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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. 631 N Mashta Drive, Key Biscayne, FL 33149

Key Biscayne · FL

631 N Mashta Drive, Key Biscayne, FL 33149

Key Biscayne, FL 33149

Status: ActiveHouse · Single Family Residence2,255 sqftBuilt in: 1958DOM: 82

Price

$18,500,000

Price per sqft: $8,204/sqft

4

Bedrooms

5

Baths

2,255

SqFt

Active
Aerial

MLS® ID: B26058354

About this home in Key Biscayne

A magnificent opportunity awaits with this meticulously updated oceanfront Single Family Residence, offering 4 bedrooms and 5 baths in the heart of one of Key Biscayne's established corridors, presenting 2,255 sq ft of comfortable living area. The home sits on a 0.34-acre lot, with total building area of 3,720 sq ft. Interior highlights include Entrance Foyer and Walk-In Closet(s). Flooring features Concrete, Laminate, and Tile. Comfort is handled by Central Air cooling and Central and Electric heating. The home features Brick and Concrete construction with a East-facing exposure under a Shingle roof. Views include Pool, Water, and Bay. Waterfront features: No Fixed Bridge, Ocean Access, and Navigable Water. The private pool includes In Ground and Equipment Included. Exterior details include Garden and Private Rooftop Terrace. Located in Mashta Island. No HOA fees apply. The seller's current annual tax bill is roughly $112,485. Offered at $18,500,000 (~$8,204/sqft). The seller accepts Cash and Conventional. Currently active on the market; 81 days on market.

4

Bedrooms

5

Baths

2,255

SqFt

House

Type

Explore more

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

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▲680.4% above market
+680.4%

This listing: $8204/sqft · Area median: $1051/sqft

Based on 18 recent sales in ZIP 33149 (last 90 days)

Est. payment

$109,857/mo

Principal & interest
$93,546
Property taxes
$9,374
Home insurance
$6,938
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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