 8,240 sqft

WaterfrontPoolFurnished
View details
120 Knollwood Drive, Key Biscayne, FL 33149↓ Price drop
Active · Key Biscayne

$19,450,000

120 Knollwood Drive, Key Biscayne, FL 33149 · Key Biscayne · FL 33149

6 bd · 7 ba · 6,208 sqft

WaterfrontPoolPet Friendly
View details
445 Grand Bay Drive PH-1A, Key Biscayne, FL 33149
Active · Key Biscayne

$18,900,000

445 Grand Bay Drive PH-1A, Key Biscayne, FL 33149 · Key Biscayne · FL 33149

5 bd · 6 ba · 8,435 sqft

WaterfrontPet Friendly
View details
631 N Mashta Drive, Key Biscayne, FL 33149
Active · Key Biscayne

$18,500,000

631 N Mashta Drive, Key Biscayne, FL 33149 · Key Biscayne · FL 33149

4 bd · 5 ba · 2,255 sqft

WaterfrontPoolPet Friendly
View details
799 Crandon Boulevard PH-8, Key Biscayne, FL 33149
Active · Key Biscayne

$18,500,000

799 Crandon Boulevard PH-8, Key Biscayne, FL 33149 · Key Biscayne · FL 33149

5 bd · 6 ba · 4,566 sqft

WaterfrontPoolPet Friendly
View details
350 Ocean Drive LPH2N, Key Biscayne, FL 33149↓ Price drop
Active · Key Biscayne

$17,900,000

350 Ocean Drive LPH2N, Key Biscayne, FL 33149 · Key Biscayne · FL 33149

5 bd · 6 ba · 4,764 sqft

WaterfrontPoolPet Friendly
View details

Listing courtesy of Coldwell Banker Realty. Information is deemed reliable but not guaranteed. © BeachesMLS.

Contact

Interested in this property?

Send me a message and I'll share details, availability and similar options.

CallEmail

Tour this home

In person or virtual — no commitment

▲350.9% above market
+350.9%

This listing: $6451/sqft · Area median: $1431/sqft

Based on 11 recent sales in ZIP 33149 (last 90 days)

Est. payment

$124,899/mo

Principal & interest
$100,625
Property taxes
$16,812
Home insurance
$7,463
HOA fees
N/A

Utilities not included

Calculations are estimates only and not a loan commitment. Taxes, insurance, rates and APR may vary. Final approval depends on lender review.

Tip

Save your favorite properties and compare them later. We can focus on the best options for you.

Explore more

  • → All homes for sale in Key Biscayne
  • → Homes for rent in Key Biscayne
  • → Key Biscayne market report
  • → Homes waterfront in Key Biscayne
  • → Homes with ocean view in Key Biscayne
  • → Homes with pool in Key Biscayne
  • → Complete guide to buying a home in the U.S.