Skip to content

$18,500,000was $19,900,000

520 S Mashta Dr

5 bd · 4 ba · 3,085 sq ft

Asking price cut 7% on October 23, from $19,900,000.

75 days on marketSingle Family ResidenceWaterfront

Listing courtesy of Coldwell Banker Realty. 305-361-5722

From the MLS

Bedrooms
5
Bathrooms
4
Living area
3,085 sq ft
Asking per square foot
$5,997
Year built
1961
ZIP code
33149
MLS number
A12071221

What the listing says

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.

Description supplied by Coldwell Banker Realty.

Before you offer on this one

The asking price is the easy part. What decides a Miami condo purchase sits in the association’s budget, its reserve study, the last twelve months of board minutes and the milestone inspection — and in whether the declaration permits what you intend to do with it.

Stefania represents buyers. She does not hold this listing and has no stake in this one selling over any other, which is the position you want the person reading those documents to be in.

Copyright Southeast Florida Multiple Listing Service © 2026. Accuracy of listing information is not guaranteed. Listing information is provided for personal consumer, non-commercial use, solely to identify potential properties for potential purchase. All other use is strictly prohibited, is a violation of the terms of use, and may violate federal and state law.

Work with Stefania

Or tell her what you are actually looking for

One listing is a data point. If you say what the place is for, she will come back with the buildings that fit and the ones to avoid.

CallTextWhatsAppMessage