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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.

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  1. Home›
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  3. Key Biscayne›
  4. 640 S Mashta Drive, Key Biscayne, FL 33149

Key Biscayne · FL

640 S Mashta Drive, Key Biscayne, FL 33149

Key Biscayne, FL 33149

Status: ActiveHouse · Single Family Residence3,620 sqftBuilt in: 1968DOM: 170Garage: 2

Price

$16,800,000

Price per sqft: $4,641/sqft

4

Bedrooms

4

Baths

3,620

SqFt

Active
640 S Mashta Drive, Key Biscayne, FL 33149

MLS® ID: A11990382

About this home in Key Biscayne

Presenting a masterfully designed highly-coveted oceanfront Single Family Residence configured with 4 bedrooms and 4 baths nestled in Key Biscayne, FL, with 3,620 sq ft of well-proportioned living space. The home sits on a 0.34-acre lot with dimensions of 15000, with total building area of 4,990 sq ft. Views include Garden and Bay. Waterfront features: Ocean Front. The private pool includes In Ground. Interior highlights include Entrance Foyer, Pantry, Vaulted Ceiling(s), Walk-In Closet(s), and Bedroom Layout - Split. Comfort is handled by Central Air cooling. Set within Mashta Island. The home features Block construction with a East-facing exposure under a Barrel roof. Currently active on the market; pets allowed; 200 days on market. Annual property taxes for the current owner run about $155,651. Priced at $16,800,000 (~$4,641/sqft). Accepted financing: Cash and Conventional. No HOA fees apply.

4

Bedrooms

4

Baths

3,620

SqFt

House

Type

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Listing courtesy of DLS International Realty. Information is deemed reliable but not guaranteed. © BeachesMLS.

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▲224.4% above market
+224.4%

This listing: $4641/sqft · Area median: $1431/sqft

Based on 9 recent sales in ZIP 33149 (last 90 days)

Est. payment

$104,221/mo

Principal & interest
$84,950
Property taxes
$12,971
Home insurance
$6,300
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.

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